CN105226491B - Selenium-gallium-barium optical parametric oscillator of 3-micron waveband solid laser pumping - Google Patents
Selenium-gallium-barium optical parametric oscillator of 3-micron waveband solid laser pumping Download PDFInfo
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- CN105226491B CN105226491B CN201510733912.4A CN201510733912A CN105226491B CN 105226491 B CN105226491 B CN 105226491B CN 201510733912 A CN201510733912 A CN 201510733912A CN 105226491 B CN105226491 B CN 105226491B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 40
- 239000007787 solid Substances 0.000 title claims abstract description 30
- 238000005086 pumping Methods 0.000 title claims abstract description 14
- 229910052788 barium Inorganic materials 0.000 title claims abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 25
- 230000010287 polarization Effects 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 4
- 238000002310 reflectometry Methods 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 claims description 2
- 239000011669 selenium Substances 0.000 claims 6
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims 1
- 229910052733 gallium Inorganic materials 0.000 claims 1
- 229910052711 selenium Inorganic materials 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002324 minimally invasive surgery Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000012846 protein folding Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Abstract
The invention relates to a selenium-gallium-barium optical parametric oscillator pumped by a 3-micron waveband solid laser, which comprises a solid laser, an optical isolator, an OPO resonant cavity, a BaGa 4 Se 7 crystal and an optical filter which are used as a pumping source of the optical parametric oscillator, wherein the OPO resonant cavity consists of an input mirror and an output mirror, the optical isolator, the input mirror, the BaGa 4 Se 7 crystal, the output mirror and the optical filter are sequentially arranged along the direction of pumping light output by the solid laser, light passing surfaces of the input mirror, the output mirror and the BaGa 4 Se 7 crystal are parallel to each other, and the light passing surfaces are vertical to output beams of the solid laser.
Description
Technical Field
The invention relates to a selenium-gallium-barium optical parametric oscillator pumped by a 3-micron waveband solid laser, belonging to the technical field of high-energy mid-infrared laser.
Background
The mid-infrared 4-15 micron wave band laser has important application in the fields of biological medicine, spectroscopy, atmospheric detection, photoelectric countermeasure and the like. In the field of biological medical treatment, the light source in the waveband is an important tool for researching protein folding dynamics, biomolecule recognition, high-precision minimally invasive surgery, laser radar detection and the like. Meanwhile, the characteristic absorption spectral line of the laser of the waveband on each gas molecule can be used for trace gas detection, atmosphere detection and medical diagnosis of exhaled gas. However, at present, laser in this band is mainly generated by a free electron laser and a quantum cascade laser, and the wide application of this type of laser is limited by the huge volume or the expensive price of the laser. Mid-infrared laser generated by using an Optical Parametric Oscillator (OPO) is widely used due to its advantages of compact structure, low cost, wide tuning, large output energy, etc. But the defects of easy damage of nonlinear crystals, low conversion efficiency, small output energy, poor beam quality, small wavelength tuning range and the like exist at present.
Disclosure of Invention
The invention solves the problems: the defects of the prior art are overcome, and the selenium-gallium-barium optical parametric oscillator pumped by the 3-micron waveband solid laser is provided to solve the problems of low conversion efficiency, small output energy and the like at present.
The technical scheme includes that the selenium-gallium-barium optical parametric oscillator of a 3-micron waveband solid laser pumping comprises a solid laser serving as an OPO pumping source of the optical parametric oscillator, an optical isolator, an OPO resonant cavity, a BaGa 4 Se 7 crystal and a light filter, wherein the OPO resonant cavity is composed of an input mirror and an output mirror, the optical isolator, the input mirror, the BaGa 4 Se 7 crystal, the output mirror and the light filter are sequentially arranged along the direction of pumping light output by the solid laser, light passing surfaces of the input mirror, the output mirror and the BaGa 4 Se 7 crystal are parallel to each other, all light passing surfaces are perpendicular to output light beams of the solid laser, pumping light output by the solid laser enters the input mirror of the OPO resonant cavity after passing through the optical isolator and then enters the BaGa 4 Se 7 crystal to generate parametric light with two wavelengths, the generated parametric light oscillates in the OPO cavity to amplify energy, the output laser is filtered, and residual pumping light and unnecessary wavelengths of a wave plate are filtered, and the required laser wavelength is reserved.
The solid laser can generate Q-switched laser output of nanosecond pulse, the output wavelength is 2.7-3 micron wave band, the polarization state of the output laser is linear polarization, the pulse width is 10-300ns, and the repetition frequency is 1-100 kHz.
The polarization direction output by the solid laser is perpendicular to the plane formed by the propagation direction of the light beam and the optical axis of the BaGa 4 Se 7 crystal, the included angle between the optical axis of the BaGa 4 Se 7 crystal and the incident light beam is changed by rotating the BaGa 4 Se 7 crystal in the plane, the tuning of the output wavelength can be realized, and the output of the laser with any wavelength in a 4-15 micron waveband can be obtained.
