CN110045496A - A kind of Sodium guide star atmospheric laser link compensation system - Google Patents
A kind of Sodium guide star atmospheric laser link compensation system Download PDFInfo
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- CN110045496A CN110045496A CN201910251890.6A CN201910251890A CN110045496A CN 110045496 A CN110045496 A CN 110045496A CN 201910251890 A CN201910251890 A CN 201910251890A CN 110045496 A CN110045496 A CN 110045496A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/06—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the phase of light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
Abstract
The present invention relates to adaptive optics system technical fields, more particularly to a kind of Sodium guide star atmospheric laser link compensation system comprising first laser beam-expanding system, dichronic mirror, distorting lens, closes beam beam-expanding system, Wavefront detecting and control system, reflecting mirror and Calibrating source at second laser beam-expanding system.The system laser different from sodium optical maser wavelength with another beam, the transmitting of combiner Shared aperture is swashed with sodium, it is assembled at the atmosphere on sodium laser emission path, generate atmospheric backscatter, it is measured using back scattering image and compensates atmospheric turbulance distortion, the phase distortion opposite with atmospheric turbulance can be then carried when sodium laser emitting, it is offseted by atmospheric turbulance Shi Yuqi, when sodium laser being made to reach the convergence of sodium layer, it is distributed with flatter wavefront, spot diameter is smaller, energy density is higher, be conducive to reduce ground-based optical telescope adaptive optics system measurement error, improve image correction effect.
Description
Technical field
The present invention relates to adaptive optics system technical fields, and in particular to a kind of Sodium guide star atmospheric laser link compensation system
System.
Background technique
Sodium guide star laser technology refer to using a branch of centre frequency can with sodium atom transition spectral line resonate laser, excitation away from
The sodium layer of ground level about 92km issues resonance rear orientation light, as the guidance light source of adaptive optics system, has sampling
The advantages that highly high.But in practical applications, Sodium guide star laser beam uplink process will receive the interference of atmospheric turbulance, laser
Wavefront distribution is distorted, and is deteriorated in sodium layer convergence characteristics, and asterism is spread, center intensity decline, the i.e. angular width of Sodium guide star
Degree increases, brightness decline, and then primary telescope adaptive optics system measurement wavefront error is caused to increase, and reduces correction and high score
The effect of resolution imaging.
In consideration of it, overcoming the above defect in the prior art, a kind of new Sodium guide star atmospheric laser link compensation system is provided
System becomes this field technical problem urgently to be resolved.
Summary of the invention
It is an object of the invention in view of the above drawbacks of the prior art, provide a kind of Sodium guide star atmospheric laser link compensation
System.
The purpose of the present invention can be realized by technical measures below:
The present invention provides a kind of Sodium guide star atmospheric laser link compensation system, which includes:
First laser beam-expanding system, dichronic mirror, distorting lens and the conjunction beam for being arranged successively setting along transmitting optical path expand and are
System, Wavefront detecting and control system on the dichroic mirror direction are located at the conjunction beam beam-expanding system incident direction
On second laser beam-expanding system and set on the distorting lens and it is described close beam beam-expanding system between reflecting mirror and nominal light
Source, the reflecting mirror is used to cut the Calibrating source/cut out optical path；
The first laser beam-expanding system is for emitting first laser and carrying out collimator and extender to the first laser；It is described
Second laser beam-expanding system is for emitting second laser and carrying out collimator and extender to the second laser；The Wavefront detecting and control
System processed includes wave front detector and wavefront controller, and the wave front detector is described for measuring Wave-front phase distributed intelligence
Wavefront controller is for control signal needed for handling the Wave-front phase distributed intelligence and exporting the distorting lens；
The first laser that the first laser beam-expanding system issues successively passes through the dichronic mirror, distorting lens, described
It closes beam beam-expanding system to emit to free space and assemble at sodium layer, the second laser warp that the second laser beam-expanding system issues
Generation Returning beam is assembled in transmitting to free space and at atmosphere after crossing the conjunction beam beam-expanding system, and Returning beam successively passes through
Enter the Wavefront detecting and control system after crossing the conjunction beam beam-expanding system, the distorting lens, the dichronic mirror, in the wave
Before preceding detector and wavefront controller work, the wavefront controller controls the reflecting mirror and cuts the Calibrating source
Enter optical path, to demarcate the control matrix of the wavefront controller, after calibration, the wavefront controller controls the reflecting mirror
The Calibrating source is cut out into optical path, the Wave-front phase distributed intelligence of the wave front detector measurement Returning beam, the wavefront
Control signal needed for controller handles the Wave-front phase distributed intelligence and exports the distorting lens controls the distorting lens and produces
The raw face shape opposite with current wavefront, to offset the wavefront of Returning beam, so that realization is swashed by first that first laser device issues
Light pre-compensates for before passing through the laggard traveling wave of the distorting lens.
