CN115000790A - Pulse middle and far infrared laser optical parametric oscillator with low pumping threshold and high conversion efficiency - Google Patents
Pulse middle and far infrared laser optical parametric oscillator with low pumping threshold and high conversion efficiency Download PDFInfo
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- 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
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- 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
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Abstract
The invention provides a pulse mid-infrared laser optical parametric oscillator with low pumping threshold and high conversion efficiency, which comprises: the laser comprises a laser pumping source, an optical parametric resonant cavity, a plurality of parametric crystals, a frequency doubling crystal and a plurality of reflectors; the optical parameter resonant cavity comprises a double-loop resonant cavity consisting of a first loop resonant light path and a second loop resonant light path; each reflector and the optical axis of the resonant optical path form a preset included angle; a first return-word resonant light path and a second return-word resonant light path of the optical parameter resonant cavity are formed; laser of a laser pumping source is injected into the first square-shaped resonant light path and the second square-shaped resonant light path through the first reflecting mirror M1, and the frequency doubling crystal is placed between the second reflecting mirror M2 and the third reflecting mirror M3; or between the fifth mirror M5 and the sixth mirror M6; the parametric crystals are placed between the first mirror M1 and the second mirror M2 and between the third mirror M3 and the fourth mirror M4; the fourth mirror M4 is an idler output mirror.
Description
Technical Field
The invention belongs to the technical field of nonlinear laser crystals, and particularly relates to a pulse mid-infrared laser optical parametric oscillator with a low pumping threshold and high conversion efficiency.
Background
Currently, mid-far infrared lasers have wide and important applications in the fields of photoelectric countermeasure, environmental monitoring, medicine, molecular spectroscopy and the like. The Optical Parametric Oscillator (OPO) can convert mature 1 μm laser into middle and far infrared laser, and has the advantages of full curing, miniaturization, adjustable output wavelength and wide waveband, simple structure, etc.
However, in the pulse laser pumped OPO, the low pumping threshold and the high pumping conversion efficiency are a pair of contradictions, and under the condition that the reflectivity of the OPO cavity mirror to the signal light is high, when the pumping energy is low, the signal light in the cavity can also oscillate and enhance to be near the threshold energy, so the pumping threshold is low; when the pumping energy is high, the power density of the signal light in the cavity is too high, and at the moment, the signal light can be reversely converted to the pumping light, and the conversion efficiency of the pumping light can be seriously influenced in the reverse conversion process, so that the pumping conversion efficiency is low. Under the condition that the reflectivity of the OPO cavity mirror to the signal light is low, when the pumping energy is low, the signal light in the cavity is difficult to oscillate and enhance to be close to the threshold energy, so that the pumping threshold is high; when the pumping energy is higher, the power density of the signal light in the cavity is not too high because the reflectivity of the cavity mirror is lower, and the reverse conversion degree is smaller at the moment, so the pumping conversion efficiency is higher.
In addition, there are also situations where the degree of inverse transformation is not uniform in space and time within the same OPO cavity. The pulse pump laser generally follows Gaussian distribution in space and time, and pump light energy is stronger and the inverse conversion degree is higher at a pulse time center and a light spot center; at the pulse starting section, the pulse ending section and the light spot edge, the energy of the pump light is weaker, and the reverse conversion degree is lower; imbalance in the degree of inverse conversion in the OPO cavity is also an important reason for the contradiction between low threshold and high conversion efficiency.
The most common technical means for reducing the threshold is to improve the reflectivity of the OPO cavity mirror to the signal light. In 2002, Zhang Bangjin et al obtained mid-infrared laser output with low pumping threshold using OPO cavity mirrors with high reflectivity for signal light. Under the condition that the output of the 1.06 mu m laser pumping PPLN is 2.12 mu m, when the reflectivities of the front and rear cavity mirrors for the signal light are 99.8% and 99.2%, respectively, the pumping threshold is only 1.5mW, but the output energy of the middle infrared laser is smaller. When the pump energy is 4 times the threshold power, the conversion efficiency is 15%. It is mentioned that if the transmission rate of the OPO cavity mirror to the signal light is improved, the middle infrared laser output with higher power can be obtained under the same design condition.
