WO2022083116A1 - Dual-wavelength resonant cavity based on volume bragg grating - Google Patents

Dual-wavelength resonant cavity based on volume bragg grating Download PDF

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Publication number
WO2022083116A1
WO2022083116A1 PCT/CN2021/094278 CN2021094278W WO2022083116A1 WO 2022083116 A1 WO2022083116 A1 WO 2022083116A1 CN 2021094278 W CN2021094278 W CN 2021094278W WO 2022083116 A1 WO2022083116 A1 WO 2022083116A1
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volume bragg
bragg grating
grating
volume
light
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PCT/CN2021/094278
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French (fr)
Chinese (zh)
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张翔
袁孝
张念
高帆
熊宝星
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苏州大学
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/08086—Multiple-wavelength emission
    • H01S3/0809—Two-wavelenghth emission
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/163—Solid materials characterised by a crystal matrix
    • H01S3/164—Solid materials characterised by a crystal matrix garnet
    • H01S3/1643—YAG

Definitions

  • the invention relates to the field of laser technology, in particular to a dual-wavelength resonant cavity based on a volume Bragg grating.
  • a dual-wavelength laser is a device that uses a solid as a working substance to generate laser light. It includes three main components: a resonator, a pump source and a working substance.
  • the resonant cavity is a cavity that provides feedback for the back and forth oscillation of the light wave. It is usually composed of two mirrors that are perpendicular to the axis of the working material. The light will not escape from the cavity after going back and forth in the stable resonant cavity for many times.
  • dual-wavelength lasers are solid-state lasers.
  • ordinary Q-switched dual-wavelength lasers use a single laser gain medium to obtain dual-wavelength lasers from the output mirror and output simultaneously.
  • the two wavelengths There is fierce gain competition between the transition lines of the laser, which affects the stability of the laser output.
  • the purpose of the present invention is to provide a dual-wavelength resonant cavity based on volume Bragg grating, which uses the volume Bragg grating as an output mirror (spectral selection element) to coordinate the gain competition between the two laser oscillation wavelengths in the resonant cavity, so as to achieve a stable and balanced resonator. Dual wavelength laser output.
  • the present invention provides the following scheme:
  • a dual-wavelength resonant cavity based on volume Bragg gratings comprising: a first pair of volume Bragg gratings and a second pair of volume Bragg gratings; the first pair of volume Bragg gratings includes a first volume Bragg grating and a third volume Bragg grating, so The second pair of volume Bragg gratings includes a second volume Bragg grating and a fourth volume Bragg grating;
  • Both the first volume Bragg grating and the second volume Bragg grating are located on the outgoing optical path of the pump light;
  • the first volume Bragg grating and the second volume Bragg grating are arranged at intervals, and the pump light is located between the plane where the first volume Bragg grating is located and the plane where the second volume Bragg grating is located;
  • the third volume Bragg grating is located on the diffraction light path of the first volume Bragg grating; the angle between the plane where the third volume Bragg grating is located and the plane where the first volume Bragg grating is located is a first preset angle , and the reflected light path of the third volume Bragg grating coincides with the diffracted light path of the first volume Bragg grating;
  • the fourth volume Bragg grating is located on the diffraction light path of the second volume Bragg grating; the included angle between the plane where the fourth volume Bragg grating is located and the plane where the second volume Bragg grating is located is a second preset angle , and the reflected light path of the fourth volume Bragg grating coincides with the diffracted light path of the second volume Bragg grating;
  • the first volume Bragg grating is used for outputting light that meets a first preset transmission condition of the first volume Bragg grating, and diffracting light that does not meet the first preset transmission condition;
  • the second volume Bragg grating is configured to output light that meets the second preset transmission condition of the second volume Bragg grating, and diffract light that does not meet the second preset transmission condition;
  • the third volume Bragg grating is used for reflecting light that meets the third preset reflection condition of the third volume Bragg grating
  • the fourth volume Bragg grating is used for reflecting light that meets a fourth preset reflection condition of the fourth volume Bragg grating.
  • the first volume Bragg grating and the second volume Bragg grating are both transmissive volume Bragg gratings
  • the third volume Bragg grating and the fourth volume Bragg grating are both reflective volume Bragg gratings.
  • grating periods of the first volume Bragg grating and the second volume Bragg grating are the same.
  • grating periods of the third volume Bragg grating and the fourth volume Bragg grating are the same.
  • the grating thicknesses of the first volume Bragg grating and the second volume Bragg grating are the same.
  • grating thicknesses of the third volume Bragg grating and the fourth volume Bragg grating are the same.
  • the distance between the third volume Bragg grating and the first volume Bragg grating is equal to the distance between the fourth volume Bragg grating and the second volume Bragg grating.
  • the present invention discloses the following technical effects:
  • the invention provides a dual-wavelength resonant cavity based on a volume Bragg grating.
  • the dual-wavelength resonant cavity includes: a first pair of volume Bragg gratings and a second pair of volume Bragg gratings; the first pair of volume Bragg gratings includes a first volume Bragg grating and a third volume Bragg grating, and the second pair of volume Bragg gratings includes a second volume Bragg grating Bragg grating and fourth volume Bragg grating; both the first volume Bragg grating and the second volume Bragg grating are located on the outgoing light path of the pump light; the first volume Bragg grating and the second volume Bragg grating are arranged at intervals, and the pump light is located in the first volume Bragg grating; Between the plane where the one-body Bragg grating is located and the plane where the second volume Bragg grating is located; the third volume Bragg grating is located on the diffraction light path of
  • the volume Bragg grating is used as a reflection mirror and an output mirror respectively, and the volume Bragg grating is used to coordinate the gain competition between the two laser oscillation wavelengths in the resonant cavity, so as to realize stable and balanced dual-wavelength laser output.
  • FIG. 1 is a structural diagram of a dual-wavelength resonant cavity provided by an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of an included angle between volume Bragg gratings according to an embodiment of the present invention
  • FIG. 3 is a simulation curve diagram of the angle selectivity of transmissive volume Bragg gratings with different grating thicknesses according to an embodiment of the present invention
  • FIG. 4 is a simulation graph of the angle selectivity of the transmissive volume Bragg gratings with different grating periods according to an embodiment of the present invention
  • FIG. 5 is a simulation curve diagram of wavelength selectivity of reflective volume Bragg gratings with different grating thicknesses according to an embodiment of the present invention
  • FIG. 6 is a simulation graph of wavelength selectivity of reflective volume Bragg gratings with different grating periods according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a curve of an output dual wavelength provided by an embodiment of the present invention.
  • TVBG1 the first volume Bragg grating
  • TVBG2 the second volume Bragg grating
  • RVBG3 the third volume Bragg grating
  • RVBG4 the fourth volume Bragg grating.
  • the purpose of the present invention is to provide a dual-wavelength resonant cavity based on volume Bragg grating, which uses the volume Bragg grating as an output mirror (spectral selection element) to coordinate the gain competition between the two laser oscillation wavelengths in the resonant cavity, so as to achieve a stable and balanced resonator. Dual wavelength laser output.
  • FIG. 1 is a structural diagram of the dual-wavelength resonator provided by the embodiment of the present invention.
  • the dual-wavelength resonator includes: a first pair of volume Bragg gratings and a second pair of volume Bragg gratings; the first pair of volume Bragg gratings includes a first volume Bragg grating TVBG1 and a third volume Bragg grating RVBG3, and the second pair of volume Bragg gratings includes a second volume Bragg grating TVBG2 and a fourth volume Bragg grating RVBG4.
  • the dual-wavelength resonator is used to form laser oscillation and output dual-wavelength laser light.
  • Both the first volume Bragg grating and the second volume Bragg grating are located on the outgoing optical path of the pump light.
  • the first volume Bragg grating TVBG1 and the second volume Bragg grating TVBG2 are arranged at intervals, and the pump light is located between the plane where the first volume Bragg grating is located and the plane where the second volume Bragg grating is located.
  • the first volume Bragg grating and the second volume Bragg grating are arranged obliquely, so that the pump light is incident on the first volume Bragg grating and the second volume Bragg grating.
  • the third volume Bragg grating is located on the diffraction optical path of the first volume Bragg grating; the angle between the plane where the third volume Bragg grating is located and the plane where the first volume Bragg grating is located is the first preset angle, and the third volume Bragg grating is The reflected light path coincides with the diffracted light path of the first volume Bragg grating.
  • the included angle between the third volume Bragg grating and the first volume Bragg grating that is, the range of the first preset angle ⁇ 1 is .
  • the fourth volume Bragg grating is located on the diffraction light path of the second volume Bragg grating; the included angle between the plane where the fourth volume Bragg grating is located and the plane where the second volume Bragg grating is located is the second preset angle, and the fourth volume Bragg grating is The reflected light path coincides with the diffracted light path of the second volume Bragg grating.
  • the included angle between the fourth volume Bragg grating and the second volume Bragg grating that is, the range of the second preset angle ⁇ 2 is .
  • the ranges of the first preset angle and the second preset angle are both 10° ⁇ 30°.
  • the first volume Bragg grating is used for outputting light that meets the first preset transmission condition of the first volume Bragg grating, and diffracting light that does not meet the first preset transmission condition.
  • the second volume Bragg grating is used for outputting light that meets the second preset transmission condition of the second volume Bragg grating, and diffracting light that does not meet the second preset transmission condition.