Preferably, the first laser beam-expanding system includes the first laser device being arranged successively and the first beam expander, described
First laser enters the dichronic mirror after the first beam expander carries out collimator and extender.
Preferably, the second laser beam-expanding system includes the second laser being arranged successively and the second beam expander, described
Second laser enters the conjunction beam beam-expanding system after the second beam expander carries out collimator and extender.
Preferably, the linear polarization of the first laser and the linear polarization of the second laser are mutually perpendicular to.
Preferably, the beam beam-expanding system that closes includes: that the polarization spectroscope, quarter-wave plate and third being arranged successively expand
Beam device, the first laser from the distorting lens outgoing after successively by the polarization spectroscope, the quarter-wave plate and
After the third beam expander, transmitting is assembled to free space and at sodium layer, and the second laser is expanded from the second laser
After system exit successively after the polarization spectroscope, the quarter-wave plate and the third beam expander, transmitting is to certainly
It is assembled by space and in atmosphere.
Preferably, the Wavefront detecting and control system further include: shrink beam device, optical switch, high-voltage amplifier, delayer
And high-voltage drive, the shrink beam device by the Returning beam shrink beam from the dichronic mirror to transmit the optical switch and and wave
Preceding detector inputs consistent bore, and controls the optical switch selectively by the delayer and the high-voltage drive
By Returning beam, the wave front detector measures the Wave-front phase distributed intelligence of the Returning beam by the optical switch,
The wavefront controller acquires the Wave-front phase distributed intelligence and resolves control voltage, and the high-voltage amplifier amplifies the control
The distorting lens is controlled after voltage processed generates the face shape opposite with current wavefront.
Preferably, the delayer and the second laser communicate to connect, and the delayer is according to the second laser
Device synchronization signal controls the optical switch operating status.
Preferably, the first laser is sodium laser, and the second laser is different from the wavelength of the first laser.
System of the invention swashs combiner Shared aperture using two beams and emits, and second laser is in first laser transmission path
It is assembled at atmosphere, generates atmospheric backscatter, measure and compensate atmospheric turbulance distortion using back scattering image, when first sharp
Light can then carry the phase distortion opposite with atmospheric turbulance when being emitted, and offset by atmospheric turbulance Shi Yuqi, make first to swash
It when light reaches the convergence of sodium layer, is distributed with flatter wavefront, spot diameter is smaller, and energy density is higher, is conducive to reduce ground
Base optical telescope adaptive optics system measurement error improves image correction effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Sodium guide star atmospheric laser link compensation system of the invention.
Wherein: 1 first laser device, 2 first beam expanders, 3 dichronic mirrors, 4 distorting lens, 5 polarization spectroscopes, 6 quarter-waves
Piece, 7 third beam expanders, 8 second lasers, 9 second beam expanders, 10 shrink beam devices, 11 optical switches, 12 wave front detectors, 13 waves
Preceding controller, 14 high-voltage amplifiers, 15 delayers, 16 high-voltage drives, 17 Wavefront detectings and control system, 18 first lasers expand
Beam system, 19 second laser beam-expanding systems, 20 close beam beam-expanding system, 21 Calibrating sources, 22 reflecting mirrors.
Fig. 2 is Sodium guide star atmospheric laser link compensation system of the invention in 0 ° of zenith angle, when the work of optical switch
Sequence figure.
Fig. 3 is Sodium guide star atmospheric laser link compensation system of the invention in 60 ° of zenith angles, when the work of optical switch
Sequence figure.
Fig. 4 is in Sodium guide star atmospheric laser link compensation system of the invention with the optical path direction of -45 degree incision reflecting mirrors
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawing and specific implementation
Invention is further described in detail for example.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention,
It is not intended to limit the present invention.
