CN116316028A - Crystal Q-switched solid laser with 3 kinds of wavelength conversion - Google Patents

Crystal Q-switched solid laser with 3 kinds of wavelength conversion Download PDF

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CN116316028A
CN116316028A CN202310278602.2A CN202310278602A CN116316028A CN 116316028 A CN116316028 A CN 116316028A CN 202310278602 A CN202310278602 A CN 202310278602A CN 116316028 A CN116316028 A CN 116316028A
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wavelength
laser
light
crystal
polarization spectroscope
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吴梦瑶
李香蓉
赵晓林
冯国强
梁化梅
吴雨涵
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Air Force Engineering University of PLA
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Air Force Engineering University of PLA
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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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • H01S3/109—Frequency multiplication, e.g. harmonic generation
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1123—Q-switching
    • H01S3/1127—Q-switching using pulse transmission mode [PTM]
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1123—Q-switching
    • H01S3/117—Q-switching using intracavity acousto-optic devices
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1123—Q-switching
    • H01S3/121—Q-switching using intracavity mechanical devices
    • H01S3/123—Q-switching using intracavity mechanical devices using rotating mirrors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention provides a crystal Q-switched solid laser with 3 kinds of wavelength conversion, which belongs to the technical field of lasers and comprises the following components: gold plating total reflection mirror; the pulse laser output module is arranged behind the gold-plated total reflection mirror and is used for outputting pump light; a first wavelength laser output module, comprising: a linear polarizer, a second polarizing beam splitter, a third polarizing beam splitter, and a passive Q-switched crystal; a second wavelength laser output module, comprising: the second electric control optical rotatory device, the acousto-optic modulator, the first polarization spectroscope, the frequency doubling crystal and the output mirror; a third wavelength laser output module, comprising: the device comprises a first electric control rotator, a fourth polarization spectroscope, an optical parametric oscillation crystal and a front part of the fourth polarization spectroscope. The device can switch and output pulse lasers with different wavelengths.

Description

Crystal Q-switched solid laser with 3 kinds of wavelength conversion
Technical Field
The invention belongs to the technical field of lasers, and particularly relates to a crystal Q-switched solid laser with 3 kinds of wavelength conversion.
Background
Laser is widely applied to various fields such as optical medical treatment, industrial finish machining, environment monitoring, laser remote sensing, laser communication and the like by the characteristics of high brightness, high directivity, high monochromaticity and high coherence. The multi-wavelength pulse laser is one of the hot topics at home and abroad in recent years, and has important roles in the military application fields such as laser investigation countermeasure, laser ranging, laser radar, laser guidance, laser weapon and the like.
The existing method for realizing multi-wavelength laser output comprises the steps of outputting fundamental frequency light of a laser operated by fixed wavelength and frequency conversion light thereof simultaneously, and realizing dual-wavelength or multi-wavelength operation by utilizing a frequency selection device based on light emitted by a laser of a broadband emission spectrum of a laser medium.
However, both of these methods, while more sophisticated, yield laser outputs that are doped with wavelengths other than those required, and yield lower energy multi-wavelength outputs. Meanwhile, different frequency selecting devices and optical elements are adopted, so that the resonant cavity has a complex structure and limited application scenes. In order to suppress unwanted spectral line oscillations, not only is it necessary to increase the intra-cavity loss of unwanted spectral lines using a multi-cavity mirror structure, but also an etalon is sometimes inserted into the cavity to filter out unwanted spectral lines.
In summary, the multi-wavelength solid-state laser in the prior art generally has the problems of large volume, too complex system and incapability of rapidly switching and outputting a single wavelength, so that the multi-wavelength solid-state laser cannot be applied to an actual battlefield.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a crystal Q-switched solid laser with 3 kinds of wavelength conversion.
