CN211700916U - Long-wave infrared Raman laser - Google Patents
Long-wave infrared Raman laser Download PDFInfo
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- CN211700916U CN211700916U CN202020268832.2U CN202020268832U CN211700916U CN 211700916 U CN211700916 U CN 211700916U CN 202020268832 U CN202020268832 U CN 202020268832U CN 211700916 U CN211700916 U CN 211700916U
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Abstract
The utility model discloses an infrared raman laser of long wave, the laser includes: the system comprises a tunable optical parametric oscillator, a laser processing unit and a laser processing unit, wherein the tunable optical parametric oscillator emits linear polarized pump light with the wavelength ranging from 3.8 to 4.7 mu m, the pump light enters an isolator after passing through a telescope beam shaping device, and enters a diamond Raman oscillator through a focusing lens; the diamond Raman oscillator generates first-order Stokes light with the wavelength of 8-12 mu m through stimulated Raman scattering, and amplification and output of the Stokes light are achieved. The utility model provides a realize the new technological means of far infrared high power laser output to the efficiency and the output of far infrared high power laser have been improved.
Description
Technical Field
The utility model relates to a laser instrument field especially relates to an infrared raman laser of long wave.
Background
The wave band more than 8 μm is a window of atmosphere, belongs to the long-wave far-infrared range, is the peak wavelength of black body or gray body radiation under the normal temperature condition, is the wavelength corresponding range of infrared focal plane detectors such as HgCdTe or GaAs/AlGaAs quantum well, has stronger penetrating power to fog, smoke dust and the like, and is also the fundamental frequency absorption band of some toxic gas and biological warfare agent molecules, so the wavelength laser has important application value in the fields of infrared photoelectric countermeasure, differential radar, laser active imaging radar and the like. Due to conventional CO2The gas laser cannot completely cover the 8-12 μm area, and blanks exist in the wave bands of 8-9 μm and 11-12 μm. From the application of the laser, the solid laser has the advantages of compact structure, high stability, good reliability, portability and the like. Therefore, the development of a solid laser with a wavelength band of 8-12 μm is one of the development directions of solid lasers.
The nonlinear optical conversion can obtain the far infrared band laser, but is limited by the heat load capacity of the traditional nonlinear crystal and the current technical level, the conversion efficiency is low, the output power of the far infrared laser is low, and the beam quality is difficult to ensure.
SUMMERY OF THE UTILITY MODEL
The utility model provides an infrared raman laser of long wave, the utility model provides a realize the new technology means of far infrared high power laser output to improved the conversion efficiency and the output of far infrared laser, see the following description for details:
a long-wave infrared raman laser, the laser comprising: a tunable optical parametric oscillator having a tunable optical parametric oscillator,
the tunable optical parametric oscillator emits linear polarized pump light with the wavelength ranging from 3.8 to 4.7 microns, the pump light enters the isolator after passing through the telescope beam shaping device and enters the diamond Raman oscillator through the focusing lens;
the diamond Raman oscillator generates first-order Stokes light with the wavelength of 8-12 mu m through stimulated Raman scattering.
Further, the optical isolator is used for unidirectional transmission of pump light. The telescope beam shaping device consists of two convex lenses, and the light transmitting surfaces of the two convex lenses are both plated with a broadband dielectric film for increasing the transmission of pump light, so that the collimation and the size adjustment of the beam are realized.
Wherein, the diamond Raman oscillator is composed of an input mirror, a diamond crystal and an output mirror. The input mirror is a flat-concave mirror, the plane is plated with a broadband dielectric film for increasing the transmission of the pump light, and the concave surface is plated with a broadband dielectric film for increasing the transmission of the pump light and highly reflecting the Stokes light. The cutting angle theta of the diamond crystal is 67.2 degrees, and both ends of the diamond crystal are not coated with films, or are coated with broadband dielectric films for increasing the transmission of Stokes light, or are coated with broadband dielectric films for increasing the transmission of pumping light and Stokes light at the same time. The output mirror is a flat-concave mirror, the concave surface of the output mirror is plated with a broadband dielectric film which is partially transmitted to Stokes light, and the plane of the output mirror is plated with a broadband dielectric film which is highly transmitted to Stokes light.
Further, the laser further includes: and the optical filter is a band-pass optical filter or a long-pass optical filter and is used for absorbing residual pump light.
The utility model provides a technical scheme's beneficial effect is:
1. the laser firstly proposes that a 3.8-4.7 mu m mid-infrared tunable optical parametric oscillator is used as a pumping source to pump a diamond Raman oscillator, and long-wave infrared laser output with the wavelength of 8-12 mu m is obtained;
2. the diamond Raman oscillator adopts diamond cut by a Brewster angle as a Raman gain medium, and because the refractive index of the diamond at the angle of >3 mu m is almost constant (n is 2.378 +/-0.001), the diamond is used for cutting the Brewster angle (theta is 67.2 degrees), and linear polarization oscillation can be effectively realized for both pumping light and Stokes light; in addition, the problems of low Raman gain coefficient, narrow spectrum transmission range and poor performance of the traditional material can be effectively solved by using diamond as a Raman gain medium, so that high-power long-wave infrared laser output is realized;
3. the diamond Raman oscillator is simple and compact in structure, can realize miniaturization, is applied to industrial and military equipment, and has important application value in the fields of infrared photoelectric countermeasure, differential radar, laser active imaging radar and the like.
