CN219801482U - Three-frequency laser rapid output device - Google Patents
Three-frequency laser rapid output device Download PDFInfo
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- CN219801482U CN219801482U CN202220869170.3U CN202220869170U CN219801482U CN 219801482 U CN219801482 U CN 219801482U CN 202220869170 U CN202220869170 U CN 202220869170U CN 219801482 U CN219801482 U CN 219801482U
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Abstract
The utility model discloses a three-frequency laser rapid output device, which comprises a laser, a laser regulator, a polarization beam splitter, a reflector group, a lens group, an acousto-optic modulator, a third lens, a shutter group, a quarter wave plate, a third reflector and a controller, wherein laser beams emitted by the laser are incident on the polarization beam splitter after passing through the laser regulator, then reflected by the reflector group, then are incident into the acousto-optic modulator after passing through the lens group, laser beams output by the acousto-optic modulator are changed into parallel light through the third lens, then pass through the shutter group, return in a primary way under the action of the third reflector after passing through the quarter wave plate, and finally are output through the reflecting surface of the polarization beam splitter; the controller respectively controls the working states of the reflector group, the acousto-optic modulator and the shutter group so as to adjust the sequence and the time interval of outputting the three-frequency laser and the output of the three-frequency laser by the reflecting surface of the polarization beam splitter. The utility model uses one acousto-optic modulator to quickly obtain the laser output of three frequencies, thereby reducing the cost of the device.
Description
Technical Field
The utility model relates to a multi-frequency laser output technology of an atmosphere detection laser radar, in particular to a three-frequency laser rapid output device.
Background
The sodium layer wind temperature detection laser radar uses sodium atoms existing in the 80-110km high-altitude atmosphere as a tracer, and can obtain wind field and temperature information of the high-altitude atmosphere by detecting Doppler frequency shift and broadening of fluorescence spectrum generated by exciting the sodium atoms by laser. The sodium layer temperature and wind measuring laser radar needs to output three lasers with different frequencies to excite sodium atoms respectively to obtain Doppler frequency shift and broadening information of sodium fluorescence spectrum. The rapid output of lasers with different frequencies is usually realized by using a two-way acousto-optic frequency shift optical path. The scheme for generating the three-frequency laser output based on the two-way acousto-optic frequency shift optical path of the free space comprises the following steps: scheme one "a Frequency-agile Na Lidar for the Measurement of Temperature and Velocity in the Mesopause Region", thesis (ph.d.), colorado State University,1999; scheme two, "Na Lidar at ALOMAR-electrooptic improvements, analysis algorithms, and selected atmospheric observations 80to100km above Northern Norway," repla thesis, ullm University, germany,2009; scheme III, an acousto-optic modulation device capable of outputting three wavelengths, chinese patent utility model, 201310368812.7. In the first scheme, the accurate time sequence control is needed to customize the chopper wheel to realize the switching output of the three-frequency laser, the device is complex, the realization difficulty is high, and the output sequence and the time interval of the three-frequency laser cannot be freely adjusted; in the second scheme, the modulated light coming out of the first acousto-optic modulator is reflected back through two reflectors, so that the light path adjustment difficulty is high, the requirement is high, and the stability of the system is also high; the scheme III utilizes the centre hole reflector and the optical shutter to realize the selective output of the frequency shift light and the original frequency light, the output sequence and the time interval of the three frequency lasers are convenient to adjust, but as in the scheme I and the scheme II, the f+ and the f-frequency are respectively obtained by two acousto-optic modulators, the optical path is longer, and the optical power loss is increased.
Disclosure of Invention
The utility model aims to: the utility model aims to provide a device capable of realizing rapid output of three-frequency laser.
The technical scheme is as follows: the utility model relates to a three-frequency laser rapid output device, which comprises a laser, a laser regulator, a polarization beam splitter, a reflector group, a lens group, an acousto-optic modulator, a third lens, a shutter group, a quarter wave plate, a third reflector and a controller, wherein laser beams emitted by the laser are incident on the polarization beam splitter after passing through the laser regulator, laser beams output by the polarization beam splitter are reflected by the reflector group and then are incident into the acousto-optic modulator after passing through the lens group, laser beams output by the acousto-optic modulator are changed into parallel light by the third lens and then pass through the shutter group, return in an original way under the action of the third reflector after passing through the quarter wave plate, and finally are output by a reflecting surface of the polarization beam splitter; the controller is respectively connected with the reflector group, the acousto-optic modulator and the shutter group, and respectively controls the working states of the reflector group, the acousto-optic modulator and the shutter group so as to adjust the sequence and the time interval of outputting the three-frequency laser and outputting the three-frequency laser by the reflecting surface of the polarization beam splitter.