In order to achieve the above object, the present invention provides the following technical solutions:
a crystalline Q-switched solid state laser with 3 wavelength conversions, comprising:
gold plating total reflection mirror;
the pulse laser output module is arranged behind the gold-plated total reflection mirror and is used for outputting pumping light;
a first wavelength laser output module, comprising:
the linear polaroid is arranged behind the pulse laser output module; the second polarization spectroscope is arranged behind the linear polaroid and forms an included angle of-45 degrees with the yOz plane; the third polarization spectroscope is arranged behind the second polarization spectroscope and forms an included angle of +45 degrees with the yOz plane; the passive Q-switched crystal is arranged behind the third polarization spectroscope;
a second wavelength laser output module, comprising:
the second electric control optical rotator is arranged between the second polarization spectroscope and the third polarization spectroscope;
the acousto-optic modulator is arranged between the linear polaroid and the pulse laser output module;
the first polarization spectroscope is arranged above the third polarization spectroscope, and the included angle between the first polarization spectroscope and the yOz plane is-45 degrees; the frequency doubling crystal is arranged in front of the first polarization spectroscope;
an output mirror disposed behind the first polarizing beamsplitter;
a third wavelength laser output module, comprising:
the first electric control rotator is arranged behind the linear polaroid; the fourth polarization spectroscope is arranged below the second polarization spectroscope, and the included angle between the fourth polarization spectroscope and the yOz plane is +45 degrees; the optical parametric oscillation crystal is arranged in front of the fourth polarization spectroscope;
when the acousto-optic modulator is closed, the first electric control optical rotatory device is closed, the second electric control optical rotatory device is closed, the oscillation light output by the pulse laser output module is changed into linear polarization light polarized along the x-axis through the linear polarization plate, after passing through the second polarization spectroscope and the third polarization spectroscope in succession, the passive Q adjustment is carried out through the passive Q adjustment crystal, the oscillation light is partially transmitted by the dielectric film layer plated at the rear end of the crystal, the reflected oscillation light returns to reach the pulse laser output module, the light is emitted to the right end of the gold-plated total reflection mirror after passing through the pulse laser output module, the full reflection is carried out to the pulse laser output module, one round trip in the laser resonant cavity is completed, and the oscillation light outputs low-repetition-frequency pulse laser with the first wavelength after a plurality of round trips in the imaging resonant cavity;
when the first electric control rotator is closed, the oscillation light output by the pulse laser output module is changed into high-repetition frequency oscillation light through the acousto-optic modulator, the high-repetition frequency oscillation light is changed into linear polarization polarized along the x-axis through the linear polarizer, the linear polarization polarized along the x-axis is changed into linear polarization polarized along the y-axis after passing through the second polarization spectroscope and the second electric control rotator, the linear polarization polarized along the x-axis is totally reflected to the lower end face of the first polarization spectroscope after passing through the third polarization spectroscope, and then totally reflected by the first polarization spectroscope P1, the fundamental frequency light with the second wavelength and the light with the first wavelength are obtained through the frequency doubling crystal, the light with the second wavelength is reflected through the gold-plated total reflection mirror, the laser with the second wavelength is transmitted through the first polarization spectroscope and then output through the output mirror, the laser with the first wavelength is returned to the pulse laser output module along the original optical path after passing through the pulse laser output module, the right end of the total reflection mirror is totally reflected to the pulse laser output module, and the oscillation light with the second wavelength is repeatedly reflected back and forth to the pulse laser output in the resonant cavity for multiple times after the oscillation light with the second wavelength is in the resonant cavity;
when the acousto-optic modulator is closed, the second electric control rotator is closed, the oscillating light with the first wavelength output by the pulse laser output module is changed into linear polarized light polarized along the x axis through the linear polarizing plate, the linear polarized light polarized along the x axis is changed into linear polarized light polarized along the y axis after passing through the first electric control rotator, the linear polarized light is totally reflected to the upper end face of the fourth polarizing spectroscope after passing through the second polarizing spectroscope, then is totally reflected by the fourth polarizing spectroscope, the oscillating light with the third wavelength and the fundamental frequency light with the first wavelength are obtained through the optical parametric oscillation crystal, the light beams with the two wavelengths are reflected through the gold-plated total reflection mirror, the light with the third wavelength is transmitted by the fourth polarizing spectroscope and then output, the laser with the first wavelength is returned to the original light path after being totally reflected by the fourth polarizing spectroscope and reaches the pulse laser output module, the light is totally reflected to the right end of the gold-plated total reflection mirror and then is returned to the pulse laser output module, and the oscillating light with the third wavelength is repeatedly transmitted back and forth in the laser cavity after passing through the pulse laser output module, and the imaging resonant cavity is completed.
Further, the pulse laser output module includes: the laser pumping module is arranged behind the gold-plated total reflection mirror;
the gain medium is arranged behind the laser pumping module;
further, the gain medium is Nd: YAG crystals.
Further, the laser pumping module includes: the laser pumping source is a quasi-continuous laser diode with the center wavelength of nanometers and is used for carrying out end-face pumping on the laser gain medium;
further, the upper end face of the gold-plated total reflection mirror is plated with a medium film which is completely transparent to the first wavelength, and the lower end face is plated with a medium film which is completely reflective to the pumping wavelength and is completely transparent to the first wavelength.
Further, the frequency doubling crystal is one of potassium dihydrogen phosphate, lithium niobate, beta-phase barium metaborate, potassium titanyl phosphate and polarized lithium niobate crystal.
Further, the optical parametric oscillation crystal is a KTP crystal.
Further, the passive Q-switched crystal is a Cr3+ YAG crystal.
Further, the first electric control rotator comprises an electro-optical crystal and a driving power supply, and the laser wavelength output by the driving power supply is selected.
