CN107655659B - Laser communication terminal vacuum test system and test method thereof - Google Patents
Laser communication terminal vacuum test system and test method thereof Download PDFInfo
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- CN107655659B CN107655659B CN201710861450.3A CN201710861450A CN107655659B CN 107655659 B CN107655659 B CN 107655659B CN 201710861450 A CN201710861450 A CN 201710861450A CN 107655659 B CN107655659 B CN 107655659B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- H—ELECTRICITY
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
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Abstract
The invention relates to a vacuum test system of a laser communication terminal and a test method thereof, comprising a divergence angle test system, a power test system and a wave phase difference test system; adjusting the laser communication terminal to enable the laser communication terminal to point to and align with the collimator; the collimator receives the light beam emitted by the laser communication terminal, and converges and images the light beam on a photoelectric coupler of the divergence angle testing module; the laser communication terminal is adjusted to enable the laser communication terminal to emit light beams coaxial with the beam shrinking system, the emitted light beams form beam shrinking parallel light beams after passing through the beam shrinking system, the beam shrinking parallel light beams are split by the first spectroscope and are respectively transmitted to the power meter and the second spectroscope, and the second spectroscope splits the light beams again and then receives the light beams by the first Hartmann wavefront sensor and the second Hartmann wavefront sensor. The thermal vacuum test of the single-ended laser communication terminal can be completed, the stability of the laser communication terminal in the vacuum high-low temperature process is verified, and the thermal vacuum test system is an essential test system in the thermal vacuum test process of the laser communication terminal.
Description
Technical Field
The invention belongs to the field of optical detection, relates to a laser communication terminal vacuum test system and a test method thereof, and particularly relates to a test system and a measurement method thereof for parameters such as divergence angle, wave phase difference, emission power and the like under a space laser communication terminal vacuum condition.
Background
Compared with the traditional microwave space communication mode, the laser communication, in particular to the space laser communication, has the advantages of high speed, confidentiality, interference resistance, light weight, small size and the like. With the development of space remote sensing technology, various payloads acquire a large amount of space detection data, and the data needs to be transmitted to the ground in real time for analysis by related technicians. The bandwidth of the microwave commonly used on the satellite at present is about hundred megabytes, the theoretical limit of microwave communication is approached, the transmission rate of the actual fiber laser communication is as high as 40G/s, the actual fiber laser communication is practically applied at present, the higher transmission rate can be realized by utilizing the optical amplification technologies such as the intensive optical wave recovery technology (Densewavelength Division Multiplexing, DWDM) and the like, and the fiber laser communication system of the hundred gigabytes on the ground is commercialized, so that the data transmission pressure is greatly reduced by adopting the laser for communication. With the successful experiment of 5.65G/s space laser communication terminals (Laser Communication Terminal, LCT), tens of gigabit rate space LCT in foreign countries is also under study and planning, which fully proves the advantages in practical application of laser communication, so that the bottleneck problem of communication bandwidth can be well solved by using laser as medium for communication.
As a payload, the spatial laser communication system is subjected to strict testing of its main technical specifications, both after development and before transmission. Under the thermal vacuum environment, the key indexes of the space laser communication system are examined, and become important in the environment test of the space laser communication system.
Because at least one terminal side is required to be completed when the space laser communication terminal transmits information, and a test system required by the double-terminal butt joint information transmission test is very complex, the difficulty of completing the double-terminal butt joint test in a thermal vacuum test is very high, and therefore, the key indexes of the single-terminal space laser communication terminal are tested under the vacuum condition.
The key indexes of the single-end laser communication terminal comprise wave phase difference, divergence angle and emission power, and how to finish the measurement of the three indexes under the thermal vacuum condition is a difficult problem for verifying the thermal vacuum stability of the single-end laser communication terminal.
Disclosure of Invention
The invention aims to provide a laser communication terminal vacuum test system and a test method thereof, which realize the test of key indexes such as wave phase difference, divergence angle, emission power and the like of a single-ended laser communication terminal under the condition of thermal vacuum.
