CN110086076B - Wide-spectrum optical parametric oscillator - Google Patents
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- CN110086076B CN110086076B CN201910386032.2A CN201910386032A CN110086076B CN 110086076 B CN110086076 B CN 110086076B CN 201910386032 A CN201910386032 A CN 201910386032A CN 110086076 B CN110086076 B CN 110086076B
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- 229910003327 LiNbO3 Inorganic materials 0.000 claims abstract description 38
- 230000000694 effects Effects 0.000 claims abstract description 14
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- 238000005086 pumping Methods 0.000 claims abstract description 11
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 27
- 239000000395 magnesium oxide Substances 0.000 description 27
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 27
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- 229910013641 LiNbO 3 Inorganic materials 0.000 description 2
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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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
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
- H01S3/0816—Configuration of resonator having 4 reflectors, e.g. Z-shaped resonators
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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
- H01S3/106—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
- H01S3/1083—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 using parametric generation
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F1/392—Parametric amplification
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Abstract
The invention discloses a wide-spectrum optical parametric oscillator, which comprises a pumping source, MgO LiNbO3Crystal, pump light recovery box, Stokes light recovery box, and MgO LiNbO3A mirror around the crystal; the N-1 level Stokes light output from the resonant cavity is incident on the fifth reflector, the transmitted N-1 level Stokes light is changed into first N-1 level Stokes light, the reflected N-1 level Stokes light is changed into second N-1 level Stokes light, and the second N-1 level Stokes light is reflected by the sixth reflector and the seventh reflector to form a first optical pathθ 2Angle incidence MgO LiNbO3The crystal generates N-level Stokes light and N-level terahertz waves through an optical parametric effect; thus, N beams of Stokes light are generated simultaneously, wherein N is an integer and is more than 1; the wavelength of the N-level Stokes light is larger than that of the (N-1) -level Stokes light, and one beam of pump light generates wide-spectrum Stokes light; by varying the angleθ 1Angle of harmonyθ 2And wide tuning Stokes light of each stage can be obtained. The tuning mode is simple and the operation is flexible.
Description
Technical Field
The invention belongs to the technical field of terahertz wave application, and particularly relates to a wide-spectrum optical parametric oscillator.
Background
Terahertz waves (THz for short) mean that the frequency is 0.1-10THz (1THz is 10)12THz), the band of which lies between the millimeter wave and the infrared in the electromagnetic spectrum, is the transition region from photonics and electronics, macroscopic theory to microscopic theory. The terahertz wave is located at a special position, so that the terahertz wave has great scientific research value and wide application prospect in the basic research fields of physics, chemistry, astronomy, molecular spectrum, life science, medical science and the like, and the application research fields of medical imaging, environmental monitoring, material detection, food detection, radio astronomy, mobile communication, satellite communication, military radar and the like. Terahertz waves are mainly applied in the following fields:
(1) field of imaging
The transient electromagnetic field generated by the terahertz electromagnetic pulse can be directly measured by utilizing the terahertz time-domain spectroscopy technology, and the dielectric constant of a sample can be directly measured.
(2) The field of biochemistry
Because the rotation absorption spectrum of a plurality of biomacromolecules is in the terahertz frequency band, the molecular motion condition information in the reaction can be obtained by utilizing the research on the terahertz absorption spectrum of biochemical reaction. Provides a powerful means for further researching the biochemical reaction.
(3) Field of astronomy
In the universe, a large number of substances emit terahertz electromagnetic waves. Carbon (C), water (H)2O), carbon monoxide (CO), nitrogen (N)2) Oxygen (O)2) And a large number of molecules can be detected in the terahertz frequency band.
(4) Field of communications
Terahertz waves are good broadband information carriers and can carry audio or video signals for transmission. The terahertz wave is used for communication, and the wireless transmission speed of 10GB/s can be obtained, which is hundreds to thousands of times faster than the current ultra-wideband technology.
(5) The field of homeland security
In the field of homeland security, due to the non-ionization property and strong penetrability of the terahertz waves, the terahertz waves can provide long-distance and large-range early warning for hidden dangerous goods such as explosives, contraband, weapons, drugs and the like in airports, stations and the like.