  • the third volume Bragg grating is used for reflecting light conforming to a third preset reflection condition of the third volume Bragg grating.
  • the third volume Bragg grating is also used to filter light that does not meet the third preset reflection condition.
  • the fourth volume Bragg grating is used to reflect light conforming to a fourth preset reflection condition of the fourth volume Bragg grating.
  • the fourth volume Bragg grating is also used to filter light that does not meet the fourth preset reflection condition.
  • the third volume Bragg grating and the fourth volume Bragg grating are placed obliquely, and the diffracted light output by the first volume Bragg grating and the second volume Bragg grating is guaranteed to be normally incident on the third volume Bragg grating and the fourth volume Bragg grating.
  • the first volume Bragg grating TVBG1 and the second volume Bragg grating TVBG2 are both transmissive volume Bragg gratings.
  • the third volume Bragg grating RVBG3 and the fourth volume Bragg grating RVBG4 are both reflective volume Bragg gratings.
  • Each pair of volume Bragg gratings is aligned in the resonator and can be used as the mirror and output cavity mirror of the dual-wavelength resonator, namely the first volume Bragg grating TVBG1 and the third volume Bragg grating RVBG3 are aligned in the resonator and form a resonator
  • the reflector 1, and the reflector 1 can also be used as the output coupling mirror 1;
  • the second volume Bragg grating TVBG2 and the fourth volume Bragg grating RVBG4 are aligned in the resonator and form the reflector 2 of the resonator, and the reflector 2 can also be as the output coupling mirror 2 .
  • Mirror 1 (output coupling mirror 1 ) and mirror 2 (output coupling mirror 2 ) are combined reflective volume Bragg gratings and transmissive volume Bragg gratings.
  • the propagation path of the light is as follows: the pump light is injected from the side end of the resonant cavity, and is incident on the first volume Bragg grating and the second volume Bragg grating at the Bragg angle and diffracted by the first volume Bragg grating and the second volume Bragg grating respectively,
  • the diffracted light of the first volume Bragg grating enters the third volume Bragg grating, the diffracted light that meets the third preset reflection condition is diffracted (reflected) by the third volume Bragg grating, and the diffracted light of the third volume Bragg grating is along the first volume Bragg grating.
  • the diffracted light path of the second volume Bragg grating returns to enter the first volume Bragg grating; the diffracted light of the second volume Bragg grating enters the fourth volume Bragg grating, and the diffracted light that meets the fourth preset reflection condition is diffracted (reflected) by the fourth volume Bragg grating; The diffracted light of the volume Bragg grating returns to enter the second volume Bragg grating along the diffracted light path of the second volume Bragg grating; The diffracted light enters the third volume Bragg grating and the fourth volume Bragg grating after re-diffraction, so that the light oscillates, and the transmitted light of the reflective Bragg grating is output based on the wavelength selection of the grating.
  • the pump light in this embodiment is radiation light.
  • the diffracted light that does not meet the third preset reflection condition and the fourth preset reflection condition is filtered out of the dual-wavelength resonator by the third volume Bragg grating and the fourth volume Bragg grating, respectively.
  • the first preset reflection condition, the second preset reflection condition, the third preset reflection condition and the fourth preset reflection condition are all determined by wavelength selection parameters of the corresponding volume Bragg grating.
  • the grating periods of the first volume Bragg grating and the second volume Bragg grating are the same, or the grating thicknesses of the first volume Bragg grating and the second volume Bragg grating are the same.
  • the grating periods of the third volume Bragg grating and the fourth volume Bragg grating are the same, or the grating thicknesses of the third volume Bragg grating and the fourth volume Bragg grating are the same.
  • the first volume Bragg grating, the second volume Bragg grating, the third volume Bragg grating, and the fourth volume Bragg grating are all uniform periodic gratings and are all phase-type volume Bragg gratings, that is, the first volume Bragg grating and the second volume Bragg grating are
  • the transmission type volume Bragg grating of the phase type volume Bragg grating, the third volume Bragg grating and the fourth volume Bragg grating are the phase type volume Bragg grating reflection type volume Bragg grating, and the first volume Bragg grating, the second volume Bragg grating, the third volume Bragg grating
  • the three-volume Bragg grating and the fourth volume Bragg grating are periodically uniform.
  • the distance between the third volume Bragg grating RVBG3 and the first volume Bragg grating TVBG1 is equal to the distance between the fourth volume Bragg grating RVBG4 and the second volume Bragg grating TVBG2.
  • the positions of the two pairs of volume Bragg gratings are shown in FIG.
  • the placement positions of the third volume Bragg grating and the fourth volume Bragg grating enable the first volume Bragg grating and the second volume Bragg grating
  • the diffracted light of the volume Bragg grating is incident on the third volume Bragg grating and the fourth volume Bragg grating as the incident light of the third volume Bragg grating and the fourth volume Bragg grating, and the diffraction of the third volume Bragg grating and the fourth volume Bragg grating is simultaneously
  • the light can return to the original path according to the path of the diffracted light of the first volume Bragg grating and the second volume Bragg grating.
  • L 1 represents the distance between the first volume Bragg grating and the second volume Bragg grating
  • L 2 represents the distance between the first volume Bragg grating and the third volume Bragg grating
  • L 3 represents the second volume Bragg grating and the third volume Bragg grating. Distance between quad Bragg gratings.
  • the dual-wavelength resonator further includes: a laser gain substance; the laser gain substance is used to amplify the light in the dual-wavelength resonator.
  • the first volume Bragg grating, the second volume Bragg grating, the third volume Bragg grating and the fourth volume Bragg grating in this embodiment are all located in the same laser gain material.
  • the laser gain material adopts neodymium-doped yttrium aluminum garnet (Nd: YAG) laser crystal or ytterbium-doped yttrium aluminum garnet (Yb: YAG) laser crystal or other laser crystals.
  • the volume Bragg grating is made of photothermographic refractive index glass, which is a silicate glass doped with cerium, silver and fluorine.
  • the dual-wavelength resonator of this embodiment mainly performs intracavity oscillation for infrared light.
  • the first volume Bragg grating, the second volume Bragg grating, the third volume Bragg grating and the fourth volume Bragg grating all have excellent angular selectivity, wavelength selectivity and high diffraction efficiency, and are considered to be ideal wavelength and angle selections device with high tunability.
  • the parameters of the incident angle, diffraction angle, central wavelength, and angle (spectral) selectivity of the volume Bragg grating can be changed by changing the grating structure parameters of the volume Bragg grating, such as the grating thickness, the degree of refractive index modulation, the grating period and the grating vector tilt angle. adjust.
  • the grating vector inclination angle refers to the angle at which the grating fringe plane is perpendicular to the incident plane and is inclined relative to the medium boundary at an angle of ⁇ .
  • the excellent optical properties of the first volume Bragg grating, the second volume Bragg grating, the third volume Bragg grating and the fourth volume Bragg grating are mainly manifested in:
  • the wavelength selectivity of the transmissive volume Bragg grating is 0.3nm ⁇ 20nm, and the wavelength selectivity of the reflective volume Bragg grating is 0.01nm ⁇ 10nm;
  • the angular selectivity of the transmissive volume Bragg grating is 0.1mrad ⁇ 10mrad, and the angular selectivity of the reflective volume Bragg grating is 10mrad ⁇ 100mrad;
  • the diffraction efficiency of the transmissive volume Bragg grating can reach 99% in the wavelength range of 633nm to 1550nm, and the diffraction efficiency of the reflective volume Bragg grating can reach 97% in the wavelength range of 633nm to 1550nm, so a single volume Bragg grating can reach 97%. High diffraction efficiency in the wavelength range of 633nm to 1550nm;
  • the damage threshold is high.
  • the damage threshold can reach 7J/cm 2 ⁇ 10J/cm 2 ; for a laser pulse width of 8ns ⁇ 10ns
  • the damage threshold of YAG laser can reach 30J/cm 2 ⁇ 40J/cm 2 ;
  • the loss is small, and the loss of the volume Bragg grating is less than 2.5%.
  • Volume Bragg gratings have excellent angular selectivity and wavelength selectivity.
  • angle selectivity of transmissive volume Bragg gratings and the wavelength selectivity of reflective volume Bragg gratings By combining the angle selectivity of transmissive volume Bragg gratings and the wavelength selectivity of reflective volume Bragg gratings to narrow the beam bandwidth, by adjusting the The angle selectivity and the wavelength selectivity of the reflective volume Bragg grating allow the intersection of the wavelength bandwidths to generate an optical filter with a spacing less than or equal to the longitudinal mode to select the desired longitudinal mode. It is precisely because the narrow-band filter composed of the combined structure of the transmissive volume Bragg grating and the reflective volume Bragg grating can perform longitudinal mode selection, the combined structure of the transmissive volume Bragg grating and the reflective volume Bragg grating can be used as a dual-wavelength resonator.
  • volume Bragg grating According to the diffraction theory of volume Bragg grating, the diffraction characteristics of volume Bragg grating are closely related to the grating period, grating thickness and refractive index modulation. Matching each other achieves volume Bragg gratings with specific diffraction efficiency and spectral selectivity.
  • the diffraction efficiency increases with the product of the grating thickness and the refractive index modulation degree and changes periodically in the range of 0% to 100%, and its spectral selectivity varies with the grating thickness and refractive index modulation.