The gain medium of the solid laser adopts an Er-doped gain medium, and comprises Er, YAG, Er, YLF, Er, YSGG, Cr, Er, YSGG and the like.
The end face of the optical isolator is plated with a 3-micron wave band antireflection film.
An input mirror and an output mirror of the OPO resonant cavity are plated with dielectric films, and the input mirror is plated with a 3-micron waveband antireflection film and a 4-15-micron high-reflection film (more than or equal to 99%); the output mirror is coated with a reflecting film with the reflectivity of 1-99 percent at the wave band of 3-15 microns.
The OPO resonant cavity can adopt a single resonance mode of one wavelength resonance or a double resonance mode of two wavelength simultaneous oscillation. The optical parametric conversion can generate laser with two wavelengths, and when the single resonant oscillation is carried out, the output mirror has a certain reflectivity to one wavelength of the generated parametric laser, and the other wavelength is completely transmitted; in dual-resonance oscillation, both of the output mirrors have a certain reflectivity for the generated parametric laser.
The nonlinear crystal adopts a BaGa 4 Se 7 crystal, has high transmittance (more than or equal to 98%) in the range of 1-15 microns and a damage threshold value as high as 557MW/cm 2 (the wavelength of test laser is 1064nm, and the pulse width is 5ns), so that the nonlinear crystal can bear higher laser energy and obtain higher energy output in a long wave.
The solid laser can generate Q-switched laser output of nanosecond pulse, the output wavelength is 2.7-3 micron wave band, the polarization state of the output laser is linear polarization, the pulse width is 10-300ns, and the repetition frequency is 1-100 kHz.
The optical filter is plated with a 3-6 micron wave band 45-degree total reflection film and a 6-15 micron 45-degree antireflection film, and is used for filtering residual pumping light and unnecessary laser wavelength, reserving the required laser wavelength and adjusting the parameters of coating according to actual requirements.
4 7Compared with the prior art, the invention has the advantages that two kinds of laser with different wavelengths can be generated in the optical parametric up-conversion process, the laser with the long wavelength is called idle frequency light, and the laser with the short wavelength is called signal light, the laser output with the long wavelength is more needed by people, theoretically, the closer the laser wavelength of a pumping source and the optical parametric output wavelength is, the higher the conversion efficiency of photon energy is, the invention provides that a solid laser with a 3 micron wave band is adopted as the pumping source, firstly, the conversion efficiency is about 3 times that of the common laser with the wavelength of 1 micron, secondly, the solid laser is directly pumped, the conversion of cascade OPO is avoided, and the higher beam quality is achieved.
Drawings
Fig. 1 is a schematic diagram of a basic structure of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in figure 1, the invention is composed of a 3-micron waveband solid laser 1 of an OPO pump source, an optical isolator 2, an input mirror 3, a BaGa 4 Se 7 crystal 4, an output mirror 5 and a filter 6, wherein the input mirror 3 and the output mirror 5 form a resonant cavity of the OPO, the input mirror 3, the BaGa 4 Se 7 crystal 4 and the output mirror 5 are sequentially arranged along the output laser direction of the pump source laser 1, the light-passing surfaces of the input mirror and the BaGa 4 Se 7 crystal are parallel to each other, and each light-passing surface is vertical to the output light beam of the pump source laser 1.
the pump light output by the pump source laser 1 passes through the optical isolator 2, enters an OPO resonant cavity formed by the input mirror 3 and the output mirror 5, and enters the BaGa 4 Se 7 crystal 4 to generate parametric light with two wavelengths, the polarization direction of the pump light beam is perpendicular to the light beam propagation direction and a plane formed by the BaGa 4 Se 7 crystal optical axis, the output wavelength tuning can be realized by rotating the BaGa 4 Se 7 crystal 4 in the plane to change the included angle between the optical axis and the incident light beam, the laser output with any wavelength in a 4-15 micron waveband can be obtained, the generated parametric light oscillates in the OPO resonant cavity to amplify the energy, the laser is output from the output mirror 5, the residual pump light and the unnecessary wavelength are filtered by the filter 6, and the laser wavelength with the required long wavelength is reserved.
The above examples are provided only for the purpose of describing the present invention, and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims. Various equivalent substitutions and modifications can be made without departing from the spirit and principles of the invention, and are intended to be within the scope of the invention.