The lack of terahertz sources capable of generating high-power, high-quality and high-efficiency terahertz waves and operating at room temperature with low cost is a major problem at present. At present, the terahertz wave generation method mainly comprises an electronics method and a photonics method. The electronic method is a process that the wavelength of electromagnetic radiation is generally extended from millimeter waves to a terahertz waveband, namely, the process is equivalent to a frequency increasing process, but when the frequency is greater than 1THz, the process is hindered greatly, so that the efficiency is low, and meanwhile, a terahertz wave radiation source generated by the electronic method is large in size, so that the application of the terahertz wave radiation source in many fields is limited. The main direction of the photonics method is to convert visible light or infrared light to a terahertz wave band. The method has the advantages that the generated terahertz radiation source has high coherence and directivity, but the power of the wide-spectrum near-infrared light used for generating the wide-tuning terahertz waves at present is low.
Disclosure of Invention
The invention aims to provide a broad-spectrum optical parametric oscillator, which is used for solving the problems of low power, low efficiency and the like of the existing terahertz wave.
The object of the invention is achieved in the following way:
a wide-spectrum optical parametric oscillator comprises a pumping source, MgO LiNbO3Crystal, pump light recovery box, Stokes light recovery box, and MgO LiNbO3A mirror around the crystal;
the pumping light emitted from the pumping source is reflected by the first reflector and the second reflector and then is in theta1Angle incidence MgO LiNbO3The crystal generates first-level Stokes light and first-level terahertz waves through an optical parameter effect, and the first-level Stokes light is oscillated and amplified in a resonant cavity formed by a third reflector and a fourth reflector and is partially output from the resonant cavity; from MgO LiNbO3The pump light emitted by the crystal is recovered by a pump light recovery box;
output from the resonatorThe first-stage Stokes light is incident to the fifth reflecting mirror, the transmitted first-stage Stokes light becomes first-stage Stokes light, and the reflected first-stage Stokes light becomes second-stage Stokes light; the second-stage Stokes light is reflected by the sixth reflector and the seventh reflector and then takes theta2Angle incidence MgO LiNbO3The crystal generates secondary Stokes light and secondary terahertz wave through optical parameter effect; the second-order Stokes light is oscillated and amplified in a resonant cavity formed by a third reflector and a fourth reflector and is partially output from the resonant cavity;
the second-level Stokes light output from the resonant cavity is incident to the fifth reflector, the transmitted second-level Stokes light is changed into first-level second-level Stokes light, the reflected second-level Stokes light is changed into second-level Stokes light, and the second-level Stokes light is reflected by the sixth reflector and the seventh reflector and then forms a theta2Angle incidence MgO LiNbO3The crystal generates three-level Stokes light and three-level terahertz wave through optical parameter effect; the three-level Stokes light is oscillated and amplified in a resonant cavity formed by a third reflector and a fourth reflector and is partially output from the resonant cavity;
the third-level Stokes light output from the resonant cavity is incident to the fifth reflector, the transmitted third-level Stokes light is changed into first-level Stokes light, the reflected third-level Stokes light is changed into second-level Stokes light, and the second-level Stokes light is reflected by the sixth reflector and the seventh reflector and then forms a theta angle2Angle incidence MgO LiNbO3The crystal generates a fourth-order Stokes light and a fourth-order terahertz wave through an optical parametric effect; the four-level Stokes light is oscillated and amplified in a resonant cavity formed by a third reflector and a fourth reflector and is partially output from the resonant cavity;
……
the N-1 level Stokes light output from the resonant cavity is incident on the fifth reflector, the transmitted N-1 level Stokes light is changed into first N-1 level Stokes light, the reflected N-1 level Stokes light is changed into second N-1 level Stokes light, and the second N-1 level Stokes light is reflected by the sixth reflector and the seventh reflector and then is reflected by theta2Angle incidence MgO LiNbO3The crystal generates N-level Stokes light and N-level terahertz waves through an optical parametric effect; thus, N beams of Stokes light are generated simultaneously, wherein N is an integer and is more than 1; the wavelength of the N-level Stokes light is greater than that of the (N-1) -level Stokes light, and one pump light beamGenerating a broad spectrum Stokes light;
the plane of beam propagation is a plane determined by an X axis and a Y axis, a Z axis is vertical to the plane of beam propagation, the propagation direction of pump light emitted from a pump source is the positive direction of the X axis, and the propagation direction of second-stage Stokes light is the negative direction of the Y axis;
θ1is the angle theta between the pump light reflected by the second reflector and the negative direction of the X axis2Is reflected by a seventh reflector and then enters MgO LiNbO3The Stokes light of the crystal forms an angle with the negative direction of the X axis.
