CN111129931A - 10-12 mu m waveband long-wave infrared optical parametric oscillator for seed light injection - Google Patents
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Abstract
A long-wave infrared optical parametric oscillator with a wave band of 10-12 mu m injected by seed light belongs to the field of optics and solves the problems of high light-emitting threshold and low light-light conversion efficiency of the existing long-wave infrared optical parametric oscillator. The device comprises a 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by seed light, an optical parametric oscillator and a control unit, wherein the long-wave infrared optical parametric oscillator is a beam of continuous seed light and a beam of pulse pumping light which are simultaneously injected into the optical parametric oscillator, and the continuous seed light and the pulse pumping light generate signal light and idler frequency light through the optical parametric oscillator; the wavelength of the continuous seed light is the same as that of the signal light or the idler frequency light. The invention relates to a 10-12 mu m waveband long-wave infrared optical parametric oscillator for seed light injection.
Description
Technical Field
The invention belongs to the field of optics.
Background
The long-wave infrared laser with the wavelength of 10-12 microns is positioned in an atmospheric transparent window and is positioned in an intrinsic absorption spectrum band of substances such as harmful chemical agents, toxic gases, industrial emissions and the like, so that the long-wave infrared laser is widely applied to detection of atmospheric pollutants. Meanwhile, the emission spectrum of the tail flame of the military engine is positioned in the waveband, so that the laser in the waveband has application value in the field of photoelectric countermeasure.
The main technical approaches to obtain 10 μm lasers are Difference Frequency (DF), Optical Parametric Generation (OPG), Optical Parametric Oscillation (OPO) and Optical Parametric Amplifier (OPA). DF requires two pulsed pump sources, OPG requires pulsed pumping on the picosecond and femtosecond scale, in contrast to OPO, which requires only one nanosecond pulsed pump source and has the ability to produce high average power, high pulse energy infrared lasers.
The 10-12 μm OPO comprises a pumping source, a nonlinear crystal and a resonant cavity, wherein the requirements for the nonlinear crystal are wide optical transmittance, large effective nonlinear optical coefficient, large damage threshold and large size. At present, there are no nonlinear crystals that fully satisfy the above requirements, only partially satisfy the requirements: AgGaSe2、GaSe、OP-GaAs、BaGa4Se7CdSe, etc. OP-GaAs and GaSe have large effective nonlinear optical coefficients, but the OP-GaAs growth process is not mature, and GaSe has poor mechanical properties, so that the OP-GaAs and GaSe are difficult to machine into a designed phase matching angle. AgGaSe2、BaGa4Se7The effective nonlinear optical coefficient of CdSe is small, and AgGaSe2Low damage threshold, difficult to generate high power laser output, BaGa4Se7The current growth process is not mature, and the current growth process of CdSe is mature, so that large-size crystals can be obtained. CdSe is the best nonlinear crystal selected at present, but the smaller effective nonlinear optical coefficient of CdSe enables the light-emitting threshold of OPO to be high and the light-light conversion efficiency to be low, so that the output of high-power long-wave infrared laser is difficult to realize.
In a conventional optical parametric oscillator (as shown in fig. 1), a pulse pump light passes through the optical parametric oscillator to generate a signal light (short wave) and an idler light (long wave), the wavelength of the idler light is specified to be greater than that of the signal light, and the idler light is laser light to be obtained, that is, output light. Because signal light and idler light in the traditional optical parametric oscillator are established from noise, the light-emitting threshold is higher, and the light-light conversion efficiency is lower.
Disclosure of Invention
The invention aims to solve the problems of high light-emitting threshold and low light-light conversion efficiency of the conventional long-wave infrared optical parametric oscillator, and provides a 10-12 mu m waveband long-wave infrared optical parametric oscillator for seed light injection.
The device comprises a 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by seed light, an optical parametric oscillator and a control circuit, wherein the long-wave infrared optical parametric oscillator is a beam of continuous seed light and a beam of pulse pumping light which are simultaneously injected into the optical parametric oscillator, and the continuous seed light and the pulse pumping light generate signal light and idler frequency light through the optical parametric oscillator; the wavelength of the continuous seed light is the same as that of the signal light or the idler frequency light.
The invention has the advantages that: the invention provides a long-wavelength infrared optical parametric oscillator for seed light (continuous light) injection. Compared with the traditional long-wave infrared optical parametric oscillator, the wavelength of the seed light is the same as that of the signal light or the idle frequency light. Because the seed light is injected, the signal light and the idler frequency light (output light) are established on the basis of the photon density of the seed light, the light-emitting threshold is reduced, and the light-light conversion efficiency is improved.
The optical parametric oscillator has three oscillation modes of signal light (short wave) single resonance, idler frequency light (long wave) single resonance and double resonance, and the injected seed light can be short wave or long wave, so that the seed light (continuous light) with six conditions is injected into the optical parametric oscillator.
Experiments show that the wavelength of continuous seed light is the same as that of signal light, namely, compared with the traditional shortwave single-resonance optical parametric oscillator, the shortwave seed light is injected into the signal light single-resonance optical parametric oscillator, and the light emitting threshold value is from 0.58J/cm2The reduction is 0.5J/cm2The light-to-light conversion efficiency is increased from 3.62% to 4.69%; the wavelength of the continuous seed light is the same as that of the signal light, namely, compared with the traditional long-wave single-resonance optical parametric oscillator, the short-wave seed light is injected into the idle-frequency light single-resonance optical parametric oscillator (long-wave single-resonance optical parametric oscillator), the light-emitting threshold is higherThe value is from 0.76J/cm2The reduction is 0.58J/cm2The light-to-light conversion efficiency increased from 1.48% to 3.42%. Namely, the light emitting threshold can be effectively reduced and the light-light conversion efficiency can be improved through the seed light injection.
Drawings
FIG. 1 is a schematic flow diagram of a conventional optical parametric oscillator;
FIG. 2 is a flow diagram of an optical parametric oscillator for sub-optical injection in accordance with an embodiment;
FIG. 3 is a schematic structural diagram of a single-resonant optical parametric oscillator for signal light injected by seed light when the wavelength of the second continuous seed light is the same as that of the signal light according to the second embodiment;
FIG. 4 is a schematic structural diagram of a single-resonant optical parametric oscillator for signal light injected by seed light when the wavelength of continuous seed light is the same as that of idler light according to the second embodiment;
fig. 5 is a schematic structural diagram of an idler-frequency single-resonance optical parametric oscillator injected with seed light when the wavelength of five continuous seed light is the same as that of the signal light according to the fifth embodiment;
FIG. 6 is a schematic structural diagram of an idler single-resonator optical parametric oscillator injected with seed light when the wavelength of five continuous seed light is the same as that of the idler light according to the fifth embodiment;
fig. 7 is a schematic structural diagram of a dual-resonant optical parametric oscillator for eight-photon injection according to an embodiment.
Detailed Description
The first embodiment is as follows: referring to fig. 2, the 10 μm to 12 μm waveband long-wave infrared optical parametric oscillator for injecting seed light in the present embodiment is a beam of continuous seed light and a beam of pulsed pump light which are injected into the optical parametric oscillator at the same time, and the continuous seed light and the pulsed pump light generate signal light and idler frequency light through the optical parametric oscillator; the wavelength of the continuous seed light is the same as that of the signal light or the idler frequency light.