  • the diffraction efficiency increases with the increase of the grating thickness and the refractive index modulation degree, and finally tends to 100%, and the spectral selectivity varies with the grating thickness and refractive index.
  • the modulation degree increases and decreases.
  • FIG. 3 is a simulation graph of the angle selectivity of the first volume Bragg grating or the second volume Bragg grating when the incident wavelength is 1064 nm and the grating thickness d is 2.5 mm and 3.5 mm, respectively.
  • the parameters of the first volume Bragg grating or the second volume Bragg grating in FIG. 3 are: the Bragg wavelength is 1064 nm, the grating period is 3 ⁇ m, and the grating vector tilt angle is 90°.
  • the incident beam of the volume Bragg grating does not satisfy the Bragg condition, that is, it deviates from the Bragg angle. At this time, the volume Bragg grating has angular selectivity.
  • FIG. 4 is a simulation graph of the angle selectivity of the first volume Bragg grating or the second volume Bragg grating when the incident wavelength is 1064 nm and the grating period ⁇ is 2 ⁇ m and 3 ⁇ m, respectively.
  • the parameters of the first volume Bragg grating or the second volume Bragg grating in FIG. 4 are: the Bragg wavelength is 1064 nm, the grating thickness is 2.5 mm, and the grating vector inclination angle is 90°.
  • FIG. 5 is a graph showing the wavelength selectivity of the third volume Bragg grating and the fourth volume Bragg grating when the incident wavelength is 1064 nm and the grating thickness d is 4 mm and 5 mm, respectively.
  • the parameters of the third volume Bragg grating or the fourth volume Bragg grating in FIG. 5 are: the Bragg wavelength is 1064 nm, the grating period is 0.6 ⁇ m, and the grating vector tilt angle is 90°.
  • FIG. 6 is a graph showing the wavelength selectivity of the third volume Bragg grating and the fourth volume Bragg grating when the incident wavelength is 1064 nm and the grating period ⁇ is 0.5 ⁇ m and 0.6 ⁇ m, respectively.
  • the parameters of the third volume Bragg grating or the fourth volume Bragg grating in FIG. 6 are: the Bragg wavelength is 1064 nm, the grating thickness is 5 mm, and the grating vector inclination angle is 90°.
  • FIG. 7 is a schematic diagram of a dual-wavelength curve output by a dual-wavelength resonator of the present invention when the incident wavelength is 1064 nm, the full width at half maximum is used to represent the width of the output wavelength, and the full width at half maximum of the dual-wavelength output is both 0.5 nm, curve 1 It represents the output wavelength with the center wavelength of 1063.2nm, and the curve 2 represents the output wavelength with the center wavelength of 1064.8nm.
  • the invention adopts the resonant cavity structure of two pairs of volume Bragg gratings, outputs laser light in two directions at the same time, has a simple structure and is easy to implement; by adjusting the grating structure parameters of the volume Bragg grating, the output wavelength of the first volume Bragg grating and the second volume can be realized.
  • the wavelength difference of the output wavelength of the volume Bragg grating is a few nanometers or even lower, and the output beam quality can be optimized by filtering out the middle and high frequency components in the beam and optimizing the wavefront through the volume Bragg grating.
  • the design field of the optical resonator of the wavelength laser through the combined structure of the transmissive volume Bragg grating and the reflective volume Bragg grating, and controlling the structural parameters (thickness and period) of each volume Bragg grating, the angle selection of the transmissive volume Bragg grating is realized
  • the combination of wavelength selectivity and wavelength selectivity of reflective volume Bragg gratings narrows the beam bandwidth; simplifies the structure of longitudinal mode lasers, improves anti-interference ability, and has the potential for high power output; the angular selectivity of transmissive volume Bragg gratings can limit the cavity
  • the inner beam divergence angle is conducive to the realization of large transverse mode diameter and large energy output.
  • the invention adopts photothermographic refractive index glass as the material for preparing the grating, which can carry high laser power; and does not change the polarization state of the radiated light, has good stability and strong anti-interference ability, so that the volume Bragg grating is less affected by temperature, Low losses and high damage threshold.

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Abstract

Provided is a dual-wavelength resonant cavity based on a volume Bragg grating, comprising: first to fourth volume Bragg gratings (TVBG1, TVBG2, RVBG3, RVBG4); the first volume Bragg grating (TVBG1) and the second volume Bragg grating (TVBG2) are arranged at intervals; the reflected-light optical path of a third volume Bragg grating (RVBG3) coincides with the diffracted-light optical path of the first volume Bragg grating (TVBG1); the reflected-light optical path of a fourth volume Bragg grating (RVBG4) coincides with the diffracted-light optical path of the second volume Bragg grating (TVBG2); the first volume Bragg grating (TVBG1) and the second volume Bragg grating (TVBG2) are located on the emitted light path of a pumping light; the first volume Bragg grating (TVBG1) and the second volume Bragg grating (TVBG2) output dual wavelength laser light. The volume Bragg gratings serve as reflectors and output mirrors, respectively; using the volume Bragg gratings to coordinate the gain competition between two laser oscillation wavelengths in the resonant cavity achieves stable and balanced dual-wavelength laser light output.

Description

一种基于体布拉格光栅的双波长谐振腔A Dual-Wavelength Resonator Based on Volume Bragg Grating 技术领域technical field
本发明涉及激光技术领域，特别是涉及一种基于体布拉格光栅的双波长谐振腔。The invention relates to the field of laser technology, in particular to a dual-wavelength resonant cavity based on a volume Bragg grating.
背景技术Background technique
由于双波长激光器具有结构简单紧凑、效率高和输出光束质量好等优点，近年来，激光通信、特征识别、干涉彩虹全息以及精细激光光谱等越来越多的领域对双波长激光器的需求越来越大，使双波长激光器具有广阔的应用前景。Due to the advantages of simple and compact structure, high efficiency and good output beam quality of dual-wavelength lasers, in recent years, the demand for dual-wavelength lasers in more and more fields such as laser communication, feature recognition, interference rainbow holography, and fine laser spectroscopy has increased. The larger the value, the more promising the dual-wavelength laser will be.
双波长激光器是利用固体作为工作物质产生激光的器件，它包括谐振腔、泵浦源和工作物质三个主要组成部分。谐振腔是为光波来回振荡提供反馈的空腔，通常由两块与工作物质轴线垂直的反射镜构成，光线在稳定的谐振腔内往返多次也不会逸出腔外。A dual-wavelength laser is a device that uses a solid as a working substance to generate laser light. It includes three main components: a resonator, a pump source and a working substance. The resonant cavity is a cavity that provides feedback for the back and forth oscillation of the light wave. It is usually composed of two mirrors that are perpendicular to the axis of the working material. The light will not escape from the cavity after going back and forth in the stable resonant cavity for many times.
目前，双波长激光器多为固体激光器，如普通的调Q双波长激光器采用单一激光增益介质从输出镜获得双波长激光同时输出，但当两种波长激光在同一增益介质中产生时，两种波长激光的跃迁谱线之间存在着激烈的增益竞争，影响了激光输出的稳定性。At present, most dual-wavelength lasers are solid-state lasers. For example, ordinary Q-switched dual-wavelength lasers use a single laser gain medium to obtain dual-wavelength lasers from the output mirror and output simultaneously. However, when two wavelengths of lasers are generated in the same gain medium, the two wavelengths There is fierce gain competition between the transition lines of the laser, which affects the stability of the laser output.
发明内容SUMMARY OF THE INVENTION
本发明的目的是提供一种基于体布拉格光栅的双波长谐振腔，将体布拉格光栅作为输出镜(光谱选择元件)协调谐振腔内两种激光振荡波长之间的增益竞争，实现稳定、均衡的双波长激光输出。The purpose of the present invention is to provide a dual-wavelength resonant cavity based on volume Bragg grating, which uses the volume Bragg grating as an output mirror (spectral selection element) to coordinate the gain competition between the two laser oscillation wavelengths in the resonant cavity, so as to achieve a stable and balanced resonator. Dual wavelength laser output.