The crystal Q-switched solid laser with 3 wavelength conversions has the following beneficial effects:
when the acousto-optic modulator is closed, the first electric control optical rotatory device is closed, the second electric control optical rotatory device is closed, the oscillation light output by the pulse laser output module is changed into linear polarization light polarized along the x-axis through the linear polarization plate, after passing through the second polarization spectroscope and the third polarization spectroscope in succession, the passive Q adjustment is carried out through the passive Q adjustment crystal, the oscillation light is partially transmitted by the dielectric film layer plated at the rear end of the crystal, the reflected oscillation light returns to reach the pulse laser output module, the light is emitted to the right end of the gold-plated total reflection mirror after passing through the pulse laser output module, the full reflection is carried out to the pulse laser output module, one round trip in the laser resonant cavity is completed, and the oscillation light outputs low-repetition-frequency pulse laser with the first wavelength after a plurality of round trips in the imaging resonant cavity;
when the first electric control rotator is closed, the oscillation light output by the pulse laser output module is changed into high-repetition frequency oscillation light through the acousto-optic modulator, the high-repetition frequency oscillation light is changed into linear polarization polarized along the x-axis through the linear polarizer, the linear polarization polarized along the x-axis is changed into linear polarization polarized along the y-axis after passing through the second polarization spectroscope and the second electric control rotator, the linear polarization polarized along the x-axis is totally reflected to the lower end face of the first polarization spectroscope after passing through the third polarization spectroscope, and then totally reflected by the first polarization spectroscope P1, the fundamental frequency light with the second wavelength and the light with the first wavelength are obtained through the frequency doubling crystal, the light with the second wavelength is reflected through the gold-plated total reflection mirror, the laser with the second wavelength is transmitted through the first polarization spectroscope and then output through the output mirror, the laser with the first wavelength is returned to the pulse laser output module along the original optical path after passing through the pulse laser output module, the right end of the total reflection mirror is totally reflected to the pulse laser output module, and the oscillation light with the second wavelength is repeatedly reflected back and forth to the pulse laser output in the resonant cavity for multiple times after the oscillation light with the second wavelength is in the resonant cavity;
when the acousto-optic modulator is closed, the second electric control rotator is closed, the oscillating light with the first wavelength output by the pulse laser output module is changed into linear polarized light polarized along the x axis through the linear polarizing plate, the linear polarized light polarized along the x axis is changed into linear polarized light polarized along the y axis after passing through the first electric control rotator, the linear polarized light is totally reflected to the upper end face of the fourth polarizing spectroscope after passing through the second polarizing spectroscope, then is totally reflected by the fourth polarizing spectroscope, the oscillating light with the third wavelength and the fundamental frequency light with the first wavelength are obtained through the optical parametric oscillation crystal, the light beams with the two wavelengths are reflected through the gold-plated total reflection mirror, the light with the third wavelength is transmitted by the fourth polarizing spectroscope and then output, the laser with the first wavelength is returned to the original light path after being totally reflected by the fourth polarizing spectroscope and reaches the pulse laser output module, the light is totally reflected to the right end of the gold-plated total reflection mirror and then is returned to the pulse laser output module, and the oscillating light with the third wavelength is repeatedly transmitted back and forth in the laser cavity after passing through the pulse laser output module, and the imaging resonant cavity is completed.
Drawings
In order to more clearly illustrate the embodiments of the present invention and the design thereof, the drawings required for the embodiments will be briefly described below. The drawings in the following description are only some of the embodiments of the present invention and other drawings may be made by those skilled in the art without the exercise of inventive faculty.
Fig. 1 is a schematic structural diagram of a crystal Q-switched solid laser with 3 wavelength conversion according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of an optical path structure for outputting a first wavelength laser according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an optical path structure for outputting a second wavelength laser according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an optical path structure for outputting a laser beam with a third wavelength according to an embodiment of the present invention.
Reference numerals illustrate:
1-gold-plated total reflection mirror; 2-laser pumping mode; a 3-gain medium; 4-an acousto-optic modulator; 5-linear polarizer; 6-a passive Q-switched crystal; 7-frequency doubling crystals; 8-an output mirror; 9-an optical parametric oscillation crystal; p1-a first polarizing beamsplitter; p2-a second polarizing beamsplitter; p3-a third polarizing beamsplitter; p4-fourth polarizing beamsplitter; d1-a first electrically controlled optical rotatory plate; d2-a second electric control optical rotator.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the embodiments, so that those skilled in the art can better understand the technical scheme of the present invention and can implement the same. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the technical solutions of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly specified or limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more, and will not be described in detail herein.
Examples:
the invention provides a crystal Q-switched solid laser with 3 kinds of wavelength conversion, which is shown in figures 1-4 in detail and comprises: gold-plated total reflection mirror 1; the pulse laser output module is arranged behind the gold-plated total reflection mirror 1 and is used for outputting pumping light; a first wavelength laser output module, comprising: a linear polarizer 5 arranged behind the pulse laser output module; the second polarization spectroscope P2 is arranged behind the linear polaroid 5 and forms an included angle of-45 degrees with the yOz plane; the third polarization spectroscope P3 is arranged behind the second polarization spectroscope P2 and forms an included angle of +45 degrees with the yOz plane; and the passive Q-switched crystal 6 is arranged behind the third polarization spectroscope.