The beneficial effects of the embodiment are as follows:
the present embodiments provide a long wavelength infrared optical parametric oscillator for seed light (continuous light) injection. Compared with the traditional long-wave infrared optical parametric oscillator, the wavelength of the seed light is the same as that of the signal light or the idle frequency light. Because the seed light is injected, the signal light and the idler frequency light (output light) are established on the basis of the photon density of the seed light, the light-emitting threshold is reduced, and the light-light conversion efficiency is improved.
The optical parametric oscillator has three oscillation modes of signal light (short wave) single resonance, idler frequency light (long wave) single resonance and double resonance, and the injected seed light can be short wave or long wave, so that the seed light (continuous light) with six conditions is injected into the optical parametric oscillator.
Experiments show that the wavelength of continuous seed light is the same as that of signal light, namely, compared with the traditional shortwave single-resonance optical parametric oscillator, the shortwave seed light is injected into the signal light single-resonance optical parametric oscillator, and the light emitting threshold value is from 0.58J/cm2The reduction is 0.5J/cm2The light-to-light conversion efficiency is increased from 3.62% to 4.69%; the wavelength of the continuous seed light is the same as that of the signal light, namely, the short wave seed light is injected into an idle frequency light single-resonance optical parametric oscillator (a long wave single-resonance optical parametric oscillator), and compared with the traditional long wave single-resonance optical parametric oscillator, the light emitting threshold is from 0.76J/cm2The reduction is 0.58J/cm2The light-to-light conversion efficiency increased from 1.48% to 3.42%. Namely, the light emitting threshold can be effectively reduced and the light-light conversion efficiency can be improved through the seed light injection.
The second embodiment is as follows: as described in detail with reference to fig. 3 and 4, the first embodiment differs from the second embodiment in that: the optical parametric oscillator is a signal light single-resonance optical parametric oscillator; the signal light single-resonance optical parametric oscillator is composed of a first cavity mirror 10-1, a second cavity mirror 10-2, a third cavity mirror 10-3, a nonlinear crystal 13, a beam expander 14 and a first output mirror 15;
when the wavelength of the continuous seed light is the same as that of the signal light, the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by the seed light comprises a first plano-convex lens 1, a fourth plano-convex lens 4, a first reflector 7, a signal light single-resonance optical parametric oscillator and a first dichroic mirror 18-1; the continuous seed light with the wavelength of 2.6 microns is incident to the plane of the first plano-convex lens 1, after the light beam of the first plano-convex lens 1 is converted, the continuous seed light is incident to the first reflecting mirror 7 at an angle of 45 degrees and is reflected to the first output mirror 15 by the first reflecting mirror 7, the seed light passing through the first output mirror 15 is incident to the first cavity mirror 10-1 at an angle of 45 degrees and is reflected to the nonlinear crystal 13 by the first cavity mirror 10-1; pulse pump light with the wavelength of 2.1 mu m is incident to the plane of the fourth plano-convex lens 4, is incident to the first cavity mirror 10-1 at an angle of 45 degrees after the light beam of the fourth plano-convex lens 4 is converted, and is incident to the nonlinear crystal 13 through the pump light of the first cavity mirror 10-1;
when the wavelength of the continuous seed light is the same as that of the idle frequency light, the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by the seed light comprises a second plano-convex lens 2, a fourth plano-convex lens 4, a second reflecting mirror 8, a signal light single-resonance optical parametric oscillator, a first dichroic mirror 18-1 and a second first dichroic mirror 18-2; the continuous seed light with the wavelength of 10 mu m is incident to the plane of the second plano-convex lens 2, is incident to the second reflecting mirror 8 at an angle of 45 degrees after the light beam of the second plano-convex lens 2 is converted, is reflected to the second first dichroic mirror 18-2 by the second reflecting mirror 8, is incident to the first cavity mirror 10-1 at an angle of 45 degrees after the seed light reflected by the second first dichroic mirror 18-2, and is incident to the nonlinear crystal 13 after the seed light passing through the first cavity mirror 10-1; pulse pump light with the wavelength of 2.1 mu m is incident to the plane of a fourth plano-convex lens 4, is incident to a second first dichroic mirror 18-2 at an angle of 45 degrees after the light beam of the fourth plano-convex lens 4 is converted, is incident to a first cavity mirror 10-1 at an angle of 45 degrees after passing through the second first dichroic mirror 18-2, and is incident to a nonlinear crystal 13 after passing through the first cavity mirror 10-1;
when the wavelength of the continuous seed light is the same as that of the signal light or the idler frequency light, part of the pump light incident to the nonlinear crystal 13 is nonlinearly converted with the seed light to generate signal light with a wavelength of 2.6 μm and idler frequency light with a wavelength of 10 μm; the residual pump light, the signal light with the wavelength of 2.6 mu m and the idler frequency light with the wavelength of 10 mu m are incident to a first cavity mirror 10-2 at an angle of 45 degrees, the residual pump light and the idler frequency light passing through the first cavity mirror 10-2 are incident to a first dichroic mirror 18-1 at an angle of 45 degrees, the pump light is transmitted out through the first dichroic mirror 18-1, the idler frequency light is reflected and output through the first dichroic mirror 18-1, the signal light with the wavelength of 2.6 mu m is reflected to a beam expanding mirror 14 through the first cavity mirror 10-2 and a first cavity mirror 10-3, the signal light after being expanded by the beam expanding mirror 14 is incident to a first output mirror 15 at an angle of 45 degrees, part of the signal light is transmitted out through the first output mirror 15, the residual signal light is reflected to a nonlinear crystal 13 through the first output mirror 15 and the first cavity mirror 10-1, and generates new signal light and new idler frequency light in the nonlinear crystal 13 together with part of the pump light and the seed light, the residual pump light, the new signal light and the new idler frequency light are incident to the second first cavity mirror 10-2 at an angle of 45 degrees, the new signal light is reflected to the third first cavity mirror 10-3 by the second first cavity mirror 10-2, the residual pump light and the new idler frequency light passing through the second first cavity mirror 10-2 are incident to the first dichroic mirror 18-1 at an angle of 45 degrees, the pump light is transmitted by the first dichroic mirror 18-1, and the new idler frequency light is reflected by the first dichroic mirror 18-1 and output. The rest is the same as the first embodiment.