为实现上述目的，本发明提供了如下方案：For achieving the above object, the present invention provides the following scheme:
一种基于体布拉格光栅的双波长谐振腔，包括：第一对体布拉格光栅和第二对体布拉格光栅；所述第一对体布拉格光栅包括第一体布拉格光栅和第三体布拉格光栅，所述第二对体布拉格光栅包括第二体布拉格光栅和第四体布拉格光栅；A dual-wavelength resonant cavity based on volume Bragg gratings, comprising: a first pair of volume Bragg gratings and a second pair of volume Bragg gratings; the first pair of volume Bragg gratings includes a first volume Bragg grating and a third volume Bragg grating, so The second pair of volume Bragg gratings includes a second volume Bragg grating and a fourth volume Bragg grating;
所述第一体布拉格光栅和所述第二体布拉格光栅均位于泵浦光的出射光路上；Both the first volume Bragg grating and the second volume Bragg grating are located on the outgoing optical path of the pump light;
所述第一体布拉格光栅与所述第二体布拉格光栅间隔设置，且所述泵浦光位于所述第一体布拉格光栅所处平面与所述第二体布拉格光栅所处平面之间；the first volume Bragg grating and the second volume Bragg grating are arranged at intervals, and the pump light is located between the plane where the first volume Bragg grating is located and the plane where the second volume Bragg grating is located;
所述第三体布拉格光栅位于所述第一体布拉格光栅的衍射光路上；所述第三体布拉格光栅所处平面与所述第一体布拉格光栅所处平面的夹角为第一预设角度，且所述第三体布拉格光栅的反射光光路与所述第一体布拉格光栅的衍射光光路重合；The third volume Bragg grating is located on the diffraction light path of the first volume Bragg grating; the angle between the plane where the third volume Bragg grating is located and the plane where the first volume Bragg grating is located is a first preset angle , and the reflected light path of the third volume Bragg grating coincides with the diffracted light path of the first volume Bragg grating;
所述第四体布拉格光栅位于所述第二体布拉格光栅的衍射光路上；所述第四体布拉格光栅所处平面与所述第二体布拉格光栅所处平面的夹角为第二预设角度，且所述第四体布拉格光栅的反射光光路与所述第二体布拉格光栅的衍射光光路重合；The fourth volume Bragg grating is located on the diffraction light path of the second volume Bragg grating; the included angle between the plane where the fourth volume Bragg grating is located and the plane where the second volume Bragg grating is located is a second preset angle , and the reflected light path of the fourth volume Bragg grating coincides with the diffracted light path of the second volume Bragg grating;
所述第一体布拉格光栅用于输出符合所述第一体布拉格光栅的第一预设透射条件的光，以及衍射未符合所述第一预设透射条件的光；The first volume Bragg grating is used for outputting light that meets a first preset transmission condition of the first volume Bragg grating, and diffracting light that does not meet the first preset transmission condition;
所述第二体布拉格光栅用于输出符合所述第二体布拉格光栅的第二预设透射条件的光，以及衍射未符合所述第二预设透射条件的光；The second volume Bragg grating is configured to output light that meets the second preset transmission condition of the second volume Bragg grating, and diffract light that does not meet the second preset transmission condition;
所述第三体布拉格光栅用于反射符合所述第三体布拉格光栅的第三预设反射条件的光；the third volume Bragg grating is used for reflecting light that meets the third preset reflection condition of the third volume Bragg grating;
所述第四体布拉格光栅用于反射符合所述第四体布拉格光栅的第四预设反射条件的光。The fourth volume Bragg grating is used for reflecting light that meets a fourth preset reflection condition of the fourth volume Bragg grating.
可选的，所述第一体布拉格光栅和所述第二体布拉格光栅均为透射型体布拉格光栅；Optionally, the first volume Bragg grating and the second volume Bragg grating are both transmissive volume Bragg gratings;
所述第三体布拉格光栅和所述第四体布拉格光栅均为反射型体布拉格光栅。The third volume Bragg grating and the fourth volume Bragg grating are both reflective volume Bragg gratings.
可选的，所述第一体布拉格光栅和所述第二体布拉格光栅的光栅周期相同。Optionally, grating periods of the first volume Bragg grating and the second volume Bragg grating are the same.
可选的，所述第三体布拉格光栅和所述第四体布拉格光栅的光栅周期相同。Optionally, grating periods of the third volume Bragg grating and the fourth volume Bragg grating are the same.
可选的，所述第一体布拉格光栅和所述第二体布拉格光栅的光栅厚度相同。Optionally, the grating thicknesses of the first volume Bragg grating and the second volume Bragg grating are the same.
可选的，所述第三体布拉格光栅和所述第四体布拉格光栅的光栅厚度相 同。Optionally, grating thicknesses of the third volume Bragg grating and the fourth volume Bragg grating are the same.
可选的，所述第三体布拉格光栅与所述第一体布拉格光栅之间的距离等于所述第四体布拉格光栅与所述第二体布拉格光栅之间的距离。Optionally, the distance between the third volume Bragg grating and the first volume Bragg grating is equal to the distance between the fourth volume Bragg grating and the second volume Bragg grating.
根据本发明提供的具体实施例，本发明公开了以下技术效果：According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:
本发明提供了一种基于体布拉格光栅的双波长谐振腔。该双波长谐振腔包括：第一对体布拉格光栅和第二对体布拉格光栅；第一对体布拉格光栅包括第一体布拉格光栅和第三体布拉格光栅，第二对体布拉格光栅包括第二体布拉格光栅和第四体布拉格光栅；第一体布拉格光栅和第二体布拉格光栅均位于泵浦光的出射光路上；第一体布拉格光栅与第二体布拉格光栅间隔设置，且泵浦光位于第一体布拉格光栅所处平面与第二体布拉格光栅所处平面之间；第三体布拉格光栅位于第一体布拉格光栅的衍射光路上；第三体布拉格光栅所处平面与第一体布拉格光栅所处平面的夹角为第一预设角度，且第三体布拉格光栅的反射光光路与第一体布拉格光栅的衍射光光路重合；第四体布拉格光栅位于第二体布拉格光栅的衍射光路上；第四体布拉格光栅所处平面与第二体布拉格光栅所处平面的夹角为第二预设角度，且第四体布拉格光栅的反射光光路与第二体布拉格光栅的衍射光光路重合；第一体布拉格光栅用于输出符合第一体布拉格光栅的第一预设透射条件的光，以及衍射未符合第一预设透射条件的光；第二体布拉格光栅用于输出符合第二体布拉格光栅的第二预设透射条件的光，以及衍射未符合第二预设透射条件的光；第三体布拉格光栅用于反射符合第三体布拉格光栅的第三预设反射条件的光；第四体布拉格光栅用于反射符合第四体布拉格光栅的第四预设反射条件的光。本发明将体布拉格光栅分别作为反射镜和输出镜，利用体布拉格光栅协调谐振腔内两种激光振荡波长之间的增益竞争，实现稳定、均衡的双波长激光输出。The invention provides a dual-wavelength resonant cavity based on a volume Bragg grating. The dual-wavelength resonant cavity includes: a first pair of volume Bragg gratings and a second pair of volume Bragg gratings; the first pair of volume Bragg gratings includes a first volume Bragg grating and a third volume Bragg grating, and the second pair of volume Bragg gratings includes a second volume Bragg grating Bragg grating and fourth volume Bragg grating; both the first volume Bragg grating and the second volume Bragg grating are located on the outgoing light path of the pump light; the first volume Bragg grating and the second volume Bragg grating are arranged at intervals, and the pump light is located in the first volume Bragg grating; Between the plane where the one-body Bragg grating is located and the plane where the second volume Bragg grating is located; the third volume Bragg grating is located on the diffraction light path of the first volume Bragg grating; the plane where the third volume Bragg grating is located and the plane where the first volume Bragg grating is located; The included angle between the planes is the first preset angle, and the reflected light path of the third volume Bragg grating coincides with the diffracted light path of the first volume Bragg grating; the fourth volume Bragg grating is located on the diffracted light path of the second volume Bragg grating; The included angle between the plane where the fourth volume Bragg grating is located and the plane where the second volume Bragg grating is located is a second preset angle, and the reflected light path of the fourth volume Bragg grating coincides with the diffracted light path of the second volume Bragg grating; The integrated Bragg grating is used for outputting light that meets the first preset transmission condition of the first volume Bragg grating, and diffracting light that does not meet the first preset transmission condition; the second volume Bragg grating is used for outputting light that meets the second volume Bragg grating The second preset transmission condition of the light is diffracted, and the light that does not meet the second preset transmission condition is diffracted; the third volume Bragg grating is used to reflect the light that meets the third preset reflection condition of the third volume Bragg grating; the fourth volume Bragg grating The Bragg grating is used to reflect light conforming to the fourth preset reflection condition of the fourth volume Bragg grating. In the invention, the volume Bragg grating is used as a reflection mirror and an output mirror respectively, and the volume Bragg grating is used to coordinate the gain competition between the two laser oscillation wavelengths in the resonant cavity, so as to realize stable and balanced dual-wavelength laser output.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.
图1为本发明实施例所提供的双波长谐振腔的结构图；1 is a structural diagram of a dual-wavelength resonant cavity provided by an embodiment of the present invention;
图2为本发明实施例所提供的体布拉格光栅之间夹角的结构示意图；2 is a schematic structural diagram of an included angle between volume Bragg gratings according to an embodiment of the present invention;
图3为本发明实施例所提供的不同光栅厚度的透射型体布拉格光栅的角度选择性模拟曲线图；FIG. 3 is a simulation curve diagram of the angle selectivity of transmissive volume Bragg gratings with different grating thicknesses according to an embodiment of the present invention;
图4为本发明实施例所提供的不同光栅周期的透射型体布拉格光栅的角度选择性模拟曲线图；FIG. 4 is a simulation graph of the angle selectivity of the transmissive volume Bragg gratings with different grating periods according to an embodiment of the present invention;
图5为本发明实施例所提供的不同光栅厚度的反射型体布拉格光栅的波长选择性模拟曲线图；FIG. 5 is a simulation curve diagram of wavelength selectivity of reflective volume Bragg gratings with different grating thicknesses according to an embodiment of the present invention;
图6为本发明实施例所提供的不同光栅周期的反射型体布拉格光栅的波长选择性模拟曲线图；FIG. 6 is a simulation graph of wavelength selectivity of reflective volume Bragg gratings with different grating periods according to an embodiment of the present invention;
图7为本发明实施例所提供的输出双波长的曲线示意图。FIG. 7 is a schematic diagram of a curve of an output dual wavelength provided by an embodiment of the present invention.