The most common technical means for improving the pump conversion efficiency is to reduce the reflectivity of the OPO cavity mirror to the signal light. In 2017, Wang L et al obtained high conversion efficiency mid-infrared laser output using an OPO cavity mirror with low reflectivity for signal light. When the 2.09-micron laser pump ZGP outputs 3.6-4.8-micron laser, the conversion efficiency is up to 75.7% when the reflectivities of the front and rear cavity mirrors for the signal light are respectively high reflection and 50%.
In addition to the OPO cavity mirror reflectivity, which affects the pump threshold and pump conversion efficiency, the absorption of parametric light by the nonlinear crystal also affects the threshold and conversion efficiency. Use 1.06um pumping KTP and KTA output human eye safe wave band laser (1.6um) as an example, parameter light (3.2um) is at the oscillation of OPO intracavity this moment, because KTP will be higher than KTA at the absorption of 3.2um wave band, and parameter light loss is great when the intracavity oscillates, therefore the pumping threshold value of KTP OPO will be higher than KTA OPO under same design condition, but conversion efficiency is higher than KTA OPO. In 2015, Li H et al output 1.57um laser with 1.06um laser pump KTA OPO, and conversion efficiency was about 26%. Under similar conditions, in 2018, m.kaskow et al output 1.57um laser with 1.06um laser ben pu KTP OPO, and the conversion efficiency is about 51%.
Researchers have also explored other methods of improving pump conversion efficiency, such as using parametric crystals to double frequency pump light and signal light to consume signal light, dual wavelength laser pumped parametric crystals, and the like.
In 2015, people in Jiang Tao et al utilized the sum frequency of the pumping light (1300 and 1500nm) and the pumping light (1064nm) to generate red-orange light, thereby obtaining visible light and reducing the intensity of the signal light in the cavity.
In 2021, Wang P et al injected 1060nm and 1120nm fiber lasers into PPLN, 1060nm laser pumped PPLN generated signal light (1627nm) and idler light (3042nm), and 1120nm pump light was then differed from signal light (1627nm) to generate idler light of 3593nm, which consumed a portion of signal light in the cavity, suppressed the reverse conversion, and simultaneously output mid-infrared laser light of two wavelengths (3042nm, 3593 nm).
One of the prior art schemes is shown in fig. 1, which utilizes sum frequency of pumping generated signal light (1300-1500nm) and pumping light (1064nm) to generate red-orange light.
As shown in FIG. 1, pump light of 1064nm is generated between the M1-M3 mirrors, OPO is generated between M3-M4, and mid-infrared laser light and red orange light are generated. Wherein, the M3 mirror is highly transparent to 1064nm laser and highly reflective to 1300-1500nm signal light, 580-650nm red orange light and 2.5-4.5 μ M idler frequency light. M4 is highly transparent to 2.5-4.5 μ M idler light and 580-1500 nm red orange light, and highly reflective to 1300-1500nm signal light.
The wavelengths of the signal light and the idler frequency light are changed by adjusting the temperature of the PPLN crystal, and red orange light with different wavelengths is obtained.
Scheme two in the prior art: a double wavelength pumped PPLN crystal. As shown in FIG. 2, the M1 and M2 mirrors are highly transparent to pump light (1-1.2 μ M) and idler light (3-4 μ M) and highly reflective to signal light (1.4-1.7 μ M). The PPLN is pumped by the pump light 1060nm laser, signal light of 1627nm and idler frequency light of 3042nm are output, and idler frequency light of 3593nm is generated by difference frequency of the pump light 1120nm laser and the generated 1627nm signal light.