In order to keep the narration of this disclosure more detailed with it is complete, below for embodiments of the present invention and specific real
It applies example and proposes illustrative description；But this not implements or uses the unique forms of the specific embodiment of the invention.Embodiment
In cover multiple specific embodiments feature and to construction with operate these specific embodiments method and step it is suitable with it
Sequence.However, can also reach identical or impartial function and sequence of steps using other specific embodiments.
Embodiment of the invention discloses a kind of Sodium guide star atmospheric laser link compensation system, the system another beam and sodium
The different laser of optical maser wavelength swashs the transmitting of combiner Shared aperture with sodium, assembles, produce at the atmosphere on sodium laser emission path
Raw atmospheric backscatter, the technologies such as utilization is time gated, polarization spectro, spectrum color separation, is measured and is mended by back scattering image
Atmospheric turbulance distortion is repaid, can then carry the phase distortion opposite with atmospheric turbulance when sodium laser emitting, is passing through atmospheric turbulance
Shi Yuqi is offseted, and when sodium laser being made to reach the convergence of sodium layer, is distributed with flatter wavefront, spot diameter is smaller, and energy is close
Du Genggao is conducive to reduce ground-based optical telescope adaptive optics system measurement error, improves image correction effect.
Fig. 1 shows a kind of Sodium guide star atmospheric laser link compensation system, which includes: to be arranged successively along transmitting optical path
First laser beam-expanding system 18, dichronic mirror 3, distorting lens 4 and the conjunction beam beam-expanding system 20 of setting, are located at 3 reflection side of dichronic mirror
Upward Wavefront detecting and control system 17, positioned at the second laser beam-expanding system 19 closed in 20 incident direction of beam beam-expanding system with
And set on distorting lens 4 and the reflecting mirror 22 and Calibrating source 21 between beam beam-expanding system 20 are closed, reflecting mirror 22 is used for nominal light
Source 21 cuts/cut out optical path.
The first laser that first laser beam-expanding system 18 issues successively passes through dichronic mirror 3, distorting lens 4, closes beam beam-expanding system
20 transmittings are assembled to free space and in the sodium layer (sodium thickness degree is about 10km) at ground about 92km, excitation sodium atom hair
Resonance light scattering out.
Since first laser will receive the influence of atmospheric turbulance in transmission process, cause to will appear diffusion effect in sodium layer
It answers, the decline of central energy density, therefore, the first laser that first laser beam-expanding system 18 issues needs in transmission process to big
It is compensated before gas turbulent wave.The second laser that second laser beam-expanding system 19 issues is by closing the transmitting of beam beam-expanding system 20 to certainly
It is assembled by space and in atmosphere, generates back scattering light beam, height of the atmosphere apart from ground can be 15km, but unlimited
In 15km, returning to the back scattering light beam in reflected light path is Returning beam, Returning beam successively through conjunction beam beam-expanding system 20,
Enter Wavefront detecting and control system 17 after distorting lens 4, dichronic mirror 3, Wavefront detecting and control system 17 measure Returning beam
Wavefront (i.e. atmospheric turbulance) phase distribution information, and Wave-front phase distributed intelligence is handled, control voltage needed for output skew mirror 4
It controls distorting lens 4 and generates the face shape opposite with current wavefront, to offset the interference of atmospheric turbulance, according to light path principle, the
The first laser that one laser beam expanding system 18 issues carries corresponding wavefront compensation after distorting lens 4, and is passing through atmosphere
It is corrected when turbulent flow, is distributed when reaching sodium layer with relatively flat Wave-front phase in time, the energy for improving focused light spot is concentrated
Degree, to reduce the angular breadth distribution of Sodium guide star and improve its brightness.
Wherein, first laser beam-expanding system 18 for emit first laser and to first laser carry out collimator and extender, first
Laser is sodium laser, and first laser beam-expanding system 18 includes the first laser device 1 being arranged successively and the first beam expander 2, and first swashs
The first laser that light device 1 issues is linearly polarized light, and linear polarization is vertical direction, and first laser device 1 is to need to pre-compensate for
Laser, the first beam expander 2 has the function of focusing and zoom, it can be achieved that first laser can under different zenith angles
Gather the sodium layer at about 92km.