The third concrete implementation mode: this embodiment is different from the first or second embodiment in that: when the wavelength of the continuous seed light is the same as that of the signal light: the light-passing surface of the first plano-convex lens 1 is plated with an antireflection film of 2.5-2.8 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the first reflector 7 is plated with a reflection increasing film of 2.5-2.8 μm, and the other surface is plated with a reflection increasing film of 2.5-2.8 μm; one surface of the first dichroic mirror 18-1 is simultaneously plated with an anti-reflection film of 1.8-2.2 microns and an anti-reflection film of 10-12 microns, and the other surface is simultaneously plated with an anti-reflection film of 1.8-2.2 microns and an anti-reflection film of 10-12 microns;
when the wavelength of the continuous seed light is the same as that of the idler light: the light-passing surface of the second plano-convex lens 2 is plated with an antireflection film of 10-12 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the second reflector 8 is plated with a reflection increasing film of 10-12 mu m, and the other surface is plated with a reflection increasing film of 10-12 mu m; one surfaces of the first dichroic mirror 18-1 and the second dichroic mirror 18-2 are simultaneously plated with an anti-reflection film of 1.8-2.2 μm and an anti-reflection film of 10-12 μm, and the other surfaces are simultaneously plated with an anti-reflection film of 1.8-2.2 μm and an anti-reflection film of 10-12 μm. The other is the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the light-passing surface of the fourth plano-convex lens 4 is plated with an antireflection film of 1.9-2.2 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surfaces of the first cavity mirror 10-1, the second cavity mirror 10-2 and the third cavity mirror 10-3 are simultaneously plated with a reflection increasing film of 2.5-2.8 mu m, an antireflection film of 1.9-2.2 mu m and an antireflection film of 10-12 mu m, and the other surfaces are simultaneously plated with an antireflection film of 1.9-2.2 mu m, an antireflection film of 2.5-2.8 mu m and an antireflection film of 10-12 mu m; the nonlinear crystal 13 is CdSe crystal or ZnGeP crystal2Crystal, BaGa4Se7A crystal or OP-GaAs crystal; the light-passing surface of the nonlinear crystal 13 is simultaneously plated with an antireflection film of 1.9-2.2 μm, an antireflection film of 2.5-2.8 μm and an antireflection film of 10-12 μm; the light passing surface of the beam expander 14 is plated with an antireflection film of 2.5-2.8 microns, the focal length is-10-1000 mm, and the diameter is 10-100 mm; one surface of the first output mirror 15 is plated with a partial reflection film with the reflectivity of 10% -90% for 2.5-2.8 μm, and the other surface is plated with an anti-reflection film with the reflectivity of 2.5-2.8 μm. The others are the same as the first to third embodiments.
The fifth concrete implementation mode: specifically, referring to fig. 5 and fig. 6, the difference between the present embodiment and one of the first to fourth embodiments is: the optical parametric oscillator is an idler frequency optical single-resonance optical parametric oscillator; the idle frequency light single-resonance optical parametric oscillator is composed of a first second cavity mirror 11-1, a second cavity mirror 11-2, a third second cavity mirror 11-3, a nonlinear crystal 13 and a second output mirror 16;
when the wavelength of the continuous seed light is the same as that of the signal light, the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by the seed light comprises a first plano-convex lens 1, a fifth plano-convex lens 5, a first reflector 7, an idler frequency light single-resonance optical parametric oscillator and a second dichroic mirror 19; the continuous seed light with the wavelength of 2.6 microns is incident to the plane of the first plano-convex lens 1, after the light beam is converted by the first plano-convex lens 1, the continuous seed light is incident to the first reflecting mirror 7 at an angle of 45 degrees and is reflected to the second dichroic mirror 19 by the first reflecting mirror 7, the seed light reflected by the second dichroic mirror 19 is incident to the first second cavity mirror 11-1 at an angle of 45 degrees, and the seed light passing through the first second cavity mirror 11-1 is incident to the nonlinear crystal 13; pulse pump light with the wavelength of 2.1 mu m is incident to the plane of the fifth plano-convex lens 5, is incident to the second dichroic mirror 19 at an angle of 45 degrees after the light beam of the fifth plano-convex lens 5 is converted, is incident to the first second cavity mirror 11-1 at an angle of 45 degrees after passing through the second dichroic mirror 19, and is incident to the nonlinear crystal 13 after passing through the first second cavity mirror 11-1;
when the wavelength of the continuous seed light is the same as that of the idler frequency light, the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by the seed light comprises a second plano-convex lens 2, a fifth plano-convex lens 5, a second reflecting mirror 8 and an idler frequency light single-resonance optical parametric oscillator; the continuous seed light with the wavelength of 10 mu m is incident to the plane of the second plano-convex lens 2, is incident to the second reflecting mirror 8 at an angle of 45 degrees after the light beam of the second plano-convex lens 2 is converted, is reflected to the second output mirror 16 by the second reflecting mirror 8, is incident to the first second cavity mirror 11-1 at an angle of 45 degrees after passing through the second output mirror 16, and is reflected to the nonlinear crystal 13 by the first second cavity mirror 11-1; pulse pump light with the wavelength of 2.1 mu m is incident to the plane of the fifth plano-convex lens 5, is incident to the first second cavity mirror 11-1 at an angle of 45 degrees after the light beam of the fifth plano-convex lens 5 is converted, and is incident to the nonlinear crystal 13 through the pump light of the first second cavity mirror 11-1;
when the wavelength of the continuous seed light is the same as that of the signal light or the idler frequency light, part of the pump light incident to the nonlinear crystal 13 is nonlinearly converted with the seed light to generate signal light with a wavelength of 2.6 μm and idler frequency light with a wavelength of 10 μm; the signal light with the wavelength of 2.6 μm and the residual pump light are transmitted out through the second cavity mirror 11-2, the idler light with the wavelength of 10 μm is reflected to the second output mirror 16 through the second cavity mirror 11-2 and the third cavity mirror 11-3, part of the idler light is output through the second output mirror 16, the residual idler light is reflected to the nonlinear crystal 13 through the second output mirror 16 and the first cavity mirror 11-1, and a new signal light and a new idler frequency light are generated in the nonlinear crystal 13 together with part of the pump light and the seed light, the new signal light and the residual pump light are transmitted out through the second cavity mirror 11-2, the new idler frequency light is reflected to the second output mirror 16 through the second cavity mirror 11-2 and the third cavity mirror 11-3, part of the new idler frequency light is output through the second output mirror 16, and the residual new idler frequency light is reflected to the nonlinear crystal 13 through the second output mirror 16 and the first cavity mirror 11-1. The rest is the same as the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: when the wavelength of the continuous seed light is the same as that of the signal light: the light-passing surface of the first plano-convex lens 1 is plated with an antireflection film of 2.5-2.8 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the first reflector 7 is plated with a reflection increasing film of 2.5-2.8 μm, and the other surface is plated with a reflection increasing film of 2.5-2.8 μm; one side of the second dichroic mirror 19 is simultaneously plated with an anti-reflection film of 1.8-2.2 μm and an anti-reflection film of 2.5-2.8 μm, and the other side is simultaneously plated with an anti-reflection film of 1.8-2.2 μm and an anti-reflection film of 2.5-2.8 μm;
when the wavelength of the continuous seed light is the same as that of the idler light: the light-passing surface of the second plano-convex lens 2 is plated with an antireflection film of 10-12 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the second reflector 8 is plated with a reflection increasing film of 10-12 mu m, and the other surface is plated with a reflection increasing film of 10-12 mu m. The rest is the same as the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the light-passing surface of the fifth plano-convex lens 5 is plated with an antireflection film of 1.9-2.2 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surfaces of the first second cavity mirror 11-1, the second cavity mirror 11-2 and the third second cavity mirror 11-3 are simultaneously plated with a reflection increasing film of 10 mu m to 12 mu m, an antireflection film of 1.9 mu m to 2.2 mu m and an antireflection film of 2.5 mu m to 2.8 mu m, and the other surfaces are simultaneously plated with an antireflection film of 1.9 mu m to 2.2 mu m, an antireflection film of 2.5 mu m to 2.8 mu m and an antireflection film of 10 mu m to 12 mu m; the nonlinear crystal 13 is CdSe crystal or ZnGeP crystal2Crystal, BaGa4Se7A crystal or OP-GaAs crystal; the light-passing surface of the nonlinear crystal 13 is simultaneously plated with an antireflection film of 1.9-2.2 μm, an antireflection film of 2.5-2.8 μm and an antireflection film of 10-12 μm; one surface of the second output mirror 16 is plated with a partial reflection film with the reflectivity of 10-90% for 10-12 μm, and the other surface is plated with an anti-reflection film with the reflectivity of 10-12 μm. The others are the same as the first to sixth embodiments.