The technical scheme of the invention is to provide a laser communication terminal vacuum test system, which is characterized in that: the device comprises a divergence angle test system, a power test system and a wave phase difference test system;
the emission angle of the laser communication terminal can be adjusted;
the divergence angle testing system comprises a collimator 1 and a divergence angle testing module 2 which are sequentially arranged along one path of emergent light path of the laser communication terminal; the divergence angle testing module 2 comprises a three-dimensional translation stage and a photoelectric coupler arranged on the three-dimensional translation stage;
the laser communication terminal emits a light beam coaxial with the collimator 1; the collimator 1 receives light beams emitted by a laser communication terminal, and converges and images the light beams on a photoelectric coupler of the divergence angle testing module 2;
the laser communication terminal and the collimator 1 are positioned in a vacuum environment;
the power test system comprises a beam shrinking system 6, a first spectroscope 8 and a power meter 12, wherein the beam shrinking system 6, the first spectroscope 8 and the power meter 12 are sequentially arranged along the other path of emergent light path of the laser communication terminal;
the wave phase difference testing system comprises a second spectroscope 9 positioned in the other path of the emergent light path of the first spectroscope 8, a second Hartmann wavefront sensor 11 and a first Hartmann wavefront sensor 10 respectively positioned in the emergent light paths of the second spectroscope 9;
the laser communication terminal emits a light beam coaxial with the beam shrinking system 6, the emitted light beam forms a beam shrinking parallel light beam after passing through the beam shrinking system 6, the beam shrinking parallel light beam is split by the first spectroscope 8 and is respectively transmitted to the power meter 12 and the second spectroscope 9, and the second spectroscope 9 splits the light beam again and then receives the light beam by the first Hartmann wavefront sensor 10 and the second Hartmann wavefront sensor 11.
Preferably, the testing system further comprises a vacuum tank 3 with an optical window 5, the laser communication terminal 4 is positioned in the vacuum tank 3, and the emergent light of the laser communication terminal is incident to the beam shrinking system 6 through the optical window 5;
the collimator 1 is fixedly connected with the vacuum tank 3, and the collimator 1 and the vacuum tank 3 form a closed vacuum space in which a vacuum environment can be simulated.
Preferably, in order to improve the measurement accuracy of the divergence angle, the collimator 1 is a long-focal-length off-axis parabolic reflective collimator. Collimator with a focal length greater than 10m is generally considered to be a long focal length collimator.
Preferably, the light sensing surface of the divergence angle test module 2 is located at the focal plane of the collimator 1.
Preferably, the photosensitive device in the divergence angle test module 2 includes at least one CCD or CMOS device having a spectral range of 800nm to 1600 nm; the divergence angle test module 2 further comprises an attenuation sheet group positioned at the front end of the photosensitive device, and energy entering the photosensitive device is adjusted by adding the attenuation sheet groups with different attenuation multiplying powers.
Preferably, the beam shrinking system 6 is composed of an off-axis parabolic mirror and an ocular lens 7 which are sequentially arranged along the light path, and the calculation formula of the beam shrinking multiplying power Γ is shown as formula (1);
wherein: l is the exit pupil diameter of the laser communication terminal 4;
a is the inscribed circle diameter of the target surfaces of the two Hartmann wavefront sensors.
Preferably, the characteristic wavelengths of the first Hartmann wavefront sensor 10 and the second Hartmann wavefront sensor 11 described above match the characteristic wavelengths of the spatial laser communication.
Preferably, the vacuum tank 3 has a diameter of 3m and a length of 5m, and the internal vacuum degree can reach 1×10 -6 Pa；
The optical window 5 is a window with diameter phi of 500mm, and the window glass is made of quartz or microcrystal;
the collimator 1 is an off-axis parabolic reflective collimator with a focal length of 30m and an aperture of phi 1 m;
the characteristic wavelength of the first Hartmann wavefront sensor 10 is 808nm and 830nm, and the characteristic wavelength of the second Hartmann wavefront sensor 11 is 1541nm and 1550nm;
the off-axis parabolic mirror of the beam shrinking system 6 is a phi 250mm off-axis parabolic mirror;
the above parameters are not limited to only the data given.
Preferably, the power meter 12 is an integrating sphere type power meter 12, and has a wavelength response range of 800nm to 1700nm and a dynamic range of 0.01W to 10W.
The invention also provides a laser communication terminal vacuum test method based on the laser communication terminal vacuum test system, which comprises the following steps:
step one: the vacuum tank and the collimator tube are vacuumized simultaneously, and the vacuum degree reaches 1X 10 -5 After Pa is less, starting performance test of the laser communication terminal;
step two: adjusting the laser communication terminal to enable the laser communication terminