CN214478418U - Integrated medium wave infrared laser radar transmitting device - Google Patents
Integrated medium wave infrared laser radar transmitting device Download PDFInfo
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- CN214478418U CN214478418U CN202023258248.8U CN202023258248U CN214478418U CN 214478418 U CN214478418 U CN 214478418U CN 202023258248 U CN202023258248 U CN 202023258248U CN 214478418 U CN214478418 U CN 214478418U
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Abstract
The utility model discloses an integrated medium wave infrared laser radar transmitting device, which comprises an LD pumping laser light source, a laser crystal, a nonlinear frequency doubling crystal and a filter plate which are arranged in sequence; the LD pumping laser light source is used as a light source to emit laser to the laser crystal; the laser crystal is used for generating pulse laser to emit to the nonlinear frequency doubling crystal; the nonlinear frequency doubling crystal is used for doubling the frequency of the laser; the filter is used for filtering partial light beams of the frequency doubled laser; the LD pump laser light source, the laser crystal, the nonlinear frequency doubling crystal and the filter are of an integrated packaging structure and generate medium wave infrared laser output. The utility model discloses a laser radar produces the infrared laser output of medium wave to launch away laser with the scanning form, realized radar transmitting end signal multi-angle scanning.
Description
Technical Field
The utility model belongs to the technical field of the laser, concretely relates to infrared laser radar emitter of integral type medium wave.
Background
The laser radar is a radar system for detecting characteristic quantities such as position, speed and the like of a target by transmitting a laser beam based on a TOF principle, and is widely applied to the military field and the civil field. The application of the laser radar in the field of intelligent driving has great potential, but the laser radar is difficult to be widely applied due to the existence of a plurality of unsolvable technical problems, such as: the laser wave band is difficult to separate from the spectrum band accepted by the monitoring system widely used at the present stage, so that interference can be generated on the existing monitoring system; laser may cause harm to human eyes when used; are susceptible to sunlight interference.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the prior art, provide an infrared laser radar emitter of integral type medium wave, solve current laser radar and easily produce the problem that disturbs, be harmful to the eyes and easily receive sunlight interference to monitored control system.
The utility model provides a following technical scheme:
an integrated medium wave infrared laser radar transmitting device comprises an LD pumping laser light source, a laser crystal, a nonlinear frequency doubling crystal and a filter plate which are sequentially arranged;
the LD pumping laser light source is used as a light source to emit laser to the laser crystal;
the laser crystal is used for generating pulse laser to emit to the nonlinear frequency doubling crystal;
the nonlinear frequency doubling crystal is used for doubling the frequency of the laser;
the filter is used for filtering partial light beams of the frequency doubled laser;
the LD pump laser light source, the laser crystal, the nonlinear frequency doubling crystal and the filter are of an integrated packaging structure and generate medium wave infrared laser output.
Preferably, the LD pump laser light source emits laser light with a wavelength of 808 nm.
Preferably, the laser crystal is Nd: YAG crystal which generates 1064nm laser; along the laser transmission direction, a Q-switched crystal is bonded or grown on the laser crystal, wherein the Q-switched crystal is a Cr: YAG crystal, and the Cr: YAG crystal generates a Q-switched pulse.
Preferably, along the laser transmission direction, the incident surface and the exit surface of the laser crystal are respectively plated with a first light control film group and a second light control film group, and the first light control film group and the second light control film group respectively comprise a plurality of high-transmittance films and high-reflectance films which are arranged in any order.
Preferably, the nonlinear frequency doubling crystal is one of a PPLN crystal, a PPKTP crystal and a PPGaAs crystal.
Preferably, along the laser transmission direction, the incident surface of the nonlinear frequency doubling crystal is cut according to the brewster angle, the exit surface is coated with a third light control film group, and the third light control film group comprises a high reflection film, a first partial reflection film and a second partial reflection film which are arranged in any order.
Preferably, the wavelength band reflected by the high reflection film is 1064nm, and the wavelength bands reflected by the first partial reflection film and the second partial reflection film are 1.6 μm or 3 μm.
Preferably, the filter filters out other light beams outside a 3 μm band required for output.
Preferably, the vibration isolator further comprises a first micro vibration mirror and a second micro vibration mirror, wherein the rotation axes of the first micro vibration mirror and the second micro vibration mirror are perpendicular to each other, the first micro vibration mirror is driven to rotate by first piezoelectric ceramics, and the second micro vibration mirror is driven to rotate by second piezoelectric ceramics.