Drawings
Fig. 1 is a schematic structural diagram of a long-wave infrared raman laser.
In the drawings, the components represented by the respective reference numerals are listed below:
1: a tunable optical parametric oscillator; 2: a telescope beam shaping device;
3: an optical isolator; 4: a focusing lens;
5: a diamond Raman oscillator; 6: and (3) a filter.
Wherein the content of the first and second substances,
5-1: an input mirror; 5-2: diamond crystals; 5-3: and an output mirror.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below.
The stimulated Raman scattering does not need phase matching, has a light beam purification effect, has the advantages of compact structure, coverage of special wavelength and the like, and is widely applied to the fields of traffic, information, medical treatment, industry and agriculture, national defense and the like. Compared with a gas or liquid Raman laser, the solid Raman laser has the advantages of small volume, good mechanical property, no toxicity and the like. As the most important component of a solid-state raman laser, a raman crystal has become a research hotspot of the raman laser. Diamond as an excellent raman crystal has a very high raman gain coefficient, a very high raman shift and a very wide spectral transmission range (completely covering a long-wave infrared band), and also has a very low thermal expansion coefficient and a very high thermal conductivity, so that a diamond raman laser becomes an emerging technical means of high power and wavelength conversion raman laser output without heat influence. In addition, the spatial and phase characteristics of the Stokes light generated in the raman process are not influenced by the characteristics of the pump light beam, so the diamond raman laser can effectively improve the spatial coherence of the input light beam.
In order to obtain far infrared high power laser, the utility model provides an optical parametric oscillator based on mid-infrared band has realized the output of 3.8 ~ 4.7 mu m narrow linewidth laser and uses it for pumping diamond raman laser through adjusting crystal angle in the optical parametric oscillator as the pumping source, has finally obtained the Stokes light that the wavelength is 8 ~ 12 mu m scope.
Referring to fig. 1, the long-wave infrared raman laser includes: the device comprises a tunable optical parametric oscillator 1, a telescope beam shaping device 2, an optical isolator 3, a focusing lens 4, a diamond Raman oscillator 5 and an optical filter 6. Wherein, the diamond Raman oscillator 5 consists of an input mirror 5-1, a diamond crystal 5-2 and an output mirror 5-3.
The tunable optical parametric oscillator 1 operates continuously, quasi-continuously or in a pulse mode, emits linearly polarized pump light with the wavelength of 3.8-4.7 microns, the pump light enters the isolator 3 after being adjusted and collimated by the beam aperture of the telescope light shaping device 2, then enters the diamond Raman oscillator 5 through the focusing lens 4, first-order Stokes light with the wavelength of 8-12 microns is generated through stimulated Raman scattering, and amplification and output of the Stokes light are achieved at the diamond Raman oscillator 5.
Wherein, the beam aperture adjustment and collimation of telescope light shaping device 2 are known to those skilled in the art, and the embodiment of the present invention is not repeated here.
The optical isolator 3 is used for protecting the tunable optical parametric oscillator 1, so that pump light can only pass through in a single direction, and light transmitted in a reverse direction cannot enter the tunable optical parametric oscillator 1 through the optical isolator 3; the telescope beam shaping device 2 consists of two convex lenses, and the light transmission surfaces of the two convex lenses are both coated with a broadband dielectric film for increasing the transmission of pump light, and are used for realizing the collimation of light beams and the adjustment of the size of the light beams.
An input mirror 5-1 of the diamond Raman oscillator 5 is a flat-concave mirror, a broadband dielectric film which is anti-reflection to the pumping light is plated on the flat surface, a broadband dielectric film which is anti-reflection to the pumping light and highly reflective to Stokes light is plated on the concave surface, and the pumping light emitted from the tunable optical parametric oscillator 1 enters the diamond Raman oscillator 5 through the input mirror 5-1.
The cutting angle theta of two ends of the diamond crystal 5-2 is 67.2 degrees, and two ends of the diamond crystal 5-2 can be uncoated, or coated with a broadband dielectric film for increasing the reflectivity of Stokes light, or coated with a broadband dielectric film for increasing the reflectivity of pumping light and Stokes light simultaneously.
The output mirror 5-3 is a flat-concave mirror, the concave surface of which is plated with a broadband dielectric film which is partially transparent to the Stokes light, and the plane of which is plated with a broadband dielectric film which is highly transparent to the Stokes light.
The high-reflection broadband dielectric film for the pump light can also be selectively plated, for example: when the concave surface is plated with a broadband dielectric film which is highly reflective to the pump light, the pump light is bi-pass pumped; when the broadband dielectric film which is highly reflective to the pump light is not plated, the pump light is a single-pass pump.
The optical filter 6 is a band-pass filter or a long-pass filter, and is used for absorbing residual pump light, and pure laser output with different specific wavelengths or wavelength ranges within a wavelength range of 8-12 μm can be realized by selecting different transmission spectral ranges.