符号说明：TVBG1、第一体布拉格光栅；TVBG2、第二体布拉格光栅；RVBG3、第三体布拉格光栅；RVBG4、第四体布拉格光栅。Symbol description: TVBG1, the first volume Bragg grating; TVBG2, the second volume Bragg grating; RVBG3, the third volume Bragg grating; RVBG4, the fourth volume Bragg grating.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
本发明的目的是提供一种基于体布拉格光栅的双波长谐振腔，将体布拉格光栅作为输出镜(光谱选择元件)协调谐振腔内两种激光振荡波长之间的增益竞争，实现稳定、均衡的双波长激光输出。The purpose of the present invention is to provide a dual-wavelength resonant cavity based on volume Bragg grating, which uses the volume Bragg grating as an output mirror (spectral selection element) to coordinate the gain competition between the two laser oscillation wavelengths in the resonant cavity, so as to achieve a stable and balanced resonator. Dual wavelength laser output.
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合附图和具体实施方式对本发明作进一步详细的说明。In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
本实施例提供一种基于体布拉格光栅的双波长谐振腔，图1为本发明实施例所提供的双波长谐振腔的结构图，参见图1，双波长谐振腔包括：第一对体布拉格光栅和第二对体布拉格光栅；第一对体布拉格光栅包括第一体布拉格光栅TVBG1和第三体布拉格光栅RVBG3，第二对体布拉格光栅包括第二体布拉格光栅TVBG2和第四体布拉格光栅RVBG4。This embodiment provides a dual-wavelength resonator based on a volume Bragg grating. FIG. 1 is a structural diagram of the dual-wavelength resonator provided by the embodiment of the present invention. Referring to FIG. 1 , the dual-wavelength resonator includes: a first pair of volume Bragg gratings and a second pair of volume Bragg gratings; the first pair of volume Bragg gratings includes a first volume Bragg grating TVBG1 and a third volume Bragg grating RVBG3, and the second pair of volume Bragg gratings includes a second volume Bragg grating TVBG2 and a fourth volume Bragg grating RVBG4.
双波长谐振腔用于形成激光振荡，并输出双波长激光。The dual-wavelength resonator is used to form laser oscillation and output dual-wavelength laser light.
第一体布拉格光栅和第二体布拉格光栅均位于泵浦光的出射光路上。Both the first volume Bragg grating and the second volume Bragg grating are located on the outgoing optical path of the pump light.
第一体布拉格光栅TVBG1与第二体布拉格光栅TVBG2间隔设置，且泵浦光位于第一体布拉格光栅所处平面与第二体布拉格光栅所处平面之间。第一体布拉格光栅和第二体布拉格光栅倾斜设置，便于泵浦光入射至第一体布拉格光栅和第二体布拉格光栅。The first volume Bragg grating TVBG1 and the second volume Bragg grating TVBG2 are arranged at intervals, and the pump light is located between the plane where the first volume Bragg grating is located and the plane where the second volume Bragg grating is located. The first volume Bragg grating and the second volume Bragg grating are arranged obliquely, so that the pump light is incident on the first volume Bragg grating and the second volume Bragg grating.
第三体布拉格光栅位于第一体布拉格光栅的衍射光路上；第三体布拉格光栅所处平面与第一体布拉格光栅所处平面的夹角为第一预设角度，且第三体布拉格光栅的反射光光路与第一体布拉格光栅的衍射光光路重合。参见图2，第三体布拉格光栅与第一体布拉格光栅之间的夹角，即第一预设角度θ 1的范围为。 The third volume Bragg grating is located on the diffraction optical path of the first volume Bragg grating; the angle between the plane where the third volume Bragg grating is located and the plane where the first volume Bragg grating is located is the first preset angle, and the third volume Bragg grating is The reflected light path coincides with the diffracted light path of the first volume Bragg grating. Referring to FIG. 2 , the included angle between the third volume Bragg grating and the first volume Bragg grating, that is, the range of the first preset angle θ 1 is .
第四体布拉格光栅位于第二体布拉格光栅的衍射光路上；第四体布拉格光栅所处平面与第二体布拉格光栅所处平面的夹角为第二预设角度，且第四体布拉格光栅的反射光光路与第二体布拉格光栅的衍射光光路重合。参见图2，第四体布拉格光栅与第二体布拉格光栅之间的夹角，即第二预设角度θ 2的范围为。其中，第一预设角度和第二预设角度的范围均为10°～30°。 The fourth volume Bragg grating is located on the diffraction light path of the second volume Bragg grating; the included angle between the plane where the fourth volume Bragg grating is located and the plane where the second volume Bragg grating is located is the second preset angle, and the fourth volume Bragg grating is The reflected light path coincides with the diffracted light path of the second volume Bragg grating. Referring to FIG. 2 , the included angle between the fourth volume Bragg grating and the second volume Bragg grating, that is, the range of the second preset angle θ 2 is . The ranges of the first preset angle and the second preset angle are both 10°˜30°.
第一体布拉格光栅用于输出符合第一体布拉格光栅的第一预设透射条件的光，以及衍射未符合第一预设透射条件的光。The first volume Bragg grating is used for outputting light that meets the first preset transmission condition of the first volume Bragg grating, and diffracting light that does not meet the first preset transmission condition.
第二体布拉格光栅用于输出符合第二体布拉格光栅的第二预设透射条件的光，以及衍射未符合第二预设透射条件的光。The second volume Bragg grating is used for outputting light that meets the second preset transmission condition of the second volume Bragg grating, and diffracting light that does not meet the second preset transmission condition.
第三体布拉格光栅用于反射符合第三体布拉格光栅的第三预设反射条件的光。第三体布拉格光栅还用于过滤不符合第三预设反射条件的光。The third volume Bragg grating is used for reflecting light conforming to a third preset reflection condition of the third volume Bragg grating. The third volume Bragg grating is also used to filter light that does not meet the third preset reflection condition.
第四体布拉格光栅用于反射符合第四体布拉格光栅的第四预设反射条件的光。第四体布拉格光栅还用于过滤不符合第四预设反射条件的光。The fourth volume Bragg grating is used to reflect light conforming to a fourth preset reflection condition of the fourth volume Bragg grating. The fourth volume Bragg grating is also used to filter light that does not meet the fourth preset reflection condition.
第三体布拉格光栅和第四体布拉格光栅倾斜放置，且保证经第一体布拉格光栅和第二体布拉格光栅输出的衍射光正入射第三体布拉格光栅和第四体布拉格光栅。The third volume Bragg grating and the fourth volume Bragg grating are placed obliquely, and the diffracted light output by the first volume Bragg grating and the second volume Bragg grating is guaranteed to be normally incident on the third volume Bragg grating and the fourth volume Bragg grating.
第一体布拉格光栅TVBG1和第二体布拉格光栅TVBG2均为透射型体布拉格光栅。The first volume Bragg grating TVBG1 and the second volume Bragg grating TVBG2 are both transmissive volume Bragg gratings.
第三体布拉格光栅RVBG3和第四体布拉格光栅RVBG4均为反射型体布拉格光栅。The third volume Bragg grating RVBG3 and the fourth volume Bragg grating RVBG4 are both reflective volume Bragg gratings.
每对体布拉格光栅在谐振腔内对齐并均可作为双波长谐振腔的反射腔镜和输出腔镜，即第一体布拉格光栅TVBG1和第三体布拉格光栅RVBG3在谐振腔内对齐并组成谐振腔的反射镜1，同时反射镜1也可作为输出耦合镜1；第二体布拉格光栅TVBG2和第四体布拉格光栅RVBG4在谐振腔内对齐并组成谐振腔的反射镜2，同时反射镜2也可作为输出耦合镜2。反射镜1(输出耦合镜1)和反射镜2(输出耦合镜2)为组合式的反射型体布拉格光栅和透射型体布拉格光栅。Each pair of volume Bragg gratings is aligned in the resonator and can be used as the mirror and output cavity mirror of the dual-wavelength resonator, namely the first volume Bragg grating TVBG1 and the third volume Bragg grating RVBG3 are aligned in the resonator and form a resonator The reflector 1, and the reflector 1 can also be used as the output coupling mirror 1; the second volume Bragg grating TVBG2 and the fourth volume Bragg grating RVBG4 are aligned in the resonator and form the reflector 2 of the resonator, and the reflector 2 can also be as the output coupling mirror 2 . Mirror 1 (output coupling mirror 1 ) and mirror 2 (output coupling mirror 2 ) are combined reflective volume Bragg gratings and transmissive volume Bragg gratings.