The specific implementation mode is eight: specifically, referring to fig. 7, the difference between this embodiment and one of the first to seventh embodiments is: the optical parametric oscillator is a double-resonance optical parametric oscillator; the double-resonance optical parametric oscillator consists of a first third cavity mirror 12-1, a second third cavity mirror 12-2, a third cavity mirror 12-3, a nonlinear crystal 13 and a third output mirror 17;
the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by seed light comprises a third plano-convex lens 3, a sixth plano-convex lens 6, a third reflector 9, a double-resonance optical parametric oscillator and a third dichroic mirror 20;
the continuous seed light with the wavelength of 2.6 microns or 10 microns is incident to the plane of the third planoconvex lens 3, after the light beam of the third planoconvex lens 3 is converted, the continuous seed light is incident to the third reflector 9 at an angle of 45 degrees and is reflected to the third output mirror 17 by the third reflector 9, the seed light which passes through the third output mirror 17 is incident to the first third cavity mirror 12-1 at an angle of 45 degrees and is reflected to the nonlinear crystal 13 by the first third cavity mirror 12-1; pulse pump light with the wavelength of 2.1 mu m is incident to the plane of the sixth plano-convex lens 6, is incident to the first third cavity mirror 12-1 at an angle of 45 degrees after the light beam of the sixth plano-convex lens 6 is converted, and is incident to the nonlinear crystal 13 through the pump light of the first third cavity mirror 12-1;
part of the pump light and the seed light which are incident to the nonlinear crystal 13 are subjected to nonlinear conversion to generate signal light with the wavelength of 2.6 mu m and idler frequency light with the wavelength of 10 mu m; the rest of the pump light is transmitted by the second third cavity mirror 12-2, the signal light with the wavelength of 2.6 μm and the idler light with the wavelength of 10 μm are reflected to the third output mirror 17 by the second third cavity mirror 12-2 and the third cavity mirror 12-3, part of the signal light and part of the idler light are output by the third output mirror 17, the signal light output from the third output mirror 17 is reflected and output by the third dichroic mirror 20, the idler light output from the third output mirror 17 is transmitted and output by the third dichroic mirror 20, the rest of the idler light and the rest of the signal light are reflected to the nonlinear crystal 13 by the third output mirror 17 and the first third cavity mirror 12-1, and generate new signal light and new idler light in the nonlinear crystal 13 together with part of the pump light and the seed light, the rest of the pump light is transmitted by the second third cavity mirror 12-2, and the new idler light are reflected to the third output mirror 17 by the third cavity mirror 12-2 and the third cavity mirror 12-3, part of new signal light and part of new idler light are output through the third output mirror 17, new signal light output from the third output mirror 17 is output through reflection of the third dichroic mirror 20, new idler light output from the third output mirror 17 is output through transmission of the third dichroic mirror 20, and the rest of new idler light and the rest of new signal light are output through reflection of the third output mirror 17 and the first third cavity mirror 12-1 to the nonlinear crystal 13. The rest is the same as the first to seventh embodiments.
The wavelength of the continuous seed light described in this embodiment is the same as that of the signal light or the idler light.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: the light-passing surface of the third planoconvex lens 3 is simultaneously plated with an antireflection film of 2.5-2.8 microns and an antireflection film of 10-12 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the third reflector 9 is simultaneously plated with a reflection increasing film of 2.5-2.8 μm and a reflection increasing film of 10-12 μm, and the other surface is simultaneously plated with an anti-reflection film of 2.5-2.8 μm and an anti-reflection film of 10-12 μm; the light-passing surface of the sixth plano-convex lens 6 is plated with an antireflection film of 1.9-2.2 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surfaces of the first cavity mirror 12-1, the second cavity mirror 12-2 and the third cavity mirror 12-3 are simultaneously plated with a reflection increasing film of 2.5-2.8 mu m, a reflection increasing film of 10-12 mu m and an anti-reflection film of 1.9-2.2 mu m, and the other surfaces are simultaneously plated with an anti-reflection film of 1.9-2.2 mu m, an anti-reflection film of 2.5-2.8 mu m and an anti-reflection film of 10-12 mu m; the nonlinear crystal 13 is CdSe crystal or ZnGeP crystal2Crystal, BaGa4Se7A crystal or OP-GaAs crystal; the light-passing surface of the nonlinear crystal 13 is simultaneously plated with an antireflection film of 1.9-2.2 μm, an antireflection film of 2.5-2.8 μm and an antireflection film of 10-12 μm; one surface of the third output mirror 17 is simultaneously plated with a partial reflection film with the reflectivity of 10% -90% for 2.5-2.8 μm and a partial reflection film with the reflectivity of 10% -90% for 10-12 μm, and the other surface is plated with an anti-reflection film with the reflectivity of 2.5-2.8 μm and an anti-reflection film with the reflectivity of 10-12 μm; one side of the third dichroic mirror 20 is simultaneously plated with a reflection increasing film of 2.5-2.8 μm and a reflection increasing film of 10-12 μm, and the other side is simultaneously plated with a reflection increasing film of 2.5-2.8 μmA transparent film and an antireflection film with the thickness of 10-12 mu m. The other points are the same as those in the first to eighth embodiments.