To sum up, the utility model discloses at first propose the laser of 3.8 ~ 4.7 mu m that adopts optical parametric oscillator as the pumping source to regard as the raman gain medium with the diamond crystal that has high gain coefficient and high thermal conductivity, pass through diamond raman oscillator with the pump light that the wavelength is 3.8 ~ 4.7 mu m and obtain 8 ~ 12 mu m's Stokes light laser output, realize wavelength adjustable all-solid-state long wave infrared laser.
The embodiment of the utility model provides a except that doing special explanation to the model of each device, the restriction is not done to the model of other devices, as long as can accomplish the device of above-mentioned function all can.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, and the embodiments of the present invention are given the same reference numerals and are not intended to represent the merits of the embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. A long-wave infrared raman laser, comprising: a tunable optical parametric oscillator having a tunable optical parametric oscillator,
the tunable optical parametric oscillator emits linear polarized pump light with the wavelength ranging from 3.8 to 4.7 microns, the pump light enters the isolator after passing through the telescope beam shaping device and enters the diamond Raman oscillator through the focusing lens;
the diamond Raman oscillator generates first-order Stokes light with the wavelength of 8-12 mu m through stimulated Raman scattering.
2. The long wavelength infrared raman laser of claim 1, wherein the optical isolator is configured to transmit pump light in a single direction.
3. The long-wave infrared raman laser according to claim 1, wherein the telescope beam shaping device is composed of two convex lenses, and the light-passing surfaces of the two convex lenses are both coated with a broadband dielectric film for increasing the transmittance of the pump light, so as to achieve the collimation and size adjustment of the light beam.
4. The long wavelength infrared raman laser of claim 1, wherein the diamond raman oscillator is comprised of an input mirror, a diamond crystal, and an output mirror.
5. A long-wave infrared Raman laser as claimed in claim 4, wherein said input mirror is a plano-concave mirror, the plano is coated with a broadband dielectric film for increasing the transmission of the pump light, and the concave is coated with a broadband dielectric film for increasing the transmission of the pump light and for high reflection of the Stokes light.
6. The long-wave infrared Raman laser device according to claim 4, wherein the cutting angle θ of the diamond crystal is 67.2 °, and both ends of the diamond crystal are not coated with a film, or are coated with a broadband dielectric film that is anti-reflective to Stokes light, or are coated with a broadband dielectric film that is anti-reflective to both pump light and Stokes light.
7. A long-wave infrared Raman laser as claimed in claim 4 wherein said output mirror is a plano-concave mirror with a concave surface coated with a broadband dielectric film partially transmissive to Stokes light and a planar surface coated with a broadband dielectric film highly transmissive to Stokes light.
8. The long wave infrared raman laser of claim 1, further comprising: a light filter for filtering light emitted from the light source,
the optical filter is a band-pass optical filter or a long-pass optical filter and is used for absorbing residual pump light.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020268832.2U CN211700916U (en) | 2020-03-06 | 2020-03-06 | Long-wave infrared Raman laser |
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| CN202020268832.2U CN211700916U (en) | 2020-03-06 | 2020-03-06 | Long-wave infrared Raman laser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112886370A (en) * | 2021-01-08 | 2021-06-01 | 中国科学院理化技术研究所 | Diamond Raman long-wave laser device and intrinsic absorption band pre-filling method |
| CN113725703A (en) * | 2021-09-02 | 2021-11-30 | 河北工业大学 | Raman laser oscillator with continuously tunable wavelength |
| CN114498280A (en) * | 2020-10-23 | 2022-05-13 | 中国科学院大连化学物理研究所 | Red laser, laser frequency conversion device and method for generating red laser |
| CN114696199A (en) * | 2022-03-31 | 2022-07-01 | 南京漫光微电子技术有限公司 | Femtosecond laser system capable of adjusting wavelength and use method |
-
2020
- 2020-03-06 CN CN202020268832.2U patent/CN211700916U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114498280A (en) * | 2020-10-23 | 2022-05-13 | 中国科学院大连化学物理研究所 | Red laser, laser frequency conversion device and method for generating red laser |
| CN114498280B (en) * | 2020-10-23 | 2024-01-12 | 中国科学院大连化学物理研究所 | Red light laser, laser frequency conversion device and method for generating red light laser |
| CN112886370A (en) * | 2021-01-08 | 2021-06-01 | 中国科学院理化技术研究所 | Diamond Raman long-wave laser device and intrinsic absorption band pre-filling method |
| CN112886370B (en) * | 2021-01-08 | 2022-05-31 | 中国科学院理化技术研究所 | Diamond Raman long-wave laser device and intrinsic absorption band pre-filling method |
| CN113725703A (en) * | 2021-09-02 | 2021-11-30 | 河北工业大学 | Raman laser oscillator with continuously tunable wavelength |
| CN114696199A (en) * | 2022-03-31 | 2022-07-01 | 南京漫光微电子技术有限公司 | Femtosecond laser system capable of adjusting wavelength and use method |
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