Optionally, the laser regulator includes a collimator and a half-wave plate, the collimator performs beam shaping on the laser beam, and then outputs the laser beam with the same polarization direction as the transmitted light of the polarization beam splitter after passing through the half-wave plate.
Optionally, the collimator comprises two lenses placed in parallel.
Optionally, the mirror group includes a high-speed roll-over stand, a first mirror, and a second mirror, where the first mirror and the second mirror are sequentially placed in a light path of transmitted light of the polarization beam splitter, the first mirror is mounted on the high-speed roll-over stand, and an included angle α=pi/4- θ/2 between the first mirror and the transmitted light, where θ is a bragg angle of the acousto-optic modulator; the included angle beta=pi/4+theta/2 between the second reflecting mirror and the transmitted light; the high-speed roll-over stand is used for adjusting the working state of the first reflecting mirror.
Optionally, the lens group includes a first lens and a second lens, where the first lens is disposed in a reflection light path of the second reflector, the second lens is disposed in a reflection light path of the first reflector, and the acousto-optic modulator is disposed at a confocal point of the first lens and the second lens.
Optionally, the shutter group includes a first shutter and a second shutter, the first shutter and the second shutter are placed in parallel in a parallel optical path behind the third lens, and the first shutter is located in the same optical path as the first mirror and the second lens, and the second shutter is located in the same optical path as the second mirror and the first lens.
Optionally, the third lens is placed behind the acousto-optic modulator and at a distance from the acousto-optic modulator that is its focal length.
Optionally, a quarter wave plate and a third reflecting mirror are sequentially placed behind the shutter group and have the same optical axis as the third lens; an included angle of 45 degrees or 135 degrees is formed between the crystal axis direction of the quarter wave plate and the polarization direction of the light beam.
The beneficial effects are that: compared with the prior art, the utility model can realize that laser output with three frequencies can be obtained rapidly by using one acousto-optic modulator, thereby reducing the cost of the device; the high-speed roll-over stand and the shutter are applied to the light path, so that the time sequence of three-frequency laser output can be flexibly changed, the double-pass acousto-optic frequency shift light path is greatly shortened, the light path is more compact, the light path volume is reduced, and the light power loss of the light path is obviously reduced.
Drawings
FIG. 1 is a schematic view of the apparatus of the present utility model;
FIG. 2 is a diagram of the optical path of the device of the present utility model when outputting laser light of three frequencies, respectively; fig. 2a shows an optical path at an output frequency f0, fig. 2b shows an optical path at an output frequency f0+2fs, and fig. 2c shows an optical path at an output frequency f0-2 fs.
Detailed Description
The technical scheme of the utility model is further described below with reference to the attached drawings and specific embodiments.
As shown in fig. 1 to 2, the device capable of realizing rapid output of three-frequency laser according to the present utility model comprises a laser 1, a collimator 2, a half-wave plate 3, a polarization beam splitter 4, a high-speed roll-over stand 5, a first reflecting mirror 6, a second reflecting mirror 7, a first lens 8, a second lens 9, an acousto-optic modulator 10, a third lens 11, a first shutter 12, a second shutter 13, a quarter-wave plate 14, a third reflecting mirror 15 and a controller 16.