Second laser beam-expanding system 19 for emit second laser and to second laser carry out collimator and extender, second laser with
The wavelength of first laser is different, and in the present embodiment, the wavelength of first laser is 589nm, and the wavelength of second laser can be
532nm or 355nm, but it is not limited to 532nm or 355nm.Second laser beam-expanding system 19 includes the second laser 8 being arranged successively
With the second beam expander 9, the second laser that second laser 8 issues is linearly polarized light, and linear polarization is horizontal direction, i.e., the
The linear polarization of one laser and the linear polarization of second laser are mutually perpendicular to, and the second beam expander 9 has focusing and zoom
Function is, it can be achieved that second laser can converge at the atmosphere at about 15km under different zenith angles.
Dichronic mirror 3 transmits first laser reflected second laser simultaneously；Face shape can be changed in distorting lens 4, can adjust by it
The light path of the light beam on surface.
Closing beam beam-expanding system 20 includes: the polarization spectroscope 5, quarter-wave plate 7 and third beam expander 7 being arranged successively,
Wherein, polarization spectroscope 5 can transmit the light beam of a certain polarization direction, but reflect the light of the polarization direction vertical with the direction
Beam, in the present embodiment, the linearly polarized light (i.e. first laser) in 5 transmissive Homeotropic direction of polarization spectroscope, reflection levels direction
Linearly polarized light (i.e. second laser)；Quarter-wave plate 7 can simultaneously in first laser wave band and second laser band operation, and
So that the light beam through the quarter-wave plate 7 is occurred 90 ° of phase delay, quarter-wave plate 7 may be implemented linearly polarized light with
Mutual conversion between circularly polarized light, in the present embodiment, quarter-wave plate 7 can will be emitted to free space from transmitting optical path
Linearly polarized light be converted to circularly polarized light, can also will from free space back to transmitting optical path circularly polarized light be converted to linear polarization
Light；Third beam expander 7 for changing light beam diameter.
Wavefront detecting and control system 17 include: shrink beam device 10, optical switch 11, wave front detector 12, wavefront controller
13, high-voltage amplifier 14, delayer 15 and high-voltage drive 16, Returning beam is compressed to by shrink beam device 10 first can be with transmitted light
It learns switch 11 and inputs consistent bore with wave front detector 12, optical switch is controlled by delayer 15 and high-voltage drive 16
11 optionally through Returning beam, and wave front detector can be entered by only detecting a certain range of Returning beam near height
12,12 pairs of the wave front detector Returning beams through optical switch 11 measure, and acquire the wavefront phase information of Returning beam,
Wavefront controller 13 acquires wavefront phase information and resolves corresponding control voltage, and control voltage is after the amplification of high-voltage amplifier 14
It controls distorting lens 4 and generates the face shape opposite with current wavefront, to offset the wavefront of Returning beam.
Further, delayer 15 and second laser 8 communicate to connect, and delayer 15 is by 8 synchronization signal of second laser
Triggering exports the delay of the pulse signal control optical switch 11 of corresponding frequency and width according to the zenith angle of transmitter-telescope
With opening/closing time and then control enters time and the width of the Returning beam of wave front detector 12.
In the present embodiment, refer to Fig. 2, Fig. 2 with repetition rate is 1kHz, pulse for 10ns 532nm laser and day
For apex angle is 0 °, demonstrates and what depth at 15km was selectively passed through for the Returning beam within the scope of 600m is located to center
Pulse sequence figure, at this point, the vertical range on centre distance ground is 15km, it is assumed herein that the atmosphere of rear orientation light can be generated
Height is 30km, and ignores influence of the pulse width to timing.It is t when being located at each impulse ejection0Moment, then delayer 15
After postponing 98 μ s, optical switch 11 is opened, and close in 102 μ s, herein, only opened between 102 μ s by optics in 98 μ s
Close the part that 11 part Returning beam needs to measure for wave front detector 12.In another preferred embodiment, it refers to
Fig. 3, Fig. 3 be by repetition rate be 1kHz, pulse for 10ns 532nm laser and 60 ° of zenith angle for, the center of demonstrating is located at
Depth is the pulse sequence figure that the Returning beam within the scope of 1200m is selectively passed through at 30km, at this point, centre distance is looked in the distance
The distance of mirror is 30km, and the vertical range on centre distance ground is still 15km, and Vertical Sampling distance is still 600m.At this point, optics
11 opening time of switch is that 196 μ s herein, only pass through optics between 204 μ s in 196 μ s between 204 μ s after pulse issues
The part Returning beam of switch 11 is the part that wave front detector 12 needs to measure.