The 1060nm laser energy is fixed, and the mid-infrared laser output with high conversion efficiency is obtained by adjusting the input 1120nm laser energy.
The first scheme has the disadvantage that the PPLN crystal serves as an optical parametric oscillation crystal to convert pump light into signal light and idler frequency light, and serves as a sum frequency crystal to convert the signal light and the pump light into red orange light, so that compatibility with both an optical parametric oscillation process and a sum frequency process is difficult to achieve in phase matching, and conversion efficiency is limited.
The second solution has the disadvantage that two pump lights are required to operate simultaneously, increasing the complexity of the system.
Disclosure of Invention
In order to solve the technical problem, the invention provides a pulse mid-infrared laser optical parametric oscillator with low pumping threshold and high conversion efficiency, which is characterized by comprising a laser pumping source, an optical parametric resonant cavity, a plurality of parametric crystals, a frequency doubling crystal and a plurality of reflectors;
the optical parametric resonant cavity comprises a double-loop resonant cavity consisting of a first loop resonant light path and a second loop resonant light path;
the plurality of mirrors includes a first mirror M1, a second mirror M2, a third mirror M3, a fourth mirror M4, a fifth mirror M5, and a sixth mirror M6; each reflector and an optical axis passing through the double-return-shaped resonant cavity light path form a preset included angle; (ii) a
The first reflector M1, the second reflector M2, the third reflector M3 and the fourth reflector M4 form a first rectangular resonant light path of the optical parametric resonant cavity;
the first reflector M1, the fifth reflector M5, the sixth reflector M6 and the fourth reflector M4 form a second return-to-square resonant light path of the optical parametric resonator;
the fifth reflector M5 is positioned on the optical axis extension line outside the second reflector M2, and the sixth reflector M6 is positioned on the optical axis extension line outside the third reflector M3;
laser of the laser pumping source is injected into the first square-shaped resonant optical path and the second square-shaped resonant optical path through the first reflector M1, and is reflected by the second reflector M2, the third reflector M3 and the fourth reflector M4, and then is transmitted out of the first square-shaped resonant optical path through the first reflector M1;
meanwhile, laser is injected into a second zigzag resonant optical path through the first reflector M1, and is reflected by a fifth reflector M5, a sixth reflector M6 and a fourth reflector M4, and then is transmitted out of the first zigzag resonant optical path through the first reflector M1;
the frequency doubling crystal is placed between the second mirror M2 and a third mirror M3; or the frequency doubling crystal is placed between the fifth mirror M5 and a sixth mirror M6;
while placing the parametric crystal between the first M1 and second M2 mirrors and between the third M3 and fourth M4 mirrors;
the fourth mirror M4 is an idler output mirror that outputs an idler.
Further, the frequency doubling crystal is an LBO crystal; the parametric crystal is a BGSe crystal or a KTA crystal.
Further, the laser of the laser pump source is Nd: YAG pulse laser, the pulse width of the laser is ns level; the laser spot radius is more than or equal to 2 mm.
Further, when the frequency doubling crystal is placed between the second mirror M2 and the third mirror M3, the third mirror M3 serves as an output mirror for frequency-doubled light of the output signal light;
when the frequency doubling crystal is placed between the fifth mirror M5 and the sixth mirror M6, the sixth mirror M6 serves as an output mirror for frequency doubled light of the output signal light.
Furthermore, two optical surfaces of the frequency doubling crystal are plated with an antireflection film for the signal light and an antireflection film for the frequency doubling light.
Further, the reflective film and the transmissive film of each mirror are selected from:
the laser transmittance T of the first reflector M1 to the laser pumping source is more than 95%, and the signal light reflectance R is more than 99%;
the fourth reflector M4 has a transmittance T of more than 95% for idler frequency light and frequency doubling light; and the reflectivity R of laser of the laser pumping source and the signal light is more than 99 percent.