The outgoing light of the laser 1 is beam-shaped by a collimator 2, and the collimator 2 is composed of two parallel lenses. The light emitted from the collimator 2 passes through the half-wave plate 3 and then enters the polarization beam splitter 4; the polarization plane angle of the emergent light can be adjusted by adjusting the half wave plate 3, so that the polarization plane angle is consistent with the polarization direction of the transmitted light of the polarization beam splitter 4; the first reflecting mirror 6 and the second reflecting mirror 7 are sequentially arranged in a transmission light path of the polarization beam splitter 4, the first reflecting mirror 6 is arranged on the high-speed roll-over stand 5, and an included angle alpha = pi/4-theta/2 between the first reflecting mirror 6 and the transmission light is formed, wherein theta is the Bragg angle of the acousto-optic modulator 10; the included angle between the second reflecting mirror 7 and the transmitted light is beta=pi/4+theta/2; the light beam is reflected by the first reflecting mirror 6 or the second reflecting mirror 7, and then enters the acousto-optic modulator 10 through the first lens 8 or the second lens 9; an acousto-optic modulator 10 is placed at the confocal point of the first lens 8 and the second lens 9; the third lens 11 is placed behind the acousto-optic modulator 10 and at a distance from the acousto-optic modulator 10 of its focal length; the first shutter 12 and the second shutter 13 are placed in parallel optical paths behind the third lens 11, respectively; a quarter wave plate 14 and a third mirror 15 are placed behind the shutter in sequence and on the same optical axis as the third lens 11; an included angle of 45 degrees or 135 degrees is formed between the crystal axis direction of the quarter wave plate 14 and the polarization direction of the light beam; the controller 16 is connected to the high-speed roll-over stand 5, the acousto-optic modulator 10, the first shutter 12 and the second shutter 13, respectively, for controlling the rotation of the high-speed roll-over stand 5 and thus controlling whether the first reflecting mirror 6 is in the optical path or not, and for controlling the switching states of the acousto-optic modulator 10, the first shutter 12 and the second shutter 13 to adjust the sequence and the time interval of the three-frequency laser output.
The controller 16 is a device for realizing the rotation of the high-speed roll-over stand 5 by a computer through a programming language, and the switching states and switching times of the acousto-optic modulator 10, the first shutter 12 and the second shutter 13 are controlled, and a programming method thereof is common knowledge in the art.
The working process of the three-frequency laser rapid output device comprises the following steps:
the controller 16 controls the acousto-optic modulator 10 and the first shutter 12 to be closed, controls the second shutter 13 to be opened, and controls the high-speed roll-over stand 5 so that the first reflecting mirror 6 is not in the optical path; at this time, the light beam output by the laser 1 is collimated by the collimator 2 and is incident on the polarization beam splitter 4 after passing through the half-wave plate 3, the light transmitted by the polarization beam splitter 4 is reflected by the second reflecting mirror 7 and is converged by the first lens 8, then passes through the acousto-optic modulator 10, the laser frequency is not changed, the light beam passes through the second shutter 13 after being changed into parallel light by the third lens 11, returns in a first path under the action of the third reflecting mirror 15 after passing through the quarter-wave plate 14, and finally, the light f0 without frequency shift is output by the reflecting surface of the polarization beam splitter 4, as shown in fig. 2 (a);
the controller 16 controls the acousto-optic modulator 10 and the first shutter 12 to open and controls the second shutter 13 to close, at this time, the light beam reflected by the second reflecting mirror 7 passes through the acousto-optic modulator 10 and then undergoes a forward frequency shift, and the frequency-shifted light beam deviates from the original light beam by 2 theta angle; the frequency-shifted light passes through the first shutter 12 after being changed into parallel light by the third lens 11, is reflected by the third reflector 15 after passing through the quarter wave plate 14, and the reflected light beam passes through the acousto-optic modulator 10 again to generate secondary forward frequency shift, and the frequency-shifted light f0+2fs is finally output by the reflecting surface of the polarization beam splitter 4, as shown in fig. 2 (b);
the controller 16 controls the acousto-optic modulator 10 and the second shutter 13 to open, controls the first shutter 12 to close, and controls the high-speed roll-over stand 5 to place the first reflecting mirror 6 in the optical path; at this time, the light beam reflected by the first reflecting mirror 6 passes through the acousto-optic modulator 10 and then undergoes a negative frequency shift, and the frequency-shifted light beam deviates from the original light beam by 2 theta angle; the frequency-shifted light is changed into parallel light by the third lens 11, passes through the second shutter 13, passes through the quarter wave plate 14, is reflected by the third reflector 15, and the reflected light beam passes through the acousto-optic modulator 10 again to generate secondary negative frequency shift, and the frequency-shifted light f0-2fs is finally output by the reflecting surface of the polarization beam splitter 4, as shown in fig. 2 (c).