The following examples were used to demonstrate the beneficial effects of the present invention:
in the first embodiment, specifically described with reference to fig. 3, the short-wave seed light injection short-wave single-resonance optical parametric oscillator:
the optical parametric oscillator is a signal light single-resonance optical parametric oscillator; the signal light single-resonance optical parametric oscillator is composed of a first cavity mirror 10-1, a second cavity mirror 10-2, a third cavity mirror 10-3, a nonlinear crystal 13, a beam expander 14 and a first output mirror 15;
the wavelength of the continuous seed light is the same as that of the signal light, and the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by the seed light comprises a first plano-convex lens 1, a fourth plano-convex lens 4, a first reflector 7, a signal light single-resonance optical parametric oscillator and a first dichroic mirror 18-1; the continuous seed light with the wavelength of 2.6 microns is incident to the plane of the first plano-convex lens 1, after the light beam of the first plano-convex lens 1 is converted, the continuous seed light is incident to the first reflecting mirror 7 at an angle of 45 degrees and is reflected to the first output mirror 15 by the first reflecting mirror 7, the seed light passing through the first output mirror 15 is incident to the first cavity mirror 10-1 at an angle of 45 degrees and is reflected to the nonlinear crystal 13 by the first cavity mirror 10-1; pulse pump light with the wavelength of 2.1 mu m is incident to the plane of the fourth plano-convex lens 4, is incident to the first cavity mirror 10-1 at an angle of 45 degrees after the light beam of the fourth plano-convex lens 4 is converted, and is incident to the nonlinear crystal 13 through the pump light of the first cavity mirror 10-1;
part of the pump light and the seed light which are incident to the nonlinear crystal 13 are subjected to nonlinear conversion to generate signal light with the wavelength of 2.6 mu m and idler frequency light with the wavelength of 10 mu m; the residual pump light, the signal light with the wavelength of 2.6 mu m and the idler frequency light with the wavelength of 10 mu m are incident to a first cavity mirror 10-2 at an angle of 45 degrees, the residual pump light and the idler frequency light passing through the first cavity mirror 10-2 are incident to a first dichroic mirror 18-1 at an angle of 45 degrees, the pump light is transmitted out through the first dichroic mirror 18-1, the idler frequency light is reflected and output through the first dichroic mirror 18-1, the signal light with the wavelength of 2.6 mu m is reflected to a beam expanding mirror 14 through the first cavity mirror 10-2 and a first cavity mirror 10-3, the signal light after being expanded by the beam expanding mirror 14 is incident to a first output mirror 15 at an angle of 45 degrees, part of the signal light is transmitted out through the first output mirror 15, the residual signal light is reflected to a nonlinear crystal 13 through the first output mirror 15 and the first cavity mirror 10-1, and generates new signal light and new idler frequency light in the nonlinear crystal 13 together with part of the pump light and the seed light, the residual pump light, the new signal light and the new idler frequency light are incident to a second first cavity mirror 10-2 at an angle of 45 degrees, the new signal light is reflected to a third first cavity mirror 10-3 by the second first cavity mirror 10-2, the residual pump light and the new idler frequency light passing through the second first cavity mirror 10-2 are incident to a first dichroic mirror 18-1 at an angle of 45 degrees, the pump light is transmitted by the first dichroic mirror 18-1, and the new idler frequency light is reflected and output by the first dichroic mirror 18-1;
the light-passing surface of the first plano-convex lens 1 is plated with an antireflection film of 2.5-2.8 microns, the focal length is 127mm, and the diameter is 15 mm; one surface of the first reflector 7 is plated with a reflection increasing film of 2.5-2.8 μm, and the other surface is plated with a reflection increasing film of 2.5-2.8 μm; one surface of the first dichroic mirror 18-1 is simultaneously plated with an anti-reflection film of 1.8-2.2 microns and an anti-reflection film of 10-12 microns, and the other surface is simultaneously plated with an anti-reflection film of 1.8-2.2 microns and an anti-reflection film of 10-12 microns;
the light-passing surface of the fourth plano-convex lens 4 is plated with an antireflection film of 1.9-2.2 microns, the focal length is 150mm, and the diameter is 10 mm; one surfaces of the first cavity mirror 10-1, the second cavity mirror 10-2 and the third cavity mirror 10-3 are simultaneously plated with a reflection increasing film of 2.5-2.8 mu m, an antireflection film of 1.9-2.2 mu m and an antireflection film of 10-12 mu m, and the other surfaces are simultaneously plated with an antireflection film of 1.9-2.2 mu m, an antireflection film of 2.5-2.8 mu m and an antireflection film of 10-12 mu m; the nonlinear crystal 13 is a CdSe crystal; the light-passing surface of the nonlinear crystal 13 is simultaneously plated with an antireflection film of 1.9-2.2 μm, an antireflection film of 2.5-2.8 μm and an antireflection film of 10-12 μm; the light-passing surface of the beam expander 14 is plated with an antireflection film of 2.5-2.8 microns, the focal length is-150 mm, and the diameter is 10 mm; one surface of the first output mirror 15 is plated with a partial reflection film with the reflectivity of 40 percent for 2.5-2.8 μm, and the other surface is plated with an anti-reflection film with the reflectivity of 2.5-2.8 μm.
Short wave seed light injection short wave single-resonance optical parametric oscillator and traditional short wave single-resonance opticsCompared with a parametric oscillator, the light extraction threshold is from 0.58J/cm2The reduction is 0.5J/cm2The light-to-light conversion efficiency increased from 3.62% to 4.69%.
In the second embodiment, specifically described with reference to fig. 5, the short-wave seed light is injected into the long-wave single-resonance optical parametric oscillator:
the optical parametric oscillator is an idler frequency optical single-resonance optical parametric oscillator; the idle frequency light single-resonance optical parametric oscillator is composed of a first second cavity mirror 11-1, a second cavity mirror 11-2, a third second cavity mirror 11-3, a nonlinear crystal 13 and a second output mirror 16;
when the wavelength of the continuous seed light is the same as that of the signal light, the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by the seed light comprises a first plano-convex lens 1, a fifth plano-convex lens 5, a first reflector 7, an idler frequency light single-resonance optical parametric oscillator and a second dichroic mirror 19; the continuous seed light with the wavelength of 2.6 microns is incident to the plane of the first plano-convex lens 1, after the light beam is converted by the first plano-convex lens 1, the continuous seed light is incident to the first reflecting mirror 7 at an angle of 45 degrees and is reflected to the second dichroic mirror 19 by the first reflecting mirror 7, the seed light reflected by the second dichroic mirror 19 is incident to the first second cavity mirror 11-1 at an angle of 45 degrees, and the seed light passing through the first second cavity mirror 11-1 is incident to the nonlinear crystal 13; pulse pump light with the wavelength of 2.1 mu m is incident to the plane of the fifth plano-convex lens 5, is incident to the second dichroic mirror 19 at an angle of 45 degrees after the light beam of the fifth plano-convex lens 5 is converted, is incident to the first second cavity mirror 11-1 at an angle of 45 degrees after passing through the second dichroic mirror 19, and is incident to the nonlinear crystal 13 after passing through the first second cavity mirror 11-1;
part of the pump light and the seed light which are incident to the nonlinear crystal 13 are subjected to nonlinear conversion to generate signal light with the wavelength of 2.6 mu m and idler frequency light with the wavelength of 10 mu m; the signal light with the wavelength of 2.6 μm and the residual pump light are transmitted out through the second cavity mirror 11-2, the idler light with the wavelength of 10 μm is reflected to the second output mirror 16 through the second cavity mirror 11-2 and the third cavity mirror 11-3, part of the idler light is output through the second output mirror 16, the residual idler light is reflected to the nonlinear crystal 13 through the second output mirror 16 and the first cavity mirror 11-1, a new signal light and a new idler frequency light are generated in the nonlinear crystal 13 together with part of the pump light and the seed light, the new signal light and the residual pump light are transmitted out through the second cavity mirror 11-2, the new idler frequency light is reflected to the second output mirror 16 through the second cavity mirror 11-2 and the third cavity mirror 11-3, part of the new idler frequency light is output through the second output mirror 16, and the residual new idler frequency light is reflected to the nonlinear crystal 13 through the second output mirror 16 and the first cavity mirror 11-1;
the light-passing surface of the first plano-convex lens 1 is plated with an antireflection film of 2.5-2.8 microns, the focal length is 127mm, and the diameter is 15 mm; one surface of the first reflector 7 is plated with a reflection increasing film of 2.5-2.8 μm, and the other surface is plated with a reflection increasing film of 2.5-2.8 μm; one side of the second dichroic mirror 19 is simultaneously plated with an anti-reflection film of 1.8-2.2 μm and an anti-reflection film of 2.5-2.8 μm, and the other side is simultaneously plated with an anti-reflection film of 1.8-2.2 μm and an anti-reflection film of 2.5-2.8 μm;
the light transmitting surface of the fifth plano-convex lens 5 is plated with an antireflection film of 1.9-2.2 microns, the focal length is 150mm, and the diameter is 10 mm; one surfaces of the first second cavity mirror 11-1, the second cavity mirror 11-2 and the third second cavity mirror 11-3 are simultaneously plated with a reflection increasing film of 10 mu m to 12 mu m, an antireflection film of 1.9 mu m to 2.2 mu m and an antireflection film of 2.5 mu m to 2.8 mu m, and the other surfaces are simultaneously plated with an antireflection film of 1.9 mu m to 2.2 mu m, an antireflection film of 2.5 mu m to 2.8 mu m and an antireflection film of 10 mu m to 12 mu m; the nonlinear crystal 13 is a CdSe crystal; the light-passing surface of the nonlinear crystal 13 is simultaneously plated with an antireflection film of 1.9-2.2 μm, an antireflection film of 2.5-2.8 μm and an antireflection film of 10-12 μm; one side of the second output mirror 16 is plated with a partial reflection film with the reflectivity of 55 percent for 10-12 mu m, and the other side is plated with an anti-reflection film with the reflectivity of 10-12 mu m.