Further, the reflective film and the transmissive film of each mirror are selected from:
when the frequency doubling crystal is placed between the second mirror M2 and the third mirror M3, the second mirror M2 has a pumping and idler light transmittance T > 95% and a signal light reflectance R > 99% from 1.14-1.65 μ M;
the frequency doubling light transmittance T of the third reflector M3 to the pump light, the idler light and the signal light is more than 95%; the reflectivity R of the signal light is more than 99 percent;
the fifth reflector M5 has a reflectivity R > 99% for pump and idler light;
the sixth mirror M6 has a reflectivity R > 99% for pump and idler light.
Further, the reflective film and the transmissive film of each mirror are selected from:
when the frequency doubling crystal is placed between the fifth mirror M5 and sixth mirror M6,
the second mirror M2 has a reflectivity R for pump and idler light of > 99%, and a transmissivity T for signal light of > 95%;
the reflectivity R of the third reflector M3 to pump light and idler frequency light is more than 99%, and the transmissivity T to signal light is more than 95%;
the fifth reflector M5 has a reflectivity R > 99% for the signal light;
the sixth reflector M6 has a reflectivity R > 99% for the signal light; and the frequency doubling light transmittance T of the signal light is more than 95 percent.
Further, the high reflectivity or high transmissivity of the reflector is provided by a mirror surface coating of the reflector.
Further, the preset included angle between each reflector and the optical axis passing through the double-return-shaped resonant cavity optical path is 45 degrees.
The method for generating the pulse middle and far infrared laser with low threshold and high conversion efficiency can obtain low pumping threshold, can inhibit the reverse conversion of the pulse pumping light in time and space, and provides an effective method for improving the conversion efficiency of the middle and far infrared laser.
Drawings
FIG. 1 shows a signal light 1300-1500nm generated by pumping and a pump light and frequency generated red-orange light in the prior art.
Fig. 2 is a prior art dual wavelength pumped PPLN crystal.
FIG. 3 is a schematic diagram of an optical parametric oscillator with a double-loop resonator according to the present invention.
Fig. 4 is a structural diagram of an optical parametric oscillator with a double-loop resonator according to a first embodiment of the present invention.
Fig. 5 is a structural diagram of an optical parametric oscillator with a double-square cavity resonator according to a second embodiment of the present invention.
Fig. 6 is a structural view of an optical parametric oscillator having a double-loop cavity resonator according to a third embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The invention provides a pulse mid-infrared laser optical parametric oscillator with low pumping threshold and high conversion efficiency, which is characterized by comprising a laser pumping source, an optical parametric resonant cavity, a plurality of parametric crystals, a frequency doubling crystal and a plurality of reflectors, wherein the laser pumping source is arranged in the optical parametric resonant cavity;
the optical parametric resonant cavity comprises a double-loop resonant cavity consisting of a first loop resonant light path and a second loop resonant light path;
the plurality of mirrors includes a first mirror M1, a second mirror M2, a third mirror M3, a fourth mirror M4, a fifth mirror M5, and a sixth mirror M6; each reflector forms a preset included angle with an optical axis passing through the double-return-shaped resonant cavity optical path;
the first reflector M1, the second reflector M2, the third reflector M3 and the fourth reflector M4 form a first rectangular resonant light path of the optical parametric resonant cavity;
the first reflector M1, the fifth reflector M5, the sixth reflector M6 and the fourth reflector M4 form a second return-word type resonant light path of the optical parametric resonant cavity;
the fifth reflector M5 is positioned on the optical axis extension line outside the second reflector M2, and the sixth reflector M6 is positioned on the optical axis extension line outside the third reflector M3;
laser of the laser pumping source is injected into a first zigzag resonant optical path and a second zigzag resonant optical path through the first reflector M1, and is reflected by the second reflector M2, the third reflector M3 and the fourth reflector M4 and then is transmitted out of the first zigzag resonant optical path through the first reflector M1;
meanwhile, laser is injected into a second zigzag resonant optical path through the first reflector M1, and is reflected by a fifth reflector M5, a sixth reflector M6 and a fourth reflector M4, and then is transmitted out of the first zigzag resonant optical path through the first reflector M1;
the frequency doubling crystal is placed between the second mirror M2 and a third mirror M3; or the frequency doubling crystal is placed between the fifth mirror M5 and a sixth mirror M6;
while placing the parametric crystal between the first and second mirrors M1 and M2 and between the third and fourth mirrors M3 and M4;
the fourth mirror M4 is an idler output mirror that outputs idler.