The pumping source adopts a pulse laser, the wavelength is 1064nm, the repetition frequency is 10Hz, the single-pulse energy is 100mJ, the beam diameter is 5mm, and the polarization direction is the Z axis.
The first reflector, the second reflector, the third reflector, the fourth reflector, the fifth reflector, the sixth reflector and the seventh reflector are plane mirrors, and the angles of the plane mirrors are adjustable.
The first reflector and the second reflector are used for totally reflecting pump light with the wavelength of 1064nm, the third reflector, the sixth reflector and the seventh reflector are used for totally reflecting Stokes light of all levels with the wavelength range of 1064-plus 2000nm, the fourth reflector is used for totally reflecting Stokes light of all levels with the wavelength range of 1064-plus 2000nm, the included angle between the fifth reflector and the propagation direction of N-1 level Stokes light is 45 degrees, and the fifth reflector is used for 50% reflection and 50% transmission of Stokes light of all levels with the wavelength range of 1064-plus 2000 nm.
The MgO is LiNbO3The crystal is a cuboid and is rectangular in an X-Y plane; the MgO doping concentration is 5 mol%, and the optical axis of the crystal is along the Z axis.
The MgO is LiNbO3The size of the crystal X × Y × Z was 40mm × 30mm × 8 mm.
The first-order Stokes light, the second-order Stokes light and the … … N-order Stokes light are propagated in a collinear way in a resonant cavity formed by the third reflector and the fourth reflector.
The MgO is LiNbO3The first-level terahertz wave, the second-level terahertz wave and the … … N-level terahertz wave generated in the crystal are not output.
From MgO LiNbO3Second-stage Stokes light emitted by crystalThe second level Stokes light, … … the second N-1 level Stokes light is recycled by the Stokes light recycling box.
Compared with the prior art, the wide-spectrum optical parametric oscillator has the following advantages that:
(1) by varying the angle theta1And angle theta2And wide tuning Stokes light of each stage can be obtained. The tuning mode is simple and the operation is flexible.
(2) The (N-1) th level Stokes light can generate the Nth level Stokes light, and all levels of Stokes light can be recycled.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a schematic diagram of phase matching of pump light, Stokes light and terahertz wave in a crystal of LiNbO 3. In the figure, kp, ks1 and kT1 are wave vectors of pump light, first-order Stokes light and first-order terahertz wave, respectively, and ksN, ks (N +1) and kT (N +1) are wave vectors of nth-order Stokes light, (N +1) th-order Stokes light and (N +1) th-order terahertz wave, respectively. The angle θ 1 is an angle between the pump light wave vector kp and the first-order Stokes light wave vector ks1, and the angle θ 2 is an angle between the nth-order Stokes light wave vector ksN and the (N +1) th-order Stokes light wave vector ks (N + 1).
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-2, a broad-spectrum optical parametric oscillator includes a pump source 1, a MgO LiNbO3 crystal 5, a pump light recovery box 9, a Stokes light recovery box 16, and a mirror disposed around the MgO LiNbO3 crystal 5;
LiNbO3 crystal 5, generating first-level Stokes light 6S1 and first-level terahertz wave by optical parametric effect, oscillating and amplifying the first-level Stokes light 6S1 in a resonant cavity formed by a third reflector 7 and a fourth reflector 8, and partially outputting the first-level Stokes light from the resonant cavity; the pumping light 2 emitted from the crystal 5 of the MgO LiNbO3 is recovered by a pumping light recovery box 9;
the first-stage Stokes light 6S1 output from the resonant cavity is incident on the fifth reflector 13, the transmitted first-stage Stokes light 6S1 becomes first-stage Stokes light 6S11, and the reflected first-stage Stokes light 6S1 becomes second-stage Stokes light 6S 12; the second-stage Stokes light 6S12 is reflected by the sixth reflector 14 and the seventh reflector 15 and then enters MgO (magnesium oxide) LiNbO3 crystal 5 at an angle of theta 2, and the second-stage Stokes light 6S2 and the second-stage terahertz wave are generated by an optical parametric effect; the second-order Stokes light 6S2 is oscillated and amplified in the resonant cavity formed by the third mirror 7 and the fourth mirror 8 and is partially output from the resonant cavity;