Further, the capable of emitting light greater than 4 bore of distorting lens, with the distribution of ideal plane wave wavefront of Calibrating source 21
Source.Further, reflecting mirror 22 is set on motorized precision translation stage, and wavefront controller 13 controls with motorized precision translation stage and connects and pass through
Control motorized precision translation stage movement drive reflecting mirror 22 cut/cut out optical path, work in wave front detector 12 and wavefront controller 13
Before, it controls reflecting mirror 22 by wavefront controller 13 to cut in optical path, reflecting mirror 22 cuts Calibrating source 21 to Wavefront detecting again
The control matrix of device 12 is demarcated, and after the completion of calibration, then is controlled reflecting mirror 22 and Calibrating source 21 by wavefront controller 13 and is cut
Out.
Specifically, in the present embodiment, referring to Figure 1, passed through by the first laser (linearly polarized light) that first laser device 1 issues
It crosses the first beam expander 2 to expand to the bore to match with distorting lens 4, dichronic mirror 3 is transmitted through, then in turn through distorting lens
4, polarization spectroscope 5, quarter-wave plate 7 (linearly polarized light is converted to circularly polarized light herein) and third beam expander 7, transmitting is extremely
Free space is assembled in the sodium layer at ground about 92km and the sodium atom at this is excited to issue resonance light scattering；By second
The second laser (linearly polarized light) that laser 8 issues is reflected after beam expander expands by polarization spectroscope 5, and is successively passed through
Quarter-wave plate 7 (linearly polarized light is converted into circularly polarized light herein) and third beam expander 7, transmitting to free space, away from
It is assembled at the atmosphere of about 15km from the ground, and issues rear orientation light (i.e. Returning beam) after acting on atmospheric molecule.It returns
Light beam first passes around 7 compression diameter of third beam expander, and circularly polarized light is then converted to linear polarization by quarter-wave plate 7
Light, and polarization direction is vertical with former polarization direction, then is transmitted through polarization spectroscope 5 and successively passes through distorting lens 4, dichronic mirror 3
Reflection reach Wavefront detecting and control system 17.
Return light is compressed to by shrink beam device 10 can be inputted unanimously with transmission optics switch 11 and with wave front detector 12 first
Bore, optical switch 11 is controlled optionally through Returning beam, wave front detector by delayer 15 and high-voltage drive 16
12 pairs of Returning beams through optical switch 11 measure, and acquire the wavefront phase information of Returning beam, wavefront controller 13
Acquisition wavefront phase information simultaneously resolves corresponding control voltage, and control voltage controls distorting lens 4 after the amplification of high-voltage amplifier 14
The face shape opposite with current wavefront is generated, to offset the wavefront of Returning beam.In 13 work of wave front detector 12 and wavefront controller
Before work, Fig. 4 is referred to, wavefront controller 13 controls reflecting mirror 22 and cuts optical path with -45 degree angles, and Calibrating source 21 is accessed light
Road, to demarcate the control matrix of wavefront controller 13, after calibration, wavefront controller 13 controls reflecting mirror 22 and Calibrating source
21 cut out optical path.According to light path principle, the first laser that first laser beam-expanding system 18 issues carries after distorting lens 4
Corresponding wavefront compensation, and by being corrected in time when atmospheric turbulance, with relatively flat wavefront phase when reaching sodium layer
Bit distribution, improves the encircled energy of focused light spot, to reduce the angular breadth distribution of Sodium guide star and improve its brightness.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of Sodium guide star atmospheric laser link compensation system, which is characterized in that the system includes:
First laser beam-expanding system, dichronic mirror, distorting lens and the conjunction beam beam-expanding system of setting, position are arranged successively along transmitting optical path
In Wavefront detecting and control system, the in the conjunction beam beam-expanding system incident direction on the dichroic mirror direction
Dual-laser beam-expanding system and reflecting mirror and Calibrating source between the distorting lens and the conjunction beam beam-expanding system, it is described
Reflecting mirror is used to cut the Calibrating source/cut out optical path；
The first laser beam-expanding system is for emitting first laser and carrying out collimator and extender to the first laser；Described second
Laser beam expanding system is for emitting second laser and carrying out collimator and extender to the second laser；The Wavefront detecting and control system
System includes wave front detector and wavefront controller, and the wave front detector is for measuring Wave-front phase distributed intelligence, the wavefront
Controller is for control signal needed for handling the Wave-front phase distributed intelligence and exporting the distorting lens；
The first laser that the first laser beam-expanding system issues successively passes through the dichronic mirror, the distorting lens, the conjunction beam
Beam-expanding system emits to free space and assembles at sodium layer, and the second laser that the second laser beam-expanding system issues passes through institute
It states transmitting after closing beam beam-expanding system and assembles generation Returning beam to free space and at atmosphere, Returning beam successively passes through institute
It states and enters the Wavefront detecting and control system after closing beam beam-expanding system, the distorting lens, the dichronic mirror, visited in the wavefront
It surveys before device and wavefront controller work, the wavefront controller controls the reflecting mirror and the Calibrating source is cut light
Road, to demarcate the control matrix of the wavefront controller, after calibration, the wavefront controller controls the reflecting mirror for institute
It states Calibrating source and cuts out optical path, the Wave-front phase distributed intelligence of the wave front detector measurement Returning beam, the wavefront control
Control signal needed for device handles the Wave-front phase distributed intelligence and exports the distorting lens, control the distorting lens generate with
The opposite face shape of current wavefront is passed through to realize by the first laser that first laser device issues with offsetting the wavefront of Returning beam
It is pre-compensated for before crossing the laggard traveling wave of the distorting lens.