The invention adopts a mode of inserting frequency doubling crystals in a double-square-shaped cavity to obtain the pulse middle and far infrared laser with low pumping threshold and high conversion efficiency. The pumping light and the idler frequency light pass through the first zigzag resonant optical path in a single time, the signal light oscillates in the second zigzag resonant optical path, the first zigzag resonant optical path is provided with a nonlinear crystal for converting the pumping light into the signal light and the idler frequency light, and the second zigzag resonant optical path is provided with a frequency doubling crystal for frequency doubling of the signal light. When the pumping energy is low, the consumption of the signal light in the frequency doubling crystal is low, the oscillation can be started quickly, and the pumping threshold is low; when the power density of the signal light is high, a part of the signal light is converted into visible light in a frequency doubling mode, and the other part of the signal light continuously oscillates between the second square-shaped resonant light paths. The method inhibits reverse conversion, improves the pumping conversion efficiency, and can judge the intensity of the signal light in the OPO cavity by observing the intensity of the output visible light.
Further, the frequency doubling crystal is an LBO crystal; the parametric crystal is a BGSe crystal or a KTA crystal.
Further, the laser of the laser pump source is Nd: YAG pulse laser, the pulse width of the laser is ns level; the radius of the laser spot is more than or equal to 2 mm.
As shown in fig. 3, M1, M2, M3, and M4 form a first loop-shaped resonant optical path, and M1, M5, M6, and M4 form a second loop-shaped resonant optical path. Nd: YAG outputs 1.06 μ M pulse laser with pulse width of several nanoseconds to tens of nanoseconds, M1 mirror has high transmittance to pump light of 1064nm and high reflectance to signal light of 1.14-1.65 μ M; the M2 and M3 mirrors have high reflectivity to pump light 1064nm and idler frequency light 3-17 μ M, and high transparency to signal light 1.14-1.65 μ M; the M4 mirror is highly reflective to pump light 1064nm, signal light 1.14-1.65 μ M, and highly transparent to idler frequency light 3-17 μ M; the M5 mirror has high reflection to signal light of 1.14-1.65 μ M; the M6 mirror has high reflection for signal light of 1.14-1.65 μ M and high transmission for frequency doubling light of 570-825 nm. The ginseng crystal is plated with an antireflection film, and has high transmittance for pump light 1064nm, signal light 1.14-1.65 μm and idler frequency light 3-17 μm. The frequency doubling crystal is plated with an antireflection film, and the film has high transmittance to signal light with the wavelength of 1.14-1.65 mu m and frequency doubling visible light of 570-825 nm.
At the edges of the initial segment, the final segment and the pumping spot space of the pumping pulse time, pumping light 1064nm passes through the parametric crystal to generate a small amount of signal light of 1.14-1.65 μ M and idler frequency light of 3-17 μ M, the signal light is weaker at the moment and is enhanced by oscillation among the M1, the parametric crystal, the M5, the frequency doubling crystal, the M6 mirror, the parametric crystal, the M4 and the M1, the frequency doubling efficiency is not high at the moment, and the signal light starts oscillation normally; the pumping light is output through the M1 mirror; the idler is output through the M4 mirror.