the second-level Stokes light 6S2 output from the resonant cavity is incident to the fifth reflector 13, the transmitted second-level Stokes light 6S2 is changed into first second-level Stokes light 6S21, the reflected second-level Stokes light 6S2 is changed into second-level Stokes light 6S22, the second-level Stokes light 6S22 is reflected by the sixth reflector 14 and the seventh reflector 15 and then is incident to MgO at an angle theta 2, namely LiNbO3 crystal 5, and the third-level Stokes light 6S3 and the third-level terahertz wave are generated through an optical parametric effect; the three-level Stokes light 6S3 is oscillated and amplified in the resonant cavity formed by the third mirror 7 and the fourth mirror 8 and is partially output from the resonant cavity;
the third-level Stokes light 6S3 output from the resonant cavity is incident to the fifth reflector 13, the transmitted third-level Stokes light 6S3 is changed into first third-level Stokes light 6S31, the reflected third-level Stokes light 6S3 is changed into second third-level Stokes light 6S32, the second third-level Stokes light 6S32 is reflected by the sixth reflector 14 and the seventh reflector 15 and then is incident to MgO at an angle theta 2, namely LiNbO3 crystal 5, and fourth-level Stokes light 6S4 and fourth-level terahertz waves are generated through an optical parametric effect; the four-level Stokes light 6S4 is oscillated and amplified in the resonator composed of the third mirror 7 and the fourth mirror 8 and is partially output from the resonator;
……
the N-1 level Stokes light 6S (N-1) output from the resonant cavity is incident on the fifth reflector 13, the transmitted N-1 level Stokes light 6S (N-1) is changed into first N-1 level Stokes light 6S (N-1)1, the reflected N-1 level Stokes light 6S (N-1) is changed into second N-1 level Stokes light 6S (N-1)2, the second N-1 level Stokes light 6S (N-1)2 is reflected by the sixth reflector 14 and the seventh reflector 15 and then is incident on MgO at an angle of theta 2, the LiNbO3 crystal 5 is incident on the MgO, and the N level Stokes light 6SN and the N level terahertz waves are generated through an optical parametric effect; thus, N beams of Stokes light are generated simultaneously, wherein N is an integer and is more than 1; the wavelength of the N-level Stokes light is larger than that of the (N-1) -level Stokes light, and one beam of pump light 2 generates wide-spectrum Stokes light;
the plane of beam propagation is a plane determined by an X axis and a Y axis, a Z axis is vertical to the plane of beam propagation, the propagation direction of pump light 2 emitted from a pump source 1 is the positive direction of the X axis, and the propagation direction of second-stage Stokes light 6S12 is the negative direction of the Y axis;
The pumping source 1 adopts a pulse laser, the wavelength is 1064nm, the repetition frequency is 10Hz, the single-pulse energy is 100mJ, the beam diameter is 5mm, and the polarization direction is the Z axis.
The first reflector 3, the second reflector 4, the third reflector 7, the fourth reflector 8, the fifth reflector 13, the sixth reflector 14 and the seventh reflector 15 are plane mirrors, and the angles of the plane mirrors are adjustable.
The first reflector 3 and the second reflector 4 totally reflect the pump light 2 with the wavelength of 1064nm, the third reflector 7, the sixth reflector 14 and the seventh reflector 15 totally reflect the Stokes light of each level with the wavelength range of 1064-plus 2000nm, the fourth reflector 8 totally reflects the Stokes light of each level with the wavelength range of 1064-plus 2000nm with the light transmittance of 60%, the included angle between the fifth reflector 13 and the propagation direction of the N-1 level Stokes light 6S (N-1) is 45%, and the fifth reflector 13 reflects the Stokes light of each level with the wavelength range of 1064-plus 2000nm by 50% and transmits by 50%.
Size X Y Z of LiNbO3 crystal 5 is 40mm X30 mm X8 mm.
In this embodiment, the primary Stokes light 6S1, the secondary Stokes light 6S2, and the … … N-stage Stokes light 6SN travel collinearly in the cavity formed by the third mirror 7 and the fourth mirror 8.
In this embodiment, as shown in fig. 2, the angle θ 1 is an included angle between the pump light 2 and the first-stage Stokes light 6S1, and the angle θ 2 is an included angle between the second-stage Stokes light 6S12 reflected by the seventh reflecting mirror 15 and the first-stage Stokes light 6S 1. Changing the angle θ 1 can change the wavelength of the Stokes light of each stage, and changing the angle θ 2 can change the wavelength of the Stokes light of each stage except the first Stokes light 6S 1.