Preferably, the first micro galvanometer and the second micro galvanometer are made of germanium sheets or sapphire. Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model comprises an LD pump laser light source, a laser crystal, a nonlinear frequency doubling crystal and a filter plate which are arranged in sequence, wherein the LD pump laser light source is used for emitting laser to the laser crystal as a light source, the laser crystal is used for generating pulse laser to irradiate the nonlinear frequency doubling crystal, the nonlinear frequency doubling crystal is used for doubling the frequency of the laser, and the filter plate is used for filtering partial light beams of the laser after frequency doubling; the laser radar generates medium wave infrared laser output and emits the laser in a scanning mode, so that multi-angle scanning of signals at a radar emitting end is realized, and the wave band of the medium wave infrared laser is separated from the spectrum band accepted by the monitoring system widely used at the present stage, so that the interference on the existing monitoring system is avoided; the laser of the medium wave infrared band has strong absorptivity in water, and the main component in the structure of the eyeball of the human eye is water, so that the medium wave infrared laser can be absorbed by the water in the eye tissue without damaging the tissue structure of the eye tissue, and is safe for the human eye in daily use; the medium-wave infrared laser has a wave band of 3 mu m, so that the interference of sunlight can not be caused;
(2) the utility model discloses well LD pumping laser light source, laser crystal, nonlinear doubling of frequency crystal and filter formula packaging structure as an organic whole, small, simple structure, the heat dissipation is even.
Drawings
FIG. 1 is a schematic diagram of the laser radar of the present invention;
labeled as: 1. an LD pump laser light source; 2. a first light control film group; 3. a laser crystal; 4. q-switched crystal; 5. a second light control film group; 6. a nonlinear frequency doubling crystal; 7. a third light control film group; 8. a filter plate; 9. a first piezoelectric ceramic; 10. a first micro galvanometer; 11. a second micro galvanometer; 12. a second piezoelectric ceramic.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, an integrated medium wave infrared laser radar transmitting device includes an LD pump laser light source 1, a laser crystal 3, a nonlinear frequency doubling crystal 6, and a filter 8, which are arranged in sequence; the LD pumping laser light source 1 is used as a light source to emit laser to the laser crystal 3; the laser crystal 3 is used for generating pulse laser to irradiate the nonlinear frequency doubling crystal 6; the nonlinear frequency doubling crystal 6 is used for frequency doubling the laser; the filter 8 is used for filtering part of the light beams of the frequency doubled laser; the LD pump laser light source 1, the laser crystal 3, the nonlinear frequency doubling crystal 6 and the filter 8 are of an integrated packaging structure and generate medium wave infrared laser output.
The LD pump laser light source 1 emits laser light with a wavelength of 808 nm.
The laser crystal 3 is Nd: YAG crystal which generates 1064nm laser; along the laser transmission direction, a Q-switched crystal 4 is bonded or grown on the laser crystal 3, wherein the Q-switched crystal 4 is a Cr: YAG crystal, and the Cr: YAG crystal generates a Q-switched pulse.
Along the laser transmission direction, the incident surface and the emergent surface of the laser crystal 3 are respectively plated with a first light control film group 2 and a second light control film group 5; the first light control film group 2 is a 808nm high-transmittance film and a 1064nm high-reflectance film which are plated in sequence, or a 1064nm high-reflectance film and a 808nm high-transmittance film which are plated in sequence; the second light control film group 5 is a 1064nm high-transmittance film, a 3 mu m high-reflectance film and a 1.6 mu m high-reflectance film which are plated in sequence, or a 3 mu m high-reflectance film, a 1.6 mu m high-reflectance film and a 1064nm high-transmittance film which are plated in sequence. The sequence of the high-reflection film and the high-transmission film in the first light control film group 2 and the second light control film group 5 does not influence the result, the function of the high-reflection film is to control the light inlet and outlet amount, the function of the 808nm high-transmission film is to increase the light inlet of 808nm, the function of the 1064nm high-reflection film is to reduce the light inlet of 1064nm, the function of the 1064nm high-transmission film is to increase the light inlet of 1064nm, the function of the 3 mu m high-reflection film is to reduce the light inlet of 3 mu m, the function of the 1.6 mu m high-reflection film is to reduce the light inlet of 1.6 mu m, and the incident plane and the emergent plane of the laser crystal 3 are parallel to each other and are vertical to the laser beam direction.
The nonlinear frequency doubling crystal 6 is one of a PPLN crystal, a PPKTP crystal and a PPGaAs crystal. Along the laser transmission direction, the incident plane of the nonlinear frequency doubling crystal 6 is cut according to the Brewster angle, and the function is to generate polarized light; the emergent surface is plated with a third light control film group 7, and the third light control film group 7 comprises a 1064nm high-reflection film, a 3 mu m partial reflection film and a 1.6 mu m partial reflection film which are sequentially plated, or a 3 mu m partial reflection film, a 1.6 mu m partial reflection film and a 1064nm high-reflection film which are sequentially plated. The sequence of the high-reflection film and the partial reflection film does not influence the result, the film coating has the function of controlling the light inlet and outlet amount, the 1064nm high-reflection film has the function of reducing the light inlet of 1064nm, the 3 mu m partial reflection film has the function of controlling the light inlet of 3 mu m, the 1.6 mu m partial reflection film has the function of controlling the light inlet of 1.6 mu m, and the emergent surface of the nonlinear frequency doubling crystal is vertical to the laser beam direction.