Compared with the traditional long-wave single-resonance optical parametric oscillator, the short-wave seed light injection long-wave single-resonance optical parametric oscillator has the light emitting threshold value of 0.76J/cm2The reduction is 0.58J/cm2The light-to-light conversion efficiency increased from 1.48% to 3.42%. Namely, the light emitting threshold can be effectively reduced and the light-light conversion efficiency can be improved through the seed light injection.
Claims (9)
1. The 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by seed light is characterized in that the continuous seed light and a beam of pulse pumping light are simultaneously injected into the optical parametric oscillator, and the continuous seed light and the pulse pumping light generate signal light and idler frequency light through the optical parametric oscillator; the wavelength of the continuous seed light is the same as that of the signal light or the idler frequency light.
2. The seed light injected long-wave infrared optical parametric oscillator with wavelength of 10-12 μm according to claim 1, wherein the optical parametric oscillator is a signal light single-resonance optical parametric oscillator; the signal light single-resonance optical parametric oscillator is composed of a first cavity mirror (10-1), a second cavity mirror (10-2), a third cavity mirror (10-3), a nonlinear crystal (13), a beam expanding mirror (14) and a first output mirror (15);
when the wavelength of the continuous seed light is the same as that of the signal light, the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by the seed light comprises a first plano-convex lens (1), a fourth plano-convex lens (4), a first reflector (7), a signal light single-resonance optical parametric oscillator and a first dichroic mirror (18-1); continuous seed light with the wavelength of 2.6 mu m is incident to the plane of the first plano-convex lens (1), after the light beam is converted by the first plano-convex lens (1), the continuous seed light is incident to the first reflector (7) at an angle of 45 degrees and is reflected to the first output mirror (15) by the first reflector (7), the seed light passing through the first output mirror (15) is incident to the first cavity mirror (10-1) at an angle of 45 degrees and is reflected to the nonlinear crystal (13) by the first cavity mirror (10-1); pulse pump light with the wavelength of 2.1 mu m is incident to the plane of the fourth plano-convex lens (4), is incident to the first cavity mirror (10-1) at an angle of 45 degrees after the light beam of the fourth plano-convex lens (4) is converted, and is incident to the nonlinear crystal (13) through the pump light of the first cavity mirror (10-1);
when the wavelength of the continuous seed light is the same as that of the idler frequency light, the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by the seed light comprises a second plano-convex lens (2), a fourth plano-convex lens (4), a second reflecting mirror (8), a signal light single-resonance optical parametric oscillator, a first dichroic mirror (18-1) and a second first dichroic mirror (18-2); the continuous seed light with the wavelength of 10 mu m is incident to the plane of the second plano-convex lens (2), is incident to the second reflecting mirror (8) at an angle of 45 degrees after the light beam of the second plano-convex lens (2) is converted, is reflected to the second first dichroic mirror (18-2) by the second reflecting mirror (8), is incident to the first cavity mirror (10-1) at an angle of 45 degrees after the seed light reflected by the second first dichroic mirror (18-2), and is incident to the nonlinear crystal (13) after the seed light passes through the first cavity mirror (10-1); pulse pump light with the wavelength of 2.1 mu m is incident to the plane of a fourth plano-convex lens (4), after the light beam is converted by the fourth plano-convex lens (4), the pulse pump light is incident to a second first dichroic mirror (18-2) at an angle of 45 degrees, the pump light passing through the second first dichroic mirror (18-2) is incident to a first cavity mirror (10-1) at an angle of 45 degrees, and the pump light passing through the first cavity mirror (10-1) is incident to a nonlinear crystal (13);
when the wavelength of the continuous seed light is the same as that of the signal light or the idler frequency light, part of the pump light incident to the nonlinear crystal (13) is subjected to nonlinear conversion with the seed light to generate signal light with the wavelength of 2.6 mu m and idler frequency light with the wavelength of 10 mu m; the residual pump light, the signal light with the wavelength of 2.6 mu m and the idler light with the wavelength of 10 mu m are incident to a first cavity mirror (10-2) at an angle of 45 degrees, the residual pump light and the idler light passing through the first cavity mirror (10-2) are incident to a first cavity mirror (18-1) at an angle of 45 degrees, the pump light is transmitted by the first cavity mirror (18-1), the idler light is reflected and output by the first cavity mirror (18-1), the signal light with the wavelength of 2.6 mu m is reflected to a beam expanding mirror (14) by the first cavity mirror (10-2) and a first cavity mirror (10-3), the signal light after being expanded by the beam expanding mirror (14) is incident to a first output mirror (15) at an angle of 45 degrees, part of the signal light is transmitted by the first output mirror (15), and the residual signal light is reflected to a nonlinear crystal (13) by the first output mirror (15) and the first cavity mirror (10-1), and a part of pump light and seed light generate new signal light and new idler frequency light in a nonlinear crystal (13), the residual pump light, the new signal light and the new idler frequency light are incident to a second first cavity mirror (10-2) at an angle of 45 degrees, the new signal light is reflected to a third first cavity mirror (10-3) by the second first cavity mirror (10-2), the residual pump light and the new idler frequency light passing through the second first cavity mirror (10-2) are incident to a first dichroic mirror (18-1) at an angle of 45 degrees, the pump light is transmitted by the first dichroic mirror (18-1), and the new idler frequency light is reflected and output by the first dichroic mirror (18-1).