A second wavelength laser output module, comprising: the second electric control optical rotator D2 is arranged between the second polarization spectroscope P2 and the third polarization spectroscope P3; an acousto-optic modulator 4 disposed between the linear polarizer 5 and the pulse laser output module; the first polarization spectroscope P1 is arranged above the third polarization spectroscope P3, and the included angle between the first polarization spectroscope P1 and the yOz plane is-45 degrees; a frequency doubling crystal 7 arranged in front of the first polarization beam splitter P1; an output mirror 8 disposed behind the first polarizing beam splitter
A third wavelength laser output module, comprising:
the first electric control rotator D1 is arranged behind the linear polaroid 5; a fourth polarization beam splitter P4, disposed below the second polarization beam splitter P2, and having an included angle of +45 degrees with the yOz plane; and the optical parametric oscillation crystal 9 is arranged in front of the fourth polarization spectroscope.
Specifically, in the present embodiment:
specifically, the laser pumping module comprises a laser pumping source and a plane reflecting mirror, wherein the laser pumping source comprises a continuous/quasi-continuous/pulsed laser diode and is used for outputting pumping light with pumping wavelength to excite a laser gain medium, and the plane reflecting mirror can adopt a side pumping or end pumping mode, and has an included angle of +45 degrees with the xOz plane where three light paths are positioned and is used for guiding the pumping light into the light paths;
preferably, the laser pumping source adopts quasi-continuous pumping and adopts an end-face pumping mode;
preferably, the upper end surface of the plane reflecting mirror is plated with a medium film which is completely transparent to the first wavelength, and the lower end surface is plated with a medium film which is completely reflective to the pumping wavelength and completely transparent to the first wavelength;
specifically, the gain medium can be any medium capable of generating laser, including a monocrystalline gain medium, a laser ceramic gain medium, a laser glass gain medium and the like;
preferably, the gain medium adopts Nd: YAG crystals for realizing the output of pulse laser with a first wavelength;
specifically, the imaging structure resonant cavity comprises a straight cavity structure, an annular cavity structure and an inner cavity structure, wherein the straight cavity structure is used for obtaining a first wavelength light beam, the annular cavity structure is used for obtaining a second wavelength light beam after passing through a frequency doubling crystal, the inner cavity structure is used for obtaining a third wavelength light beam after optical parametric oscillation, and the imaging structure resonant cavity adopts a uniform gold-plated total reflection mirror as an input mirror to realize total reflection effects on various wavelengths;
specifically, the Q-switching module comprises an acousto-optic modulator and a passive Q-switching crystal, and pulse lasers with different repetition frequencies can be obtained by controlling the incident ultrasonic power of the acousto-optic modulator and utilizing the imaging structure resonant cavity according to different Q-switching modes corresponding to lasers with different wavelengths;
preferably, the acousto-optic modulator is used for outputting laser pulses of a high repetition frequency second wavelength;
preferably, the passive Q-switching crystal adopts Cr3+ YAG crystal to realize Q-switching of oscillating light with a first wavelength, and a dielectric film layer with the reflectivity of more than or equal to 80% for the first wavelength is plated at the right end of the crystal to be used as an output mirror with a straight cavity structure;
specifically, the frequency doubling crystal can be any nonlinear optical crystal used for frequency doubling effect to realize wavelength conversion of oscillating light, and is any one of potassium dihydrogen phosphate (KDP), lithium niobate, beta-phase barium metaborate (BBO), potassium titanyl phosphate (KTP) and polarized lithium niobate (PPLN) crystals;
preferably, the frequency doubling crystal adopts a KDP crystal to realize nonlinear transformation of the first wavelength and realize pulse laser output of the second wavelength;
specifically, the polarizing spectroscope comprises a first polarizing spectroscope, a second polarizing spectroscope, a third polarizing spectroscope and a fourth polarizing spectroscope, wherein two end surfaces of the polarizing spectroscope are respectively plated with dielectric film layers with different reflectivities aiming at different wavelengths, and the dielectric film layers are used for transmitting or reflecting light beams with different wavelengths or different polarization states, so that the light paths of the wavelengths after passing through the different polarizing spectroscopes are different, and the condition that a laser only outputs pulse laser with one wavelength is met;
specifically, the included angle between the first polarization spectroscope and the yOz plane is-45 degrees, the included angle between the second polarization spectroscope and the yOz plane is-45 degrees, the included angle between the third polarization spectroscope and the yOz plane is +45 degrees, the included angle between the fourth polarization spectroscope and the yOz plane is +45 degrees, the first polarization spectroscope and the third polarization spectroscope are aligned in parallel along the x-axis direction, the second polarization spectroscope and the fourth polarization spectroscope are aligned in parallel along the x-axis direction, and the second polarization spectroscope and the third polarization spectroscope are aligned in parallel along the z-axis;
preferably, the lower end surface of the first polarization spectroscope is plated with a light total reflection film which polarizes the first wavelength along the y-axis direction, and the upper end surface is plated with a light total transmission film layer which polarizes the second wavelength;
preferably, the lower end surface of the second polarization spectroscope is plated with a full-transmission film for polarized light of the first wavelength along the x-axis direction, and the upper side is plated with a full-transmission film layer for light of the first wavelength;
preferably, the lower end surface of the third polarization spectroscope is plated with a light full-transmission film for the first wavelength, the upper end surface is plated with a light full-reflection film for the first wavelength polarized along the y-axis direction, and a light full-transmission film layer for the first wavelength polarized along the x-axis direction;