At the center of the pumping pulse time and the center of the pumping spot space, a large amount of signal light 1.14-1.65 μ M and idler frequency light 3-17 μ M are generated after pump light 1064nm passes through the parametric crystal, at the moment, the signal light is stronger, after the signal light passes through the frequency doubling crystal, a part of the signal light is frequency doubled to generate visible light 570-plus 825nm, the visible light is output through the M6 mirror, and the other part of the signal light is reflected by the M6 mirror and continues to oscillate among the M1, the M5, the M6 and the M4 mirror. The pumping light is output through the M1 mirror; the idler frequency light is output through an M4 mirror; the signal light intensity in the cavity is suppressed, so that the conversion efficiency of the pump light to the idler frequency light is increased.
Claims (10)
1. A pulse mid-infrared laser optical parametric oscillator with low pumping threshold and high conversion efficiency is characterized in that the optical parametric oscillator comprises a laser pumping source, an optical parametric resonant cavity, a plurality of parametric crystals, a frequency doubling crystal and a plurality of reflectors;
the optical parametric resonant cavity comprises a double-loop resonant cavity light path consisting of a first loop resonant light path and a second loop resonant light path;
the plurality of mirrors includes a first mirror (M1), a second mirror (M2), a third mirror (M3), a fourth mirror (M4), a fifth mirror (M5), and a sixth mirror (M6); each reflector and an optical axis passing through the double-return-shaped resonant cavity light path form a preset included angle;
the first reflector (M1), the second reflector (M2), the third reflector (M3) and the fourth reflector (M4) form the first rectangular resonant optical path of the optical parametric resonator;
the first reflector (M1), the fifth reflector (M5), the sixth reflector (M6) and the fourth reflector (M4) form the second square-shaped resonant optical path of the optical parametric resonator;
the fifth mirror (M5) is located on an optical axis extension outside the second mirror (M2), and the sixth mirror (M6) is located on an optical axis extension outside the third mirror (M3);
laser of the laser pumping source is injected into the first rectangular-square resonant optical path and the second rectangular-square resonant optical path through the first reflector (M1), and is transmitted out of the first rectangular-square resonant optical path by the first reflector (M1) after being reflected by the second reflector (M2), the third reflector (M3) and the fourth reflector (M4);
meanwhile, the laser is injected into the second zigzag resonant optical path through the first reflector (M1), and is transmitted out of the first zigzag resonant optical path by the first reflector (M1) after being reflected by the fifth reflector (M5), the sixth reflector (M6) and the fourth reflector (M4);
the frequency doubling crystal is placed between the second mirror (M2) and the third mirror (M3); or the frequency doubling crystal is placed between the fifth mirror (M5) and the sixth mirror (M6);
simultaneously placing the parametric crystal between the first mirror (M1) and the second mirror (M2) and between the third mirror (M3) and the fourth mirror (M4);
the fourth mirror (M4) is an idler output mirror that outputs idler.
2. The optical parametric oscillator of claim 1, wherein the frequency doubling crystal is an LBO crystal; the parametric crystal is a BGSe crystal or a KTA crystal.
3. An optical parametric oscillator according to claim 2, wherein the laser of the laser pump source is Nd: YAG pulse laser, the pulse width of the laser is ns level; the laser spot radius is more than or equal to 2 mm.
4. The optical parametric oscillator of claim 1, wherein when the frequency doubling crystal is placed between the second mirror (M2) and the third mirror (M3), the third mirror (M3) acts as a frequency doubling light output mirror for frequency doubled light of the output signal light;
when the frequency doubling crystal is placed between the fifth mirror (M5) and the sixth mirror (M6), the sixth mirror (M6) serves as a frequency doubling light output mirror that outputs frequency doubled light of signal light.
5. The optical parametric oscillator of claim 4, wherein both optical faces of the frequency doubling crystal are coated with an anti-reflection coating for the signal light and an anti-reflection coating for the frequency doubling light.