3. The seed light injected 10-12 μm wavelength band long wave infrared optical parametric oscillator of claim 2, wherein when the wavelength of the continuous seed light is the same as the signal light: the light transmission surface of the first plano-convex lens (1) is plated with an antireflection film of 2.5-2.8 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the first reflector (7) is plated with a reflection increasing film of 2.5-2.8 μm, and the other surface is plated with a reflection increasing film of 2.5-2.8 μm; one side of a first dichroic mirror (18-1) is simultaneously plated with an anti-reflection film of 1.8-2.2 mu m and an anti-reflection film of 10-12 mu m, and the other side is simultaneously plated with an anti-reflection film of 1.8-2.2 mu m and an anti-reflection film of 10-12 mu m;
when the wavelength of the continuous seed light is the same as that of the idler light: the light passing surface of the second plano-convex lens (2) is plated with an antireflection film of 10-12 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the second reflector (8) is plated with a reflection increasing film of 10-12 mu m, and the other surface is plated with a reflection increasing film of 10-12 mu m; one surfaces of the first dichroic mirror (18-1) and the second dichroic mirror (18-2) are simultaneously plated with an anti-reflection film of 1.8-2.2 microns and a reflection increasing film of 10-12 microns, and the other surfaces are simultaneously plated with an anti-reflection film of 1.8-2.2 microns and a reflection increasing film of 10-12 microns.
4. The seed light injected 10-12 μm waveband long-wave infrared optical parametric oscillator according to claim 2, characterized in that the light-passing surface of the fourth plano-convex lens (4) is plated with 1.9-2.2 μm antireflection film, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surfaces of the first cavity mirror (10-1), the second cavity mirror (10-2) and the third cavity mirror (10-3) are simultaneously plated with a reflection increasing film of 2.5-2.8 mu m, an antireflection film of 1.9-2.2 mu m and an antireflection film of 10-12 mu m, and the other surfaces are simultaneously plated with an antireflection film of 1.9-2.2 mu m, an antireflection film of 2.5-2.8 mu m and an antireflection film of 10-12 mu m; the nonlinear crystal (13) is CdSe crystal or ZnGeP crystal2Crystal, BaGa4Se7A crystal or OP-GaAs crystal; the light transmission surface of the nonlinear crystal (13) is simultaneously plated with an antireflection film of 1.9-2.2 μm, an antireflection film of 2.5-2.8 μm and an antireflection film of 10-12 μm; the light passing surface of the beam expander (14) is plated with an antireflection film of 2.5-2.8 mu m, and the focal length is-10 mm-1000mm, the diameter is 10 mm-100 mm; one surface of the first output mirror (15) is plated with a partial reflection film with the reflectivity of 10% -90% for 2.5-2.8 μm, and the other surface is plated with an anti-reflection film with the reflectivity of 2.5-2.8 μm.
5. The seed light injected 10-12 μm waveband long wave infrared optical parametric oscillator of claim 1, characterized in that the optical parametric oscillator is an idler optical single-resonance optical parametric oscillator; the idler frequency single-resonance optical parametric oscillator is composed of a first second cavity mirror (11-1), a second cavity mirror (11-2), a third second cavity mirror (11-3), a nonlinear crystal (13) and a second output mirror (16);
when the wavelength of the continuous seed light is the same as that of the signal light, the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by the seed light comprises a first plano-convex lens (1), a fifth plano-convex lens (5), a first reflector (7), an idler frequency light single-resonance optical parametric oscillator and a second dichroic mirror (19); continuous seed light with the wavelength of 2.6 mu m is incident to the plane of the first plano-convex lens (1), after the light beam is converted by the first plano-convex lens (1), the continuous seed light is incident to the first reflecting mirror (7) at an angle of 45 degrees and is reflected to the second dichroic mirror (19) by the first reflecting mirror (7), the seed light reflected by the second dichroic mirror (19) is incident to the first second cavity mirror (11-1) at an angle of 45 degrees, and the seed light passing through the first second cavity mirror (11-1) is incident to the nonlinear crystal (13); pulse pump light with the wavelength of 2.1 mu m is incident to the plane of a fifth plano-convex lens (5), is incident to a second dichroic mirror (19) at an angle of 45 degrees after the light beam of the fifth plano-convex lens (5) is converted, the pump light passing through the second dichroic mirror (19) is incident to a first second cavity mirror (11-1) at an angle of 45 degrees, and the pump light passing through the first second cavity mirror (11-1) is incident to a nonlinear crystal (13);
when the wavelength of the continuous seed light is the same as that of the idler frequency light, the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by the seed light comprises a second plano-convex lens (2), a fifth plano-convex lens (5), a second reflector (8) and an idler frequency light single-resonance optical parametric oscillator; the continuous seed light with the wavelength of 10 mu m is incident to the plane of the second plano-convex lens (2), after the light beam transformation of the second plano-convex lens (2), the continuous seed light is incident to the second reflector (8) at an angle of 45 degrees and is reflected to the second output mirror (16) by the second reflector (8), the seed light passing through the second output mirror (16) is incident to the first second cavity mirror (11-1) at an angle of 45 degrees and is reflected to the nonlinear crystal (13) by the first second cavity mirror (11-1); pulse pump light with the wavelength of 2.1 mu m is incident to the plane of the fifth plano-convex lens (5), is incident to the first second cavity mirror (11-1) at an angle of 45 degrees after the light beam of the fifth plano-convex lens (5) is converted, and is incident to the nonlinear crystal (13) through the pump light of the first second cavity mirror (11-1);
when the wavelength of the continuous seed light is the same as that of the signal light or the idler frequency light, part of the pump light incident to the nonlinear crystal (13) is subjected to nonlinear conversion with the seed light to generate signal light with the wavelength of 2.6 mu m and idler frequency light with the wavelength of 10 mu m; the signal light with the wavelength of 2.6 mu m and the residual pump light are transmitted by the second cavity mirror (11-2), the idler light with the wavelength of 10 mu m is reflected to the second output mirror (16) by the second cavity mirror (11-2) and the third cavity mirror (11-3), part of the idler light is output by the second output mirror (16), the residual idler light is reflected to the nonlinear crystal (13) by the second output mirror (16) and the first cavity mirror (11-1), and generates new signal light and new idler light together with part of the pump light and the seed light in the nonlinear crystal (13), the new signal light and the residual pump light are transmitted by the second cavity mirror (11-2), the new idler light is reflected to the second output mirror (16) by the second cavity mirror (11-2) and the third cavity mirror (11-3), and part of the new idler light is output by the second output mirror (16), the rest new idler frequency light is reflected to the nonlinear crystal (13) through the second output mirror (16) and the first cavity mirror (11-1).