The filter 8 is used for filtering 1.6 μm light and allowing 3 μm light to enter, and the incident surface and the emergent surface of the filter 8 are parallel to each other and perpendicular to the direction of the laser beam.
The integrated medium wave infrared laser radar transmitting device provided by the embodiment further comprises a first micro vibrating mirror 10 and a second micro vibrating mirror 11, wherein the rotating shafts of the first micro vibrating mirror 10 and the second micro vibrating mirror 11 are perpendicular to each other, the first micro vibrating mirror 10 is driven to rotate by first piezoelectric ceramics 9, and the second micro vibrating mirror 11 is driven to rotate by second piezoelectric ceramics 12. The first piezoelectric ceramic 9 and the second piezoelectric ceramic 12 are controlled by electric signals, and the first micro vibrating mirror 10 and the second micro vibrating mirror 11 are made of germanium sheets or sapphire.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (10)
1. An integrated medium wave infrared laser radar transmitting device is characterized by comprising an LD pumping laser light source, a laser crystal, a nonlinear frequency doubling crystal and a filter plate which are sequentially arranged;
the LD pumping laser light source is used as a light source to emit laser to the laser crystal;
the laser crystal is used for generating pulse laser to emit to the nonlinear frequency doubling crystal;
the nonlinear frequency doubling crystal is used for doubling the frequency of the laser;
the filter is used for filtering partial light beams of the frequency doubled laser;
the LD pump laser light source, the laser crystal, the nonlinear frequency doubling crystal and the filter are of an integrated packaging structure and generate medium wave infrared laser output.
2. The integrated mid-wave infrared lidar transmitting device of claim 1, wherein the LD pump laser light source emits 808nm wavelength laser light.
3. The integrated mid-wave infrared lidar transmission device of claim 1, wherein the laser crystal is a Nd: YAG crystal that produces 1064nm laser light; along the laser transmission direction, a Q-switched crystal is bonded or grown on the laser crystal, wherein the Q-switched crystal is a Cr: YAG crystal, and the Cr: YAG crystal generates a Q-switched pulse.
4. The integrated mid-wave infrared lidar transmitting device of claim 1, wherein along the laser transmission direction, the incident surface and the exit surface of the laser crystal are respectively coated with a first light control film group and a second light control film group, and the first light control film group and the second light control film group respectively comprise a plurality of high-transmittance films and high-reflectance films which are arranged in any order.
5. The integrated mid-wave infrared lidar transmitting device of claim 1, wherein the nonlinear frequency doubling crystal is one of a PPLN crystal, a PPKTP crystal, and a PPGaAs crystal.
6. The integrated mid-wave infrared lidar transmitting device of claim 1, wherein along the laser transmission direction, the incident surface of the nonlinear frequency doubling crystal is cut according to the brewster angle, the exit surface is coated with a third light control film group, and the third light control film group comprises a high reflection film, a first partial reflection film and a second partial reflection film which are arranged in any order.
7. The integrated mid-wave infrared lidar transmission device of claim 6, wherein the wavelength band reflected by the high reflection film is 1064nm, and the wavelength band reflected by the first partially reflective film and the second partially reflective film is 1.6 μm or 3 μm.
8. The integral mid-wave infrared lidar transmitting device of claim 1, wherein the filter filters out other beams outside a desired 3 μm band.
9. The integrated medium wave infrared lidar transmitting device of claim 1, further comprising a first micro galvanometer and a second micro galvanometer having axes of rotation perpendicular to each other, the first micro galvanometer being driven to rotate by the first piezoelectric ceramic, and the second micro galvanometer being driven to rotate by the second piezoelectric ceramic.
10. The integrated medium wave infrared lidar transmitting device of claim 9, wherein the first micro galvanometer and the second micro galvanometer are made of germanium sheets or sapphire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023258248.8U CN214478418U (en) | 2020-12-29 | 2020-12-29 | Integrated medium wave infrared laser radar transmitting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023258248.8U CN214478418U (en) | 2020-12-29 | 2020-12-29 | Integrated medium wave infrared laser radar transmitting device |
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| Publication Number | Publication Date |
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| CN214478418U true CN214478418U (en) | 2021-10-22 |
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| CN202023258248.8U Active CN214478418U (en) | 2020-12-29 | 2020-12-29 | Integrated medium wave infrared laser radar transmitting device |
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