6. An optical parametric oscillator according to claim 1, wherein the reflective and transmissive films of each mirror are selected from:
the laser transmittance T of the first reflector (M1) to the laser pumping source is more than 95%, and the signal light reflectance R is more than 99%;
the fourth mirror (M4) has a transmittance T > 95% for the idler light and the frequency doubled light; the reflectivity R of laser of the laser pumping source and the signal light is more than 99%.
7. An optical parametric oscillator according to claim 6, wherein the reflective and transmissive films of each mirror are selected from:
when the frequency doubling crystal is placed between the second mirror (M2) and the third mirror (M3):
the second mirror (M2) has a transmission T > 95% for pump light and the idler light and a reflection R > 99% for the signal light;
the third reflector (M3) has a frequency doubling light transmittance T of more than 95% for the pump light, the idler light and the signal light; -a reflectivity R > 99% for said signal light;
the fifth mirror (M5) has a reflectivity R > 99% for the pump light and the idler light;
the sixth mirror (M6) has a reflectivity R > 99% for the pump and idler.
8. An optical parametric oscillator according to claim 6, wherein the reflective and transmissive films of each mirror are selected from:
when the frequency doubling crystal is placed between the fifth mirror (M5) and the sixth mirror (M6):
the second mirror (M2) has a reflectivity R > 99% for pump light and the idler light and a transmissivity T > 95% for the signal light;
the third reflector (M3) has a reflectivity R > 99% for the pump light and the idler light and a transmissivity T > 95% for the signal light;
the fifth mirror (M5) has a reflectivity R > 99% for the signal light;
the sixth mirror (M6) has a reflectivity R > 99% for the signal light; and the frequency doubling light transmittance T of the signal light is more than 95 percent.
9. An optical parametric oscillator according to any of claims 6 to 8, wherein the high reflectivity or high transmissivity of the mirror is provided by a mirror coating of the mirror.
10. An optical parametric oscillator according to claim 1, wherein the predetermined angle between each mirror and the optical axis through the beam path of the double-return resonator is 45 degrees.
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| CN202210630949.4A CN115000790B (en) | 2022-06-06 | 2022-06-06 | Pulse middle-far infrared laser optical parametric oscillator with low pumping threshold and high conversion efficiency |
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| US5406408A (en) * | 1993-02-26 | 1995-04-11 | Cornell Research Foundation, Inc. | Intracavity-doubled tunable optical parametric oscillator |
| WO1998001927A1 (en) * | 1996-07-04 | 1998-01-15 | The Secretary Of State For Defence | Optical parametric oscillator |
| US20050163187A1 (en) * | 2003-10-09 | 2005-07-28 | Spinelli Luis A. | Intracavity frequency-tripled CW laser with traveling-wave ring-resonator |
| CN102751653A (en) * | 2012-07-19 | 2012-10-24 | 厦门大学 | Photonic crystal fiber based medium-infrared optical fiber parametric oscillator for degenerating four-wave mixing |
| CN110556699A (en) * | 2019-09-16 | 2019-12-10 | 西安电子科技大学 | High-energy high-light beam quality tunable optical parametric oscillator pumped by nanosecond laser |
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| US5406408A (en) * | 1993-02-26 | 1995-04-11 | Cornell Research Foundation, Inc. | Intracavity-doubled tunable optical parametric oscillator |
| WO1998001927A1 (en) * | 1996-07-04 | 1998-01-15 | The Secretary Of State For Defence | Optical parametric oscillator |
| US20050163187A1 (en) * | 2003-10-09 | 2005-07-28 | Spinelli Luis A. | Intracavity frequency-tripled CW laser with traveling-wave ring-resonator |
| CN102751653A (en) * | 2012-07-19 | 2012-10-24 | 厦门大学 | Photonic crystal fiber based medium-infrared optical fiber parametric oscillator for degenerating four-wave mixing |
| CN110556699A (en) * | 2019-09-16 | 2019-12-10 | 西安电子科技大学 | High-energy high-light beam quality tunable optical parametric oscillator pumped by nanosecond laser |
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