Claims (8)
1. The three-frequency laser rapid output device is characterized by comprising a laser (1), a laser regulator, a polarization beam splitter (4), a reflector group, a lens group, an acousto-optic modulator (10), a third lens (11), a shutter group, a quarter wave plate (14), a third reflector (15) and a controller (16), wherein laser beams emitted by the laser (1) are incident on the polarization beam splitter (4) after passing through the laser regulator, laser beams output by the polarization beam splitter (4) are reflected by the reflector group and then are incident into the acousto-optic modulator (10) after passing through the lens group, laser beams output by the acousto-optic modulator (10) are changed into parallel light through the third lens (11) and then pass through the shutter group, return in an original way under the action of the third reflector (15) after passing through the quarter wave plate (14), and finally are output through the reflecting surface of the polarization beam splitter (4); the controller (16) is respectively connected with the reflector group, the acousto-optic modulator (10) and the shutter group, and respectively controls the working states of the reflector group, the acousto-optic modulator (10) and the shutter group so as to adjust the sequence and the time interval of outputting the three-frequency laser and outputting the three-frequency laser by the reflecting surface of the polarization beam splitter (4).
2. The three-frequency laser rapid output device according to claim 1, wherein the laser regulator comprises a collimator (2) and a half-wave plate (3), the collimator (2) performs beam shaping on the laser beam, and then outputs the laser beam with the polarization direction consistent with that of the transmitted light of the polarization beam splitter (4) after passing through the half-wave plate (3).
3. A three frequency laser fast output device according to claim 2, characterized in that the collimator (2) comprises two lenses placed in parallel.
4. The three-frequency laser rapid output device according to claim 1, wherein the mirror group comprises a high-speed roll-over stand (5), a first mirror (6) and a second mirror (7), the first mirror (6) and the second mirror (7) are sequentially arranged in a transmission light path of the polarization beam splitter (4), the first mirror (6) is arranged on the high-speed roll-over stand (5), and an included angle alpha = pi/4-theta/2 between the first mirror and the transmission light is formed, wherein theta is a bragg angle of the acousto-optic modulator (10); an included angle beta=pi/4+theta/2 between the second reflecting mirror (7) and the transmitted light; the high-speed roll-over stand (5) is used for adjusting the working state of the first reflecting mirror (6).
5. The three-frequency laser rapid output device according to claim 4, wherein the lens group comprises a first lens (8) and a second lens (9), wherein the first lens (8) is disposed in a reflection light path of the second mirror (7), the second lens (9) is disposed in a reflection light path of the first mirror (6), and the acousto-optic modulator (10) is disposed at a confocal point of the first lens (8) and the second lens (9).
6. The three-frequency laser rapid output device according to claim 5, characterized in that the shutter group comprises a first shutter (12) and a second shutter (13), the first shutter (12) and the second shutter (13) are juxtaposed in a parallel light path behind the third lens (11), the first shutter (12) is located in the same light path as the first mirror (6) and the second lens (9), and the second shutter (13) is located in the same light path as the second mirror (7) and the first lens (8).
7. A three-frequency laser fast output device according to claim 1, characterized in that the third lens (11) is placed behind the acousto-optic modulator (10) at a distance from the acousto-optic modulator (10) of its focal length.
8. A three frequency laser fast output device according to claim 1, characterized in that a quarter wave plate (14) and a third mirror (15) are placed in sequence behind the shutter set and on the same optical axis as the third lens (11); an included angle of 45 degrees or 135 degrees is formed between the crystal axis direction of the quarter wave plate (14) and the polarization direction of the light beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220869170.3U CN219801482U (en) | 2022-04-15 | 2022-04-15 | Three-frequency laser rapid output device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220869170.3U CN219801482U (en) | 2022-04-15 | 2022-04-15 | Three-frequency laser rapid output device |
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| Publication Number | Publication Date |
|---|---|
| CN219801482U true CN219801482U (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220869170.3U Active CN219801482U (en) | 2022-04-15 | 2022-04-15 | Three-frequency laser rapid output device |
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