preferably, a light total reflection film which polarizes the first wavelength along the y-axis direction and a light total transmission film layer which transmits the third wavelength are plated above the fourth polarization spectroscope;
specifically, a linear polarizer is used for changing the fundamental frequency oscillation light into linear polarization;
specifically, the electric control optical rotator module comprises a first electric control optical rotator and a second electric control optical rotator, wherein the electric control optical rotator comprises an electro-optic crystal and a driving power supply, and the laser wavelength output by the driving power supply is selected through control;
specifically, the optical parametric oscillation crystal is used for optical parametric oscillation effect, the optical parametric oscillation crystal outputs the pulse with the third wavelength, and the basic requirement of the optical parametric oscillation crystal is the same as that of the frequency doubling crystal;
preferably, the optical parametric oscillation crystal adopts a KTP crystal to realize nonlinear transformation of the first wavelength and realize pulse laser output of the third wavelength.
Based on the technical scheme, a light path formed by the laser pumping source, the gain medium, the linear polaroid, the second polarization spectroscope, the fourth polarization spectroscope and the passive Q-switched crystal and used for transmitting the light beam with the first wavelength is a first light path;
the optical path formed by the laser pumping source, the gain medium, the acousto-optic modulator, the linear polaroid, the second polarization spectroscope, the second electric control rotator, the fourth polarization spectroscope and the first polarization spectroscope and used for transmitting the second wavelength light beam is a second optical path, and the optical path formed by the laser pumping source, the gain medium, the linear polaroid, the first electric control rotator, the second polarization spectroscope, the optical parametric oscillation crystal and the fourth polarization spectroscope and used for transmitting the third wavelength light beam is a third optical path.
The following are specific embodiments of the present invention:
referring to fig. 1, the embodiment of the invention provides a multi-wavelength solid laser, which comprises a laser pumping module, a plane reflector, a gain medium, an imaging structure resonant cavity, a Q-switched module, a frequency doubling crystal, a polarization spectroscope, a linear polaroid, an electric control rotator module and an optical parametric oscillation crystal.
The laser pumping module 2 comprises a laser pumping source and a plane mirror; the laser pumping source comprises a quasi-continuous laser diode with the center wavelength of 808 nanometers and is used for carrying out end-face pumping on a laser gain medium; the included angle between the plane reflector and the plane where the three light paths are positioned is 45 degrees, and the plane reflector is used for guiding the pump light into the light paths; the upper end surface of the plane reflecting mirror is plated with a 1064nm full-transparent dielectric film, and the lower end surface is plated with a 808nm full-reflection and 1064nm full-transparent dielectric film layer;
the gain medium adopts Nd: YAG crystals for realizing the output of pulse laser with a first wavelength;
the imaging structure resonant cavity comprises a straight cavity type structure, an annular cavity type structure and an inner cavity type structure; the straight cavity structure is used for obtaining a first wavelength light beam with the wavelength of 1064 nm; the annular cavity structure is used for obtaining a second wavelength light beam with the wavelength of 532nm after passing through the frequency doubling crystal; the inner cavity structure is used for obtaining a third wavelength light beam with the wavelength of 1.57 mu m after optical parametric oscillation; the imaging structure resonant cavity adopts a unified gold-plated total reflection mirror 1 as an input mirror to realize total reflection effects on various wavelengths;
the Q-switching module comprises an acousto-optic modulator and a Cr-YAG crystal serving as a passive Q-switching crystal; the acousto-optic modulator is used for outputting high repetition frequency 532nm pulse laser; YAG crystal is used for realizing Q modulation of 1064nm oscillation light; the right end of the YAG crystal is plated with a dielectric film layer with the reflectivity of more than or equal to 80% for the wavelength of 1064nm to be used as an output mirror of a straight cavity structure;
the frequency doubling crystal adopts a KDP crystal to realize nonlinear transformation of the first wavelength and pulse laser output of the second wavelength;
the polarizing spectroscope comprises a first polarizing spectroscope, a second polarizing spectroscope, a third polarizing spectroscope and a fourth polarizing spectroscope, wherein the lower end surface of the first polarizing spectroscope is plated with a light total reflection film which polarizes 1064nm along the y-axis direction, the upper end surface of the first polarizing spectroscope is plated with a light total transmission film which transmits 532 nm; the lower end surface of the second polarization spectroscope is plated with a full-transmission film for 1064nm polarized light along the x-axis direction, and the upper side is plated with a full-transmission film layer for 532nm polarized light; the lower end surface of the third polarization spectroscope is plated with a full-transparent film for 1064nm light, the upper end surface of the third polarization spectroscope is plated with a full-reflective film for 1064nm light polarized along the y-axis direction, and a full-transparent film layer for 1064nm light polarized along the x-axis direction; a light total reflection film which polarizes 1064nm along the y-axis direction and a light total transmission film layer which transmits 1.57 mu m is plated above the fourth polarization spectroscope;
the linear polaroid is used for changing the fundamental frequency oscillation light into linear polarized light;
the electric control optical rotator module comprises a first electric control optical rotator and a second electric control optical rotator; the electric control optical rotator comprises an electro-optic crystal and a driving power supply, and the laser wavelength output by the driving power supply is selected by controlling the driving power supply;
the optical parametric oscillation crystal adopts a KTP crystal to realize nonlinear transformation of 1064nm fundamental frequency light and realize 1.57 mu m pulse laser output.