光的传播路径为：泵浦光从谐振腔的侧端注入，并以布拉格角度入射到第一体布拉格光栅和第二体布拉格光栅并分别经第一体布拉格光栅和第二体布拉格光栅衍射，第一体布拉格光栅的衍射光进入第三体布拉格光栅，符合第三预设反射条件的衍射光由第三体布拉格光栅衍射(反射)，第三体布拉格光栅的衍射光沿第一体布拉格光栅的衍射光光路返回进入第一体布拉格光栅；第二体布拉格光栅的衍射光进入第四体布拉格光栅，符合第四预设反射条件的衍射光由第四体布拉格光栅衍射(反射)；第四体布拉格光栅的衍射光沿第二体布拉格光栅的衍射光光路返回进入第二体布拉格光栅；第一体布拉格光栅和第二体布拉格光栅分别对第三体布拉格光栅和第四体布拉格光栅返回的衍射光进行再次衍射后进入第三体布拉格光栅和第四体布拉格光栅，使光形成振荡，反射型布拉格光栅的透射光基于光栅的波长选择后输出。本实施例的泵浦光为辐射光。不符合第三预设反射条件和第四预设反射条件的衍射光分别被第三体布拉格光栅和第四体布拉格光栅过滤出双波长谐振腔。第一预设反射条件、第二预设反射条件、第三预设反射条件和第四预设反射条件均由对应的体布拉格光栅的波长选择参数确定。The propagation path of the light is as follows: the pump light is injected from the side end of the resonant cavity, and is incident on the first volume Bragg grating and the second volume Bragg grating at the Bragg angle and diffracted by the first volume Bragg grating and the second volume Bragg grating respectively, The diffracted light of the first volume Bragg grating enters the third volume Bragg grating, the diffracted light that meets the third preset reflection condition is diffracted (reflected) by the third volume Bragg grating, and the diffracted light of the third volume Bragg grating is along the first volume Bragg grating. The diffracted light path of the second volume Bragg grating returns to enter the first volume Bragg grating; the diffracted light of the second volume Bragg grating enters the fourth volume Bragg grating, and the diffracted light that meets the fourth preset reflection condition is diffracted (reflected) by the fourth volume Bragg grating; The diffracted light of the volume Bragg grating returns to enter the second volume Bragg grating along the diffracted light path of the second volume Bragg grating; The diffracted light enters the third volume Bragg grating and the fourth volume Bragg grating after re-diffraction, so that the light oscillates, and the transmitted light of the reflective Bragg grating is output based on the wavelength selection of the grating. The pump light in this embodiment is radiation light. The diffracted light that does not meet the third preset reflection condition and the fourth preset reflection condition is filtered out of the dual-wavelength resonator by the third volume Bragg grating and the fourth volume Bragg grating, respectively. The first preset reflection condition, the second preset reflection condition, the third preset reflection condition and the fourth preset reflection condition are all determined by wavelength selection parameters of the corresponding volume Bragg grating.
第一体布拉格光栅和第二体布拉格光栅的光栅周期相同，或者第一体布拉格光栅和第二体布拉格光栅的光栅厚度相同。The grating periods of the first volume Bragg grating and the second volume Bragg grating are the same, or the grating thicknesses of the first volume Bragg grating and the second volume Bragg grating are the same.
第三体布拉格光栅和第四体布拉格光栅的光栅周期相同，或者第三体布拉格光栅和第四体布拉格光栅的光栅厚度相同。The grating periods of the third volume Bragg grating and the fourth volume Bragg grating are the same, or the grating thicknesses of the third volume Bragg grating and the fourth volume Bragg grating are the same.
第一体布拉格光栅、第二体布拉格光栅、第三体布拉格光栅和第四体布拉格光栅均为均匀周期光栅且均为位相型体布拉格光栅，即第一体布拉格光栅和第二体布拉格光栅为位相型体布拉格光栅的透射型体布拉格光栅，第三体布拉 格光栅和第四体布拉格光栅为位相型体布拉格光栅的反射型体布拉格光栅，且第一体布拉格光栅、第二体布拉格光栅、第三体布拉格光栅和第四体布拉格光栅周期性均匀。The first volume Bragg grating, the second volume Bragg grating, the third volume Bragg grating, and the fourth volume Bragg grating are all uniform periodic gratings and are all phase-type volume Bragg gratings, that is, the first volume Bragg grating and the second volume Bragg grating are The transmission type volume Bragg grating of the phase type volume Bragg grating, the third volume Bragg grating and the fourth volume Bragg grating are the phase type volume Bragg grating reflection type volume Bragg grating, and the first volume Bragg grating, the second volume Bragg grating, the third volume Bragg grating The three-volume Bragg grating and the fourth volume Bragg grating are periodically uniform.
第三体布拉格光栅RVBG3与第一体布拉格光栅TVBG1之间的距离等于第四体布拉格光栅RVBG4与第二体布拉格光栅TVBG2之间的距离。两对体布拉格光栅的位置如图1所示，L 1+L 2＝L 1+L 3，并且第三体布拉格光栅和第四体布拉格光栅的放置位置能够使第一体布拉格光栅和第二体布拉格光栅的衍射光作为第三体布拉格光栅和第四体布拉格光栅的入射光分别入射到第三体布拉格光栅和第四体布拉格光栅，同时第三体布拉格光栅和第四体布拉格光栅的衍射光能够按照第一体布拉格光栅和第二体布拉格光栅的衍射光的路径原路返回。其中，L 1表示第一体布拉格光栅与第二体布拉格光栅之间的距离，L 2表示第一体布拉格光栅与第三体布拉格光栅之间的距离，L 3表示第二体布拉格光栅与第四体布拉格光栅之间的距离。 The distance between the third volume Bragg grating RVBG3 and the first volume Bragg grating TVBG1 is equal to the distance between the fourth volume Bragg grating RVBG4 and the second volume Bragg grating TVBG2. The positions of the two pairs of volume Bragg gratings are shown in FIG. 1 , L 1 +L 2 =L 1 +L 3 , and the placement positions of the third volume Bragg grating and the fourth volume Bragg grating enable the first volume Bragg grating and the second volume Bragg grating The diffracted light of the volume Bragg grating is incident on the third volume Bragg grating and the fourth volume Bragg grating as the incident light of the third volume Bragg grating and the fourth volume Bragg grating, and the diffraction of the third volume Bragg grating and the fourth volume Bragg grating is simultaneously The light can return to the original path according to the path of the diffracted light of the first volume Bragg grating and the second volume Bragg grating. Among them, L 1 represents the distance between the first volume Bragg grating and the second volume Bragg grating, L 2 represents the distance between the first volume Bragg grating and the third volume Bragg grating, and L 3 represents the second volume Bragg grating and the third volume Bragg grating. Distance between quad Bragg gratings.
双波长谐振腔还包括：激光增益物质；激光增益物质用于放大双波长谐振腔中的光。本实施例的第一体布拉格光栅、第二体布拉格光栅、第三体布拉格光栅和第四体布拉格光栅均位于同一种激光增益物质中。The dual-wavelength resonator further includes: a laser gain substance; the laser gain substance is used to amplify the light in the dual-wavelength resonator. The first volume Bragg grating, the second volume Bragg grating, the third volume Bragg grating and the fourth volume Bragg grating in this embodiment are all located in the same laser gain material.
激光增益物质采用掺钕钇铝石榴石(Nd：YAG)激光晶体或掺镱钇铝石榴石(Yb：YAG)激光晶体或其他激光晶体。The laser gain material adopts neodymium-doped yttrium aluminum garnet (Nd: YAG) laser crystal or ytterbium-doped yttrium aluminum garnet (Yb: YAG) laser crystal or other laser crystals.
体布拉格光栅由光致热敏折射率玻璃制成，光致热敏折射率玻璃为掺杂有铈、银以及氟的硅酸盐玻璃。The volume Bragg grating is made of photothermographic refractive index glass, which is a silicate glass doped with cerium, silver and fluorine.
本实施例的双波长谐振腔主要针对红外光进行腔内振荡。The dual-wavelength resonator of this embodiment mainly performs intracavity oscillation for infrared light.
第一体布拉格光栅、第二体布拉格光栅、第三体布拉格光栅和第四体布拉格光栅均具有优秀的角度选择性、波长选择性以及很高的衍射效率，被认为是理想的波长和角度选择器件，具有很高的可调性。体布拉格光栅的入射角、衍射角、中心波长和角度(光谱)选择性这些参数，可以通过改变体布拉格光栅的光栅厚度、折射率调制度、光栅周期和光栅矢量倾斜角这些光栅结构参数来进行调节。其中，入射角满足光栅布拉格角条件；衍射角满足布拉格条件：cos(φ-θ)＝K/β，其中φ为光栅矢量倾斜角，光栅矢量倾斜角φ控制在0°～90°，θ为入射光对应的入射角，K为光栅矢量，β为光栅内光的平均传播常数；中心 波长为400nm-2000nm，可调谐选择；光栅厚度大于0.5mm；光栅周期的范围为0.1微米～6微米；折射率调制度大于10ppm。光栅矢量倾斜角是指光栅条纹面垂直于入射面，并以φ角相对于介质边界倾斜的角度。The first volume Bragg grating, the second volume Bragg grating, the third volume Bragg grating and the fourth volume Bragg grating all have excellent angular selectivity, wavelength selectivity and high diffraction efficiency, and are considered to be ideal wavelength and angle selections device with high tunability. The parameters of the incident angle, diffraction angle, central wavelength, and angle (spectral) selectivity of the volume Bragg grating can be changed by changing the grating structure parameters of the volume Bragg grating, such as the grating thickness, the degree of refractive index modulation, the grating period and the grating vector tilt angle. adjust. Among them, the incident angle satisfies the grating Bragg angle condition; the diffraction angle satisfies the Bragg condition: cos(φ-θ)=K/β, where φ is the grating vector inclination angle, the grating vector inclination angle φ is controlled at 0°～90°, and θ is The incident angle corresponding to the incident light, K is the grating vector, and β is the average propagation constant of the light in the grating; the central wavelength is 400nm-2000nm, which can be tunable; the grating thickness is greater than 0.5mm; the range of the grating period is 0.1 μm to 6 μm; The degree of refractive index modulation is greater than 10 ppm. The grating vector inclination angle refers to the angle at which the grating fringe plane is perpendicular to the incident plane and is inclined relative to the medium boundary at an angle of φ.