6. The seed light injected 10-12 μm wavelength band long wave infrared optical parametric oscillator of claim 5, wherein when the wavelength of the continuous seed light is the same as the signal light: the light transmission surface of the first plano-convex lens (1) is plated with an antireflection film of 2.5-2.8 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the first reflector (7) is plated with a reflection increasing film of 2.5-2.8 μm, and the other surface is plated with a reflection increasing film of 2.5-2.8 μm; one side of the second dichroic mirror (19) is simultaneously plated with an anti-reflection film of 1.8-2.2 μm and a reflection increasing film of 2.5-2.8 μm, and the other side is simultaneously plated with an anti-reflection film of 1.8-2.2 μm and a reflection increasing film of 2.5-2.8 μm;
when the wavelength of the continuous seed light is the same as that of the idler light: the light passing surface of the second plano-convex lens (2) is plated with an antireflection film of 10-12 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the second reflector (8) is plated with a reflection increasing film of 10-12 mu m, and the other surface is plated with a reflection increasing film of 10-12 mu m.
7. The seed light injected long-wave infrared optical parametric oscillator with wave bands of 10-12 μm according to claim 5, characterized in that the light passing surface of the fifth plano-convex lens (5) is plated with an antireflection film of 1.9-2.2 μm, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the first second cavity mirror (11-1), one surface of the second cavity mirror (11-2) and one surface of the third second cavity mirror (11-3) are simultaneously plated with a reflection increasing film of 10-12 microns, an antireflection film of 1.9-2.2 microns and an antireflection film of 2.5-2.8 microns, and the other surface of the first second cavity mirror is simultaneously plated with an antireflection film of 1.9-2.2 microns, an antireflection film of 2.5-2.8 microns and an antireflection film of 10-12 microns; the nonlinear crystal (13) is CdSe crystal or ZnGeP crystal2Crystal, BaGa4Se7A crystal or OP-GaAs crystal; the light transmission surface of the nonlinear crystal (13) is simultaneously plated with an antireflection film of 1.9-2.2 μm, an antireflection film of 2.5-2.8 μm and an antireflection film of 10-12 μm; one surface of the second output mirror (16) is plated with a partial reflection film with the reflectivity of 10-90% for 10-12 μm, and the other surface is plated with an anti-reflection film with the reflectivity of 10-12 μm.
8. The seed light injected 10-12 μm waveband long-wave infrared optical parametric oscillator of claim 1, characterized in that the optical parametric oscillator is a dual-resonant optical parametric oscillator; the double-resonance optical parametric oscillator is composed of a first third cavity mirror (12-1), a second third cavity mirror (12-2), a third cavity mirror (12-3), a nonlinear crystal (13) and a third output mirror (17);
the 10-12 mu m waveband long-wave infrared optical parametric oscillator injected by seed light comprises a third plano-convex lens (3), a sixth plano-convex lens (6), a third reflector (9), a double-resonance optical parametric oscillator and a third dichroic mirror (20);
the continuous seed light with the wavelength of 2.6 mu m or 10 mu m is incident to the plane of the third planoconvex lens (3), after the light beam is converted by the third planoconvex lens (3), the continuous seed light is incident to the third reflector (9) at an angle of 45 degrees and is reflected to the third output mirror (17) by the third reflector (9), the seed light which passes through the third output mirror (17) is incident to the first third cavity mirror (12-1) at an angle of 45 degrees and is reflected to the nonlinear crystal (13) by the first third cavity mirror (12-1); pulse pump light with the wavelength of 2.1 mu m is incident to the plane of the sixth plano-convex lens (6), is incident to the first third cavity mirror (12-1) at an angle of 45 degrees after the light beam of the sixth plano-convex lens (6) is converted, and is incident to the nonlinear crystal (13) through the pump light of the first third cavity mirror (12-1);
part of the pump light and the seed light which are incident to the nonlinear crystal (13) are subjected to nonlinear conversion to generate signal light with the wavelength of 2.6 mu m and idler frequency light with the wavelength of 10 mu m; the residual pump light is transmitted by a second third cavity mirror (12-2), the signal light with the wavelength of 2.6 mu m and the idler light with the wavelength of 10 mu m are reflected to a third output mirror (17) by the second third cavity mirror (12-2) and the third cavity mirror (12-3), part of the signal light and part of the idler light are output by the third output mirror (17), the signal light output from the third output mirror (17) is reflected and output by a third dichroic mirror (20), the idler light output from the third output mirror (17) is transmitted and output by the third dichroic mirror (20), the residual idler light and residual signal light are reflected to a nonlinear crystal (13) by the third output mirror (17) and a first third cavity mirror (12-1), and generate new signal light and new idler light with part of the pump light and seed light in the nonlinear crystal (13), and the residual pump light is transmitted by the second third cavity mirror (12-2), the new signal light and the new idler light are reflected to a third output mirror (17) through a second third cavity mirror (12-2) and a third cavity mirror (12-3), part of the new signal light and part of the new idler light are output through the third output mirror (17), the new signal light output from the third output mirror (17) is reflected and output through a third dichroic mirror (20), the new idler light output from the third output mirror (17) is transmitted and output through the third dichroic mirror (20), and the rest of the new idler light and the rest of the new signal light are reflected to a nonlinear crystal (13) through the third output mirror (17) and a first third cavity mirror (12-1).
9. The method of claim 8The 10-12 mu m waveband long-wave infrared optical parametric oscillator for seed light injection is characterized in that the light passing surface of the third planoconvex lens (3) is simultaneously plated with 2.5-2.8 mu m antireflection film and 10-12 mu m antireflection film, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the third reflector (9) is simultaneously plated with a reflection increasing film of 2.5-2.8 mu m and a reflection increasing film of 10-12 mu m, and the other surface is simultaneously plated with an anti-reflection film of 2.5-2.8 mu m and an anti-reflection film of 10-12 mu m; the light passing surface of the sixth plano-convex lens (6) is plated with an antireflection film of 1.9-2.2 microns, the focal length is 10-1000 mm, and the diameter is 10-100 mm; one surface of the first third cavity mirror (12-1), the second third cavity mirror (12-2) and the third cavity mirror (12-3) is simultaneously plated with a reflection increasing film of 2.5-2.8 mu m, a reflection increasing film of 10-12 mu m and an antireflection film of 1.9-2.2 mu m, and the other surface of the first third cavity mirror, the second third cavity mirror and the third cavity mirror is simultaneously plated with an antireflection film of 1.9-2.2 mu m, an antireflection film of 2.5-2.8 mu m and an antireflection film of 10-12 mu m; the nonlinear crystal (13) is CdSe crystal or ZnGeP crystal2Crystal, BaGa4Se7A crystal or OP-GaAs crystal; the light transmission surface of the nonlinear crystal (13) is simultaneously plated with an antireflection film of 1.9-2.2 μm, an antireflection film of 2.5-2.8 μm and an antireflection film of 10-12 μm; one surface of the third output mirror (17) is simultaneously plated with a partial reflection film with the reflectivity of 10-90% for 2.5-2.8 μm and a partial reflection film with the reflectivity of 10-90% for 10-12 μm, and the other surface is plated with an anti-reflection film with the reflectivity of 2.5-2.8 μm and an anti-reflection film with the reflectivity of 10-12 μm; one side of the third dichroic mirror (20) is simultaneously plated with a reflection increasing film of 2.5-2.8 μm and a reflection increasing film of 10-12 μm, and the other side is simultaneously plated with a reflection increasing film of 2.5-2.8 μm and a reflection increasing film of 10-12 μm.
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