Referring to fig. 2, when the acousto-optic modulator 4 is turned off, the first electric control optical rotatory device D1 is turned off, the second electric control optical rotatory device D2 is turned off, pump light with the center wavelength of 808nm output by the laser pumping module 2 is incident on the left end face of the Nd: YAG crystal 3, oscillation light with the center wavelength of 1064nm obtained by stimulated radiation is changed into linear polarization light polarized along the x axis through the linear polarizer 5, after passing through the second polarizing spectroscope P2 and the third polarizing spectroscope P3 in succession, passive Q adjustment is carried out through the Cr: YAG crystal 6, the oscillation light with the wavelength of 1064nm plated on the rear end of the crystal is partially transmitted by a dielectric film layer with the reflectivity of more than or equal to 80%, the reflected oscillation light with the wavelength of 1064nm returns to reach the laser pumping module 2, after passing through a plane mirror with the full-transparent film of 1064nm plated on the lower end face in the module, the right end of the laser-plated full-reflection mirror 1 is totally reflected, one round trip in the laser cavity is completed, and the oscillation light outputs low-repetition frequency laser with the wavelength of 1064nm after multiple round trips in the imaging resonant cavity;
referring to fig. 3, when the electric control rotator D1 is turned off, pump light with a center wavelength of 808nm output from the laser pumping module 2 is incident on Nd: the left end face of the YAG crystal 3 is changed into high-repetition frequency oscillation light with the center wavelength of 1064nm through an acousto-optic modulator 4, the oscillation light is changed into linear polarization polarized along the x-axis through a linear polarizer 5, the linear polarization polarized along the x-axis is changed into linear polarization polarized along the y-axis after passing through a second polarization spectroscope P2 and a second electric control rotator D2, the linear polarization polarized along the x-axis is totally reflected to the lower end face of a first polarization spectroscope P1 after passing through a third polarization spectroscope P3, then is totally reflected by the first polarization spectroscope P1, is subjected to frequency multiplication through a KDP frequency doubling crystal 7, so as to obtain oscillation light with the wavelength of 532nm and fundamental frequency light with the wavelength of 1064nm, the two wavelengths are reflected by a gold-plated total reflection mirror 1 again through the KDP crystal 7, laser with the wavelength of 532nm is transmitted by the first polarization spectroscope P1 and then reaches the laser pumping module 2 along the original optical path after being totally reflected by the first polarization spectroscope P1, the laser with the wavelength of 1064nm is totally reflected by the plane mirror in the laser pumping module, the laser with the laser light with the full reflection of the full wavelength of 1064nm in the laser light back-reflection cavity, and the laser light with the full reflection light with the full wavelength of 532nm is repeatedly transmitted to the laser light with the full reflection wavelength of the laser light in the laser resonant cavity in the right resonant cavity after the resonant cavity is repeatedly transmitted for multiple times;
referring to fig. 4, when the acousto-optic modulator 4 is turned off, the second electrically controlled optical rotatory plate D2 is turned off, and the pump light with a center wavelength of 808nm output by the laser pump module 2 is incident on Nd: the left end face of the YAG crystal 3 is excited to radiate to obtain oscillation light with the center wavelength of 1064nm, the oscillation light is changed into linear polarization polarized along the x-axis through a linear polarizing plate 5, the linear polarization polarized along the x-axis is changed into linear polarization polarized along the y-axis after passing through a first electric control rotator D1, the linear polarization polarized along the x-axis is changed into linear polarization polarized along the y-axis after passing through a second polarizing spectroscope P2, the linear polarization is totally reflected to the upper end face of a fourth polarizing spectroscope P4, then the linear polarization is totally reflected by the fourth polarizing spectroscope P4, the oscillation light with the wavelength of 1.57 mu m and fundamental frequency light with the wavelength of 1064nm are obtained through a KTP optical parametric oscillation crystal 9, the light beams with the two wavelengths are reflected by a gold-plated total reflection mirror 1, the laser with the wavelength of 1.57 mu m is transmitted again through the KTP crystal 9, the laser with the wavelength of 1064nm is returned to the laser pumping module 2 along the original optical path after being totally reflected by the fourth polarizing spectroscope P4, the laser is incident to the right end of the full reflection mirror 1 after passing through the plane reflection mirror with the lower end face of the 1064nm full-transparent film in the module, and the oscillation light is repeatedly emitted into the laser cavity with the resonant wave of multiple laser light with the wavelength of 1 mu m, and the resonant wave is repeatedly low-back and low frequency.