According to the law of conservation of energy omegaP＝ωS+ωTAnd phase matching relation
The wavelength of Stokes light of each level and the frequency of terahertz waves of each level can be calculated. Wherein, ω P, ω S and ω T are the angular frequency of the pump light, the angular frequency of the Stokes light and the angular frequency of the terahertz wave respectively, θ is the included angle between the pump light and the Stokes light, kP, kS and kT are the wave vectors of the pump light, the Stokes light and the terahertz wave in the crystal respectively,
ni is the refractive index of the pump light, the Stokes light and the terahertz wave in the crystal respectively, and c is the light speed in vacuum.
When N is 4, the angle θ 1 is 1 ° and the angle θ 2 is 1.1 °, calculated as: the wavelength of the first-level Stokes light 6S1 is 1072.7nm, the wavelength of the second-level Stokes light 6S2 is 1082.2nm, the wavelength of the third-level Stokes light 6S3 is 1091.8nm, and the wavelength of the fourth-level Stokes light 6S4 is 1101.5 nm.
MgO, namely the first-level terahertz wave and the second-level terahertz wave … … N-level terahertz wave generated in the LiNbO3 crystal 5 are not output.
The second-stage Stokes light 6S12, the second-stage Stokes light 6S22 … …, the second N-1-stage Stokes light 6S (N-1)2 emitted from the crystal 5 of LiNbO3 as MgO are recovered by the Stokes light recovery box 16.
The terahertz wave is not output in the invention, and only used for generating near infrared light with a wide spectrum.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (9)
1. A broad spectrum optical parametric oscillator, characterized by: comprises a pump source (1), and LiNbO as MgO3A crystal (5), a pump light recovery box (9), a Stokes light recovery box (16), and a crystal arranged at MgO: LiNbO3A mirror around the crystal (5);
the pumping light (2) emitted from the pumping source (1) is reflected by a first reflector (3) and a second reflector (4) and then forms theta1Angle incidence MgO LiNbO3The crystal (5) generates first-level Stokes light (6S1) and first-level terahertz waves through an optical parametric effect, and the first-level Stokes light (6S1) is oscillated and amplified in a resonant cavity formed by a third reflector (7) and a fourth reflector (8) and is partially output from the resonant cavity; from MgO LiNbO3The pump light (2) emitted by the crystal (5) is recycled by a pump light recycling box (9);
the first-stage Stokes light (6S1) output from the resonant cavity enters the fifth reflecting mirror (13), the transmitted first-stage Stokes light (6S1) becomes first-stage Stokes light (6S11), and the reflected first-stage Stokes light (6S1) becomes second-stage Stokes light (6S 12); the second stage Stokes light (6S12) is reflected by a sixth mirror (14) and a seventh mirror (15) and then is in theta2Angle incidence MgO LiNbO3The crystal (5) generates secondary Stokes light (6S2) and secondary terahertz waves through an optical parametric effect; the second-order Stokes light (6S2) is oscillated and amplified in a resonant cavity formed by a third reflector (7) and a fourth reflector (8) and is partially output from the resonant cavity;
by the way of analogy, the method can be used,
the N-1 level Stokes light (6S (N-1)) output from the resonant cavity enters a fifth reflector (13), the transmitted N-1 level Stokes light (6S (N-1)) is changed into first N-1 level Stokes light (6S (N-1)1), the reflected N-1 level Stokes light (6S (N-1)) is changed into second N-1 level Stokes light (6S (N-1)2), and the second N-1 level Stokes light (6S (N-1)2) is reflected by a sixth reflector (14) and a seventh reflector (15) and then is reflected by theta2Angle incidence MgO LiNbO3The crystal (5) generates N-level Stokes light (6SN) and N-level terahertz waves through an optical parametric effect; thus, N beams of Stokes light are generated simultaneously, wherein N is an integer and is more than 1; the wavelength of the N-level Stokes light is larger than that of the (N-1) -level Stokes light, and one beam of pumping light (2) generates the wide-spectrum Stokes light；
The plane of beam propagation is a plane determined by an X axis and a Y axis, a Z axis is vertical to the plane of beam propagation, the propagation direction of pump light (2) emitted from a pump source (1) is the positive direction of the X axis, and the propagation direction of second-stage Stokes light (6S12) is the negative direction of the Y axis;
θ1is the included angle theta between the pump light (2) reflected by the second reflector (4) and the negative direction of the X axis2Is reflected by a seventh reflector (15) and then is incident on MgO LiNbO3The Stokes light of the crystal (5) forms an included angle with the negative direction of the X axis.