第一体布拉格光栅、第二体布拉格光栅、第三体布拉格光栅和第四体布拉格光栅的优秀的光学性能主要表现在：The excellent optical properties of the first volume Bragg grating, the second volume Bragg grating, the third volume Bragg grating and the fourth volume Bragg grating are mainly manifested in:
(1)透射型体布拉格光栅的波长选择性达0.3nm～20nm，反射型体布拉格光栅的波长选择性达0.01nm～10nm；(1) The wavelength selectivity of the transmissive volume Bragg grating is 0.3nm～20nm, and the wavelength selectivity of the reflective volume Bragg grating is 0.01nm～10nm;
(2)透射型体布拉格光栅的角度选择性达0.1mrad～10mrad，反射型体布拉格光栅的角度选择性达10mrad～100mrad；(2) The angular selectivity of the transmissive volume Bragg grating is 0.1mrad～10mrad, and the angular selectivity of the reflective volume Bragg grating is 10mrad～100mrad;
(3)透射型体布拉格光栅的衍射效率在633nm到1550nm的波长范围内可达到99％，反射型体布拉格光栅的衍射效率在633nm到1550nm的波长范围内可达到97％，所以单个体布拉格光栅在633nm到1550nm的波长范围内的衍射效率高；(3) The diffraction efficiency of the transmissive volume Bragg grating can reach 99% in the wavelength range of 633nm to 1550nm, and the diffraction efficiency of the reflective volume Bragg grating can reach 97% in the wavelength range of 633nm to 1550nm, so a single volume Bragg grating can reach 97%. High diffraction efficiency in the wavelength range of 633nm to 1550nm;
(4)损伤阈值高，对于激光脉宽为1ns的YAG(yttrium aluminum garnet，钇铝石榴石)激光，损伤阈值可以达到7J/cm 2～10J/cm 2；对于激光脉宽为8ns～10ns的YAG激光损伤阈值可达30J/cm 2～40J/cm 2； (4) The damage threshold is high. For a YAG (yttrium aluminum garnet, yttrium aluminum garnet) laser with a laser pulse width of 1ns, the damage threshold can reach 7J/cm 2 ～10J/cm 2 ; for a laser pulse width of 8ns～10ns The damage threshold of YAG laser can reach 30J/cm 2 ～40J/cm 2 ;
(5)损耗小，体布拉格光栅的损耗小于2.5％。(5) The loss is small, and the loss of the volume Bragg grating is less than 2.5%.
体布拉格光栅具有极好的角度选择性和波长选择性，利用透射型体布拉格光栅的角度选择性和反射型体布拉格光栅的波长选择性的配合窄化光束带宽，通过调节透射型体布拉格光栅的角度选择性和反射型体布拉格光栅的波长选择性使波长带宽相交的部分可以产生小于或等于纵模间隔的光滤波器，选出所需纵模。正是由于透射型体布拉格光栅和反射型体布拉格光栅的组合结构构成的窄带滤波器能够进行纵模选择，所以透射型体布拉格光栅和反射型体布拉格光栅的组合结构可以作为双波长谐振腔。Volume Bragg gratings have excellent angular selectivity and wavelength selectivity. By combining the angle selectivity of transmissive volume Bragg gratings and the wavelength selectivity of reflective volume Bragg gratings to narrow the beam bandwidth, by adjusting the The angle selectivity and the wavelength selectivity of the reflective volume Bragg grating allow the intersection of the wavelength bandwidths to generate an optical filter with a spacing less than or equal to the longitudinal mode to select the desired longitudinal mode. It is precisely because the narrow-band filter composed of the combined structure of the transmissive volume Bragg grating and the reflective volume Bragg grating can perform longitudinal mode selection, the combined structure of the transmissive volume Bragg grating and the reflective volume Bragg grating can be used as a dual-wavelength resonator.
根据体布拉格光栅衍射理论，体布拉格光栅的衍射特性与光栅周期、光栅厚度以及折射率调制度密切相关，双波长激光器的工作波长与光栅周期对应，且满足布拉格条件，光栅厚度与折射率调制度相互匹配实现体布拉格光栅具有特定衍射效率和光谱选择性。一般地，对于透射型体布拉格光栅，其衍射效率随光栅厚度与折射率调制度的乘积增大而且在0％～100％范围内呈周期性变 化，其光谱选择性随光栅厚度和折射率调制度的增大而减小；对于反射型体布拉格光栅，其衍射效率随光栅厚度与折射率调制度的乘积增大不断增大，最终趋于100％，其光谱选择性随光栅厚度和折射率调制度的增大而减小。According to the diffraction theory of volume Bragg grating, the diffraction characteristics of volume Bragg grating are closely related to the grating period, grating thickness and refractive index modulation. Matching each other achieves volume Bragg gratings with specific diffraction efficiency and spectral selectivity. Generally, for a transmissive volume Bragg grating, the diffraction efficiency increases with the product of the grating thickness and the refractive index modulation degree and changes periodically in the range of 0% to 100%, and its spectral selectivity varies with the grating thickness and refractive index modulation. The diffraction efficiency increases with the increase of the grating thickness and the refractive index modulation degree, and finally tends to 100%, and the spectral selectivity varies with the grating thickness and refractive index. The modulation degree increases and decreases.
图3为在入射波长为1064nm，光栅厚度d分别为2.5mm和3.5mm时，第一体布拉格光栅或第二体布拉格光栅的角度选择性模拟曲线图。图3中第一体布拉格光栅或第二体布拉格光栅的参数为：布拉格波长为1064nm，光栅周期为3μm，光栅矢量倾斜角为90°。当波长一定时，体布拉格光栅的入射光束不满足布拉格条件，即偏离布拉格角，此时体布拉格光栅具有角度选择性。FIG. 3 is a simulation graph of the angle selectivity of the first volume Bragg grating or the second volume Bragg grating when the incident wavelength is 1064 nm and the grating thickness d is 2.5 mm and 3.5 mm, respectively. The parameters of the first volume Bragg grating or the second volume Bragg grating in FIG. 3 are: the Bragg wavelength is 1064 nm, the grating period is 3 μm, and the grating vector tilt angle is 90°. When the wavelength is constant, the incident beam of the volume Bragg grating does not satisfy the Bragg condition, that is, it deviates from the Bragg angle. At this time, the volume Bragg grating has angular selectivity.
图4为在入射波长为1064nm，光栅周期Λ分别为2μm和3μm时，第一体布拉格光栅或第二体布拉格光栅的角度选择性模拟曲线图。图4中第一体布拉格光栅或第二体布拉格光栅的参数为：布拉格波长为1064nm，光栅厚度为2.5mm，光栅矢量倾斜角为90°。FIG. 4 is a simulation graph of the angle selectivity of the first volume Bragg grating or the second volume Bragg grating when the incident wavelength is 1064 nm and the grating period Λ is 2 μm and 3 μm, respectively. The parameters of the first volume Bragg grating or the second volume Bragg grating in FIG. 4 are: the Bragg wavelength is 1064 nm, the grating thickness is 2.5 mm, and the grating vector inclination angle is 90°.
图5为在入射波长为1064nm，光栅厚度d分别为4mm和5mm时，第三体布拉格光栅和第四体布拉格光栅的波长选择性模拟曲线图。图5中第三体布拉格光栅或第四体布拉格光栅的参数为：布拉格波长为1064nm，光栅周期为0.6μm，光栅矢量倾斜角为90°。FIG. 5 is a graph showing the wavelength selectivity of the third volume Bragg grating and the fourth volume Bragg grating when the incident wavelength is 1064 nm and the grating thickness d is 4 mm and 5 mm, respectively. The parameters of the third volume Bragg grating or the fourth volume Bragg grating in FIG. 5 are: the Bragg wavelength is 1064 nm, the grating period is 0.6 μm, and the grating vector tilt angle is 90°.
图6为在入射波长为1064nm，光栅周期Λ分别为0.5μm和0.6μm时，第三体布拉格光栅和第四体布拉格光栅的波长选择性模拟曲线图。图6中第三体布拉格光栅或第四体布拉格光栅的参数为：布拉格波长为1064nm，光栅厚度为5mm，光栅矢量倾斜角为90°。6 is a graph showing the wavelength selectivity of the third volume Bragg grating and the fourth volume Bragg grating when the incident wavelength is 1064 nm and the grating period Λ is 0.5 μm and 0.6 μm, respectively. The parameters of the third volume Bragg grating or the fourth volume Bragg grating in FIG. 6 are: the Bragg wavelength is 1064 nm, the grating thickness is 5 mm, and the grating vector inclination angle is 90°.