In the embodiment of the invention, the pulse lasers with different wavelengths and different repetition frequencies can be realized, so that the laser military system can conveniently select different wavelengths for application according to different distances, different energies and different functions; and the structure is compact, the volume is small, and the cost is low.
Compared with the prior art, the invention has the advantages that:
1) The multi-wavelength solid laser can switch and output pulse lasers with various different wavelengths, can theoretically realize laser output with more wavelengths, and has wide application range;
2) The multi-wavelength solid laser can realize the selection of pulse repetition frequency by utilizing the acousto-optic Q-switching, the passive Q-switching and the polarization spectroscope, and has certain practical value;
3) The invention adopts the unified gold-plated total reflection mirror for the input mirror of the imaging resonant cavity, realizes the spontaneous collimation of the light paths of different wavelength outputs, avoids introducing other collimation elements, simplifies the structure of the laser, and ensures that the laser has compact structure and smaller volume.
The above embodiments are merely preferred embodiments of the present invention, the protection scope of the present invention is not limited thereto, and any simple changes or equivalent substitutions of technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention disclosed in the present invention belong to the protection scope of the present invention.

Claims (9)

1. A crystalline Q-switched solid state laser having 3 wavelength conversions, comprising:
a gold-plated total reflection mirror (1);
the pulse laser output module is arranged behind the gold-plated total reflection mirror (1) and is used for outputting pumping light;
a first wavelength laser output module, comprising:
a linear polarizer (5) arranged behind the pulse laser output module; the second polarization spectroscope (P2) is arranged behind the linear polaroid (5) and forms an included angle of-45 degrees with the yOz plane; the third polarization spectroscope (P3) is arranged behind the second polarization spectroscope (P2) and forms an included angle of +45 degrees with the yOz plane; a passive Q-switched crystal (6) arranged behind the third polarization spectroscope;
a second wavelength laser output module, comprising:
a second electrically controlled optical rotator (D2) arranged between the second polarization beam splitter (P2) and the third polarization beam splitter (P3);
an acousto-optic modulator (4) arranged between the linear polaroid (5) and the pulse laser output module;
the first polarization spectroscope (P1) is arranged above the third polarization spectroscope (P3), and the included angle between the first polarization spectroscope and the yOz plane is-45 degrees; a frequency doubling crystal (7) arranged in front of the first polarization beam splitter (P1);
an output mirror (8) disposed behind the first polarizing beamsplitter;
a third wavelength laser output module, comprising:
the first electric control rotator (D1) is arranged behind the linear polaroid (5); a fourth polarization spectroscope (P4) arranged below the second polarization spectroscope (P2) and having an included angle of +45 degrees with the yOz plane; an optical parametric oscillation crystal (9) arranged in front of the fourth polarization spectroscope;
when the acousto-optic modulator (4) is closed, the first electric control optical rotatory plate (D1) is closed, the second electric control optical rotatory plate (D2) is closed, the oscillation light output by the pulse laser output module is changed into linear polarization light polarized along the x-axis through the linear polaroid (5), the linear polarization light passes through the second polarization spectroscope (P2) and the third polarization spectroscope (P3) in succession, the passive Q modulation is carried out through the passive Q modulation crystal (6), the oscillation light is partially transmitted by a dielectric film layer plated at the rear end of the crystal, the reflected oscillation light returns to reach the pulse laser output module, the light is emitted to the right end of the gold-plated total reflection mirror (1) after passing through the pulse laser output module, one round trip in the laser resonant cavity is completed, and the oscillation light outputs low-repetition frequency pulse laser with the first wavelength after a plurality of round trips in the imaging resonant cavity;
when the first electric control rotator (D1) is closed, the oscillation light output by the pulse laser output module is changed into high-repetition frequency oscillation light through the acousto-optic modulator (4), the high-repetition frequency oscillation light is changed into linear polarized light polarized along the x-axis through the linear polarizer (5), the linear polarized light polarized along the x-axis is changed into linear polarized light polarized along the y-axis after passing through the second polarization spectroscope (P2) and the second electric control rotator (D2), the linear polarized light is totally reflected to the lower end face of the first polarization spectroscope (P1) after passing through the third polarization spectroscope (P3), then is totally reflected by the first polarization spectroscope (P1), the oscillation light with the second wavelength and the fundamental frequency light with the first wavelength are obtained through the frequency doubling crystal (7), the light with the second wavelength is reflected through the gold-plated total reflection