Claims (6)
1. A selenium-gallium-barium optical parametric oscillator using a 3 micron wave band solid laser for pumping is characterized by comprising a 3 micron wave band solid laser used as an OPO pumping source of the optical parametric oscillator, an optical isolator, an OPO resonant cavity, a BaGa 4 Se 7 crystal and an optical filter, wherein the OPO resonant cavity is composed of an input mirror and an output mirror;
The solid laser can generate Q-switched laser output of nanosecond pulse, the output wavelength is 2.7-3 micron wave band, the polarization state of the output laser is linear polarization, the pulse width is 10-300ns, and the repetition frequency is 1-100 kHz;
the polarization direction output by the solid laser is vertical to a plane formed by the propagation direction of light beams and the optical axis of the BaGa 4 Se 7 crystal, and the included angle between the optical axis of the BaGa 4 Se 7 crystal and incident light beams is changed by rotating the BaGa 4 Se 7 crystal in the plane, so that the tuning of output wavelength can be realized, and the output of laser with any wavelength in a 4-15 micron waveband can be obtained;
The gain medium of the solid laser adopts an Er-doped gain medium which comprises Er, YAG, Er, YLF, Er, YSGG and Cr, and Er, YSGG.
2. The Se-Ga-Ba optical parametric oscillator pumped by a 3-micron waveband solid laser as claimed in claim 1, wherein: the end face of the optical isolator is plated with a 3-micron wave band antireflection film.
3. The Se-Ga-Ba optical parametric oscillator pumped by a 3-micron waveband solid laser as claimed in claim 1, wherein: an input mirror and an output mirror of the OPO resonant cavity are plated with dielectric films, the input mirror is plated with a 3-micron waveband antireflection film and a 4-15-micron high-reflection film with the thickness of 99 percent or more; the output mirror is coated with a reflecting film with the reflectivity of 1-99% in a wave band of 3-15 microns.
4. The Se-Ga-Ba optical parametric oscillator pumped by a 3-micron waveband solid laser as claimed in claim 1, wherein: the OPO resonant cavity adopts a single resonance mode of one wavelength resonance or a double resonance mode of two wavelength simultaneous oscillation.
5. The Se-Ga-Ba optical parametric oscillator pumped by a 3-micron wave band solid state laser as claimed in claim 1, wherein the BaGa 4 Se 7 crystal has high transmittance in the range of 1-15 microns and a damage threshold of up to 557MW/cm 2, can bear higher laser energy and obtain higher energy output in long wave.
6. The 3-micron band solid laser pumped selenium gallium barium optical parametric oscillator according to claim 1, characterized in that: the optical filter is plated with a total reflection film with a wave band of 3-6 microns and a 45-degree reflection reducing film with a wave band of 6-15 microns.
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| CN105633777A (en) * | 2016-03-03 | 2016-06-01 | 哈尔滨工业大学 | Selenium-gallium-barium optical parameter oscillator for quickly tuning output wavelength |
| CN105552708A (en) * | 2016-03-03 | 2016-05-04 | 哈尔滨工业大学 | Broad band long wave infrared solid laser device based on selenium- gallium- barium crystals |
| JP6966042B2 (en) * | 2016-08-22 | 2021-11-10 | 株式会社オカモトオプティクス | Two-wavelength simultaneous oscillation type infrared optical parametric oscillator |
| CN112234428B (en) * | 2020-11-11 | 2024-09-13 | 长春理工大学 | Three-wavelength double-end comprehensive pumping Cr-Er YSGG acousto-optic Q-switched laser and absorption rate enhancement method |
| CN115144072A (en) * | 2021-03-30 | 2022-10-04 | 中国科学院沈阳自动化研究所 | Mid-infrared light detection system |
| CN113363801B (en) * | 2021-05-22 | 2022-06-24 | 中国科学院理化技术研究所 | High-efficiency medium-far infrared laser device |
| CN115548855B (en) * | 2022-09-22 | 2023-10-20 | 中国人民解放军国防科技大学 | Method and device for generating dual-band middle-far infrared laser based on selenium-gallium-barium crystal |
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| US20100074281A1 (en) * | 2005-05-02 | 2010-03-25 | Bae Systems Information And Electronic Systems Integration Inc. | Thulium Laser Pumped Mid-IR Source With Multi-Spectral Line Output |
| CN101767778B (en) * | 2010-02-03 | 2012-08-15 | 中国科学院理化技术研究所 | BaGa4Se7Compound and BaGa4Se7Nonlinear optical crystal and its preparation method and use |
| CN102709805A (en) * | 2012-03-21 | 2012-10-03 | 清华大学 | Method and device for realizing laser with wavelength greater than 3.7 microns |
| CN203466419U (en) * | 2013-04-11 | 2014-03-05 | 中国科学院合肥物质科学研究院 | Medical 2.79-micro m electro-optic Q-switched Cr, Er:YSGG laser |
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| ZnGeP2 optical parametric oscillator with 3.8-12.4um tunability;K.L.Vodopyanov等;《OPTICS LETTERS》;20000601;第25卷(第11期);正文第1-3栏及图1-2 * |
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