2. The broad spectrum optical parametric oscillator of claim 1, wherein: the pump source (1) adopts a pulse laser, the wavelength is 1064nm, the repetition frequency is 10Hz, the single-pulse energy is 100mJ, the beam diameter is 5mm, and the polarization direction is the Z axis.
3. The broad spectrum optical parametric oscillator of claim 1, wherein: the first reflector (3), the second reflector (4), the third reflector (7), the fourth reflector (8), the fifth reflector (13), the sixth reflector (14) and the seventh reflector (15) are plane mirrors, and the angles of the plane mirrors are adjustable.
4. The broad spectrum optical parametric oscillator of claim 3, wherein: the first reflector (3) and the second reflector (4) are used for totally reflecting pump light (2) with the wavelength of 1064nm, the third reflector (7), the sixth reflector (14) and the seventh reflector (15) are used for totally reflecting Stokes light of all levels with the wavelength range of 1064-plus 2000nm, the fourth reflector (8) is used for totally reflecting Stokes light of all levels with the wavelength range of 1064-plus 2000nm, the included angle between the fifth reflector (13) and the propagation direction of N-1 level Stokes light (6S (N-1)) is 45 degrees, and the fifth reflector (13) is used for 50% reflection and 50% transmission of Stokes light of all levels with the wavelength range of 1064-plus 2000 nm.
5. The broad spectrum optical parametric oscillator of claim 1, wherein: the MgO is LiNbO3The crystal (5) is a cuboid which is rectangular in an X-Y plane(ii) a The MgO doping concentration is 5 mol%, and the optical axis of the crystal is along the Z axis.
6. The broad spectrum optical parametric oscillator of claim 5, wherein: the MgO is LiNbO3The size X × Y × Z of crystal (5) was 40mm × 30mm × 8 mm.
7. The broad spectrum optical parametric oscillator of claim 1, wherein: the primary Stokes light (6S1), the secondary Stokes light (6S2) … … N-stage Stokes light (6SN) collinearly propagate in a resonant cavity formed by the third reflector (7) and the fourth reflector (8).
8. The broad spectrum optical parametric oscillator of claim 1, wherein: the MgO is LiNbO3And the first-level terahertz wave and the second-level terahertz wave … … N-level terahertz wave generated in the crystal (5) are not output.
9. The broad spectrum optical parametric oscillator of claim 1, wherein: from MgO LiNbO3The second level Stokes light (6S12) emitted by the crystal (5), the second level Stokes light (6S22) … … and the second N-1 level Stokes light (6S (N-1)2) are recovered by a Stokes light recovery box (16).
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| WO2007085859A1 (en) * | 2006-01-26 | 2007-08-02 | The University Court Of The University Of St. Andrews | Parametric generation using intersecting cavities |
| JP4958349B2 (en) * | 2001-09-26 | 2012-06-20 | 独立行政法人理化学研究所 | Ring resonator and its fast tuning method |
| CN104158077A (en) * | 2014-07-31 | 2014-11-19 | 天津大学 | Rapid tuning terahertz parametric oscillation radiation source device and method based on rowland circle |
| CN109167236A (en) * | 2018-10-11 | 2019-01-08 | 华北水利水电大学 | A kind of three-dimensional terahertz-wave parametric oscillator |
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| JP4958349B2 (en) * | 2001-09-26 | 2012-06-20 | 独立行政法人理化学研究所 | Ring resonator and its fast tuning method |
| WO2007085859A1 (en) * | 2006-01-26 | 2007-08-02 | The University Court Of The University Of St. Andrews | Parametric generation using intersecting cavities |
| CN104158077A (en) * | 2014-07-31 | 2014-11-19 | 天津大学 | Rapid tuning terahertz parametric oscillation radiation source device and method based on rowland circle |
| CN109167236A (en) * | 2018-10-11 | 2019-01-08 | 华北水利水电大学 | A kind of three-dimensional terahertz-wave parametric oscillator |
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