mirror (1), the laser with the second wavelength is transmitted by the first polarization spectroscope (P1) and then is totally reflected by the output mirror along the first polarization spectroscope (P1), the laser with the first wavelength is totally reflected back to the laser cavity after passing through the frequency doubling crystal (7), the laser light is totally reflected back to the resonant cavity after passing through the laser light, and the laser light with the first wavelength is totally reflected back to the resonant cavity, the laser light is completely reflected by the resonant cavity, and the laser light is completely reflected in the resonant cavity, and the laser is repeatedly emitted to the laser light with the resonant cavity, and the laser light with the high wavelength is completely and the laser light with the resonant cavity;
when the acousto-optic modulator (4) is closed, the second electric control rotator (D2) is closed, the oscillation light with the first wavelength output by the pulse laser output module is changed into linear polarization polarized along the x-axis through the linear polarizer (5), the linear polarization polarized along the x-axis is changed into linear polarization polarized along the y-axis after passing through the first electric control rotator (D1), the linear polarization is totally reflected to the upper end face of the fourth polarization spectroscope (P4) after passing through the second polarization spectroscope (P2), then totally reflected by the fourth polarization spectroscope (P4), the oscillation light with the third wavelength and the fundamental frequency light with the first wavelength are obtained through the optical parametric oscillation crystal (9), the light with the two wavelengths is reflected through the gold-plating total reflection mirror (1), the laser with the third wavelength is transmitted and then output through the fourth polarization spectroscope (P4), the laser with the first wavelength reaches the original return cavity after being totally reflected by the fourth polarization spectroscope (P4), the oscillation light with the second wavelength reaches the pulse laser output cavity after reaching the full reflection mirror (1), the laser with the second wavelength is repeatedly reflected back to the resonant cavity, and the laser with the first wavelength is repeatedly reflected in the laser cavity, and the laser light with the second resonant cavity is repeatedly emitted in the laser with the second wavelength, and the laser light with the second wavelength is repeatedly the laser with the second wavelength.
2. A crystalline Q-switched solid state laser with 3 wavelength conversions according to claim 1, wherein the pulsed laser output module comprises: the laser pumping module (2) is arranged behind the gold-plated total reflection mirror (1);
and the gain medium (3) is arranged behind the laser pumping module (2).
3. A crystalline Q-switched solid state laser with 3 wavelength conversions according to claim 2, wherein the gain medium is Nd: YAG crystals.
4. A crystalline Q-switched solid state laser with 3 wavelength conversions according to claim 2, characterized in that the laser pumping module (2) comprises: the laser pumping source is a quasi-continuous laser diode with the center wavelength of 808 nanometers and is used for carrying out end-face pumping on the laser gain medium;
and the plane reflecting mirror forms an included angle of +45 degrees with the xOz plane where the three light paths are positioned, and is used for guiding the pumping light into the light paths.
5. The crystal Q-switched solid laser with 3 wavelength conversion according to claim 1, wherein the upper end surface of the gold-plated total reflection mirror (1) is plated with a dielectric film with total reflection to the pumping wavelength and a dielectric film with total transmission to the first wavelength.
6. The crystal Q-switched solid laser with 3 wavelength conversions according to claim 1, wherein the frequency doubling crystal (7) is one of potassium dihydrogen phosphate, lithium niobate, beta-phase barium metaborate, potassium titanyl phosphate, polarized lithium niobate crystal.
7. A crystal Q-switched solid-state laser with 3 wavelength conversions according to claim 1, characterized in that the optical parametric oscillation crystal (9) is a KTP crystal.
8. A crystalline Q-switched solid state laser with 3 wavelength conversions according to claim 1, characterized in that the passive Q-switched crystal (6) is a cr3+: YAG crystal.
9. A crystalline Q-switched solid state laser with 3 wavelength conversions according to claim 1, wherein the first electrically controlled optical rotator comprises: an electro-optic crystal; a driving power supply; the laser wavelength output by the first electric control rotator is selected by controlling the driving power supply.
CN202310278602.2A 2023-03-21 2023-03-21 Crystal Q-switched solid laser with 3 kinds of wavelength conversion Pending CN116316028A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310278602.2A CN116316028A (en) 2023-03-21 2023-03-21 Crystal Q-switched solid laser with 3 kinds of wavelength conversion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310278602.2A CN116316028A (en) 2023-03-21 2023-03-21 Crystal Q-switched solid laser with 3 kinds of wavelength conversion

Publications (1)

Publication Number Publication Date
CN116316028A true CN116316028A (en) 2023-06-23

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Family Applications (1)

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Country Status (1)

Country Link
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