2. Sodium guide star atmospheric laser link compensation system according to claim 1, which is characterized in that the first laser expands
Beam system includes the first laser device being arranged successively and the first beam expander, and the first laser is collimated by the first beam expander
Enter the dichronic mirror after expanding.
3. Sodium guide star atmospheric laser link compensation system according to claim 1, which is characterized in that the second laser expands
Beam system includes the second laser being arranged successively and the second beam expander, and the second laser is collimated by the second beam expander
Enter the conjunction beam beam-expanding system after expanding.
4. Sodium guide star atmospheric laser link compensation system according to claim 1, which is characterized in that the first laser
The linear polarization of linear polarization and the second laser is mutually perpendicular to.
5. Sodium guide star atmospheric laser link compensation system according to claim 1, which is characterized in that the conjunction beam, which expands, is
System includes: the polarization spectroscope being arranged successively, quarter-wave plate and third beam expander, and the first laser is from the distorting lens
After outgoing successively after the polarization spectroscope, the quarter-wave plate and the third beam expander, transmitting to free sky
Between and at sodium layer assemble, the second laser from the second laser beam-expanding system outgoing after successively pass through the polarization spectro
After mirror, the quarter-wave plate and the third beam expander, transmitting is assembled to free space and at atmosphere.
6. Sodium guide star atmospheric laser link compensation system according to claim 1, which is characterized in that the Wavefront detecting and
Control system further include: shrink beam device, optical switch, high-voltage amplifier, delayer and high-voltage drive, the shrink beam device will come from
The Returning beam shrink beam of the dichronic mirror to transmiting the optical switch and input consistent bore with the wave front detector, and
The optical switch is controlled optionally through Returning beam, the Wavefront detecting by the delayer and the high-voltage drive
Device measures the Wave-front phase distributed intelligence of the Returning beam by the optical switch, and the wavefront controller acquires the wavefront
Phase distribution information simultaneously resolves control voltage, and the high-voltage amplifier controls the distorting lens generation after amplifying the control voltage
The face shape opposite with current wavefront.
7. the Sodium guide star atmospheric laser link compensation system according to claim 3 or 6, which is characterized in that the delayer
It is communicated to connect with the second laser, the delayer controls the optical switch according to the second laser synchronization signal
Operating status.
8. Sodium guide star atmospheric laser link compensation system according to claim 1, which is characterized in that the first laser is
Sodium laser, the second laser are different from the wavelength of the first laser.
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| CN111510222A (en) * | 2020-03-25 | 2020-08-07 | 哈尔滨工业大学 | Atmospheric turbulence pre-compensation device for unmanned aerial vehicle and ground laser communication |
| CN111855544A (en) * | 2020-07-31 | 2020-10-30 | 洹仪科技(上海)有限公司 | Fluorescence imaging device and imaging method thereof |
| CN111964795A (en) * | 2020-09-15 | 2020-11-20 | 北京大学 | Wavefront detection error measuring system and error measuring method thereof |
| CN111964795B (en) * | 2020-09-15 | 2022-04-26 | 北京大学 | Wavefront detection error measuring system and error measuring method thereof |
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