图7为在入射波长为1064nm时，本发明双波长谐振腔输出的双波长的曲线示意图，使用半峰全宽表示输出波长的宽度，双波长输出的半峰全宽均为0.5nm，曲线1表示中心波长为1063.2nm的输出波长，曲线2表示中心波长为1064.8nm的输出波长。7 is a schematic diagram of a dual-wavelength curve output by a dual-wavelength resonator of the present invention when the incident wavelength is 1064 nm, the full width at half maximum is used to represent the width of the output wavelength, and the full width at half maximum of the dual-wavelength output is both 0.5 nm, curve 1 It represents the output wavelength with the center wavelength of 1063.2nm, and the curve 2 represents the output wavelength with the center wavelength of 1064.8nm.
本发明采用两对体布拉格光栅的谐振腔结构，在两个方向上同时输出激光，结构简单，容易实现；通过调整体布拉格光栅的光栅结构参数可以实现第一体布拉格光栅输出的波长与第二体布拉格光栅输出的波长的波长差为几纳米甚至更低的双波长双端输出，同时通过体布拉格光栅滤除光束中的中高频成份以及波前优化可对输出光束质量进行优化，扩展了双波长激光器的光学谐振 腔的设计领域；通过透射型体布拉格光栅和反射型体布拉格光栅的组合结构，且控制各体布拉格光栅的结构参数(厚度和周期)，实现透射型体布拉格光栅的角度选择性和反射型体布拉格光栅的波长选择性的配合窄化光束带宽；简化了纵模激光器的结构，提高了抗干扰能力具有大功率输出的潜能；透射型体布拉格光栅的角度选择性可限制腔内的光束发散角，利于实现大横模直径和大能量的输出。另外本发明采用光致热敏折射率玻璃作为制备光栅的材料，可承载的激光功率高；且不改变辐射光的偏振态，稳定性好和抗干扰能力强使得体布拉格光栅受温度影响小，损耗小且损伤阈值高。The invention adopts the resonant cavity structure of two pairs of volume Bragg gratings, outputs laser light in two directions at the same time, has a simple structure and is easy to implement; by adjusting the grating structure parameters of the volume Bragg grating, the output wavelength of the first volume Bragg grating and the second volume can be realized. The wavelength difference of the output wavelength of the volume Bragg grating is a few nanometers or even lower, and the output beam quality can be optimized by filtering out the middle and high frequency components in the beam and optimizing the wavefront through the volume Bragg grating. The design field of the optical resonator of the wavelength laser; through the combined structure of the transmissive volume Bragg grating and the reflective volume Bragg grating, and controlling the structural parameters (thickness and period) of each volume Bragg grating, the angle selection of the transmissive volume Bragg grating is realized The combination of wavelength selectivity and wavelength selectivity of reflective volume Bragg gratings narrows the beam bandwidth; simplifies the structure of longitudinal mode lasers, improves anti-interference ability, and has the potential for high power output; the angular selectivity of transmissive volume Bragg gratings can limit the cavity The inner beam divergence angle is conducive to the realization of large transverse mode diameter and large energy output. In addition, the invention adopts photothermographic refractive index glass as the material for preparing the grating, which can carry high laser power; and does not change the polarization state of the radiated light, has good stability and strong anti-interference ability, so that the volume Bragg grating is less affected by temperature, Low losses and high damage threshold.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.
本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处。综上所述，本说明书内容不应理解为对本发明的限制。In this paper, specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present invention; meanwhile, for those skilled in the art, according to the present invention There will be changes in the specific implementation and application scope. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (7)

  1. 一种基于体布拉格光栅的双波长谐振腔，其特征在于，包括：第一对体布拉格光栅和第二对体布拉格光栅；所述第一对体布拉格光栅包括第一体布拉格光栅和第三体布拉格光栅，所述第二对体布拉格光栅包括第二体布拉格光栅和第四体布拉格光栅；A dual-wavelength resonant cavity based on volume Bragg grating is characterized by comprising: a first pair of volume Bragg gratings and a second pair of volume Bragg gratings; the first pair of volume Bragg gratings comprises a first volume Bragg grating and a third volume Bragg grating Bragg gratings, the second pair of volume Bragg gratings includes a second volume Bragg grating and a fourth volume Bragg grating;
    所述第一体布拉格光栅和所述第二体布拉格光栅均位于泵浦光的出射光路上；Both the first volume Bragg grating and the second volume Bragg grating are located on the outgoing optical path of the pump light;
    所述第一体布拉格光栅与所述第二体布拉格光栅间隔设置，且所述泵浦光位于所述第一体布拉格光栅所处平面与所述第二体布拉格光栅所处平面之间；the first volume Bragg grating and the second volume Bragg grating are arranged at intervals, and the pump light is located between the plane where the first volume Bragg grating is located and the plane where the second volume Bragg grating is located;
    所述第三体布拉格光栅位于所述第一体布拉格光栅的衍射光路上；所述第三体布拉格光栅所处平面与所述第一体布拉格光栅所处平面的夹角为第一预设角度，且所述第三体布拉格光栅的反射光光路与所述第一体布拉格光栅的衍射光光路重合；The third volume Bragg grating is located on the diffraction light path of the first volume Bragg grating; the angle between the plane where the third volume Bragg grating is located and the plane where the first volume Bragg grating is located is a first preset angle , and the reflected light path of the third volume Bragg grating coincides with the diffracted light path of the first volume Bragg grating;
    所述第四体布拉格光栅位于所述第二体布拉格光栅的衍射光路上；所述第四体布拉格光栅所处平面与所述第二体布拉格光栅所处平面的夹角为第二预设角度，且所述第四体布拉格光栅的反射光光路与所述第二体布拉格光栅的衍射光光路重合；The fourth volume Bragg grating is located on the diffraction light path of the second volume Bragg grating; the included angle between the plane where the fourth volume Bragg grating is located and the plane where the second volume Bragg grating is located is a second preset angle , and the reflected light path of the fourth volume Bragg grating coincides with the diffracted light path of the second volume Bragg grating;
    所述第一体布拉格光栅用于输出符合所述第一体布拉格光栅的第一预设透射条件的光，以及衍射未符合所述第一预设透射条件的光；The first volume Bragg grating is used for outputting light that meets a first preset transmission condition of the first volume Bragg grating, and diffracting light that does not meet the first preset transmission condition;
    所述第二体布拉格光栅用于输出符合所述第二体布拉格光栅的第二预设透射条件的光，以及衍射未符合所述第二预设透射条件的光；The second volume Bragg grating is configured to output light that meets the second preset transmission condition of the second volume Bragg grating, and diffract light that does not meet the second preset transmission condition;
    所述第三体布拉格光栅用于反射符合所述第三体布拉格光栅的第三预设反射条件的光；the third volume Bragg grating is used for reflecting light that meets the third preset reflection condition of the third volume Bragg grating;
    所述第四体布拉格光栅用于反射符合所述第四体布拉格光栅的第四预设反射条件的光。The fourth volume Bragg grating is used for reflecting light that meets a fourth preset reflection condition of the fourth volume Bragg grating.
  2. 根据权利要求1所述的基于体布拉格光栅的双波长谐振腔，其特征在于，所述第一体布拉格光栅和所述第二体布拉格光栅均为透射型体布拉格光栅；The volume Bragg grating-based dual-wavelength resonant cavity according to claim 1, wherein the first volume Bragg grating and the second volume Bragg grating are both transmissive volume Bragg gratings;
    所述第三体布拉格光栅和所述第四体布拉格光栅均为反射型体布拉格光栅。The third volume Bragg grating and the fourth volume Bragg grating are both reflective volume Bragg gratings.
  3. 根据权利要求1所述的基于体布拉格光栅的双波长谐振腔，其特征在于，所述第一体布拉格光栅和所述第二体布拉格光栅的光栅周期相同。The volume Bragg grating-based dual-wavelength resonant cavity according to claim 1, wherein the grating periods of the first volume Bragg grating and the second volume Bragg grating are the same.
  4. 根据权利要求1所述的基于体布拉格光栅的双波长谐振腔，其特征在于，所述第三体布拉格光栅和所述第四体布拉格光栅的光栅周期相同。The volume Bragg grating-based dual-wavelength resonant cavity according to claim 1, wherein the grating periods of the third volume Bragg grating and the fourth volume Bragg grating are the same.
  5. 根据权利要求1所述的基于体布拉格光栅的双波长谐振腔，其特征在于，所述第一体布拉格光栅和所述第二体布拉格光栅的光栅厚度相同。The volume Bragg grating-based dual-wavelength resonant cavity according to claim 1, wherein the grating thicknesses of the first volume Bragg grating and the second volume Bragg grating are the same.
  6. 根据权利要求1所述的基于体布拉格光栅的双波长谐振腔，其特征在于，所述第三体布拉格光栅和所述第四体布拉格光栅的光栅厚度相同。The volume Bragg grating-based dual-wavelength resonant cavity according to claim 1, wherein the third volume Bragg grating and the fourth volume Bragg grating have the same grating thickness.
  7. 根据权利要求1所述的基于体布拉格光栅的双波长谐振腔，其特征在于，所述第三体布拉格光栅与所述第一体布拉格光栅之间的距离等于所述第四体布拉格光栅与所述第二体布拉格光栅之间的距离。The dual-wavelength resonant cavity based on volume Bragg grating according to claim 1, wherein the distance between the third volume Bragg grating and the first volume Bragg grating is equal to the distance between the fourth volume Bragg grating and the third volume Bragg grating the distance between the second volume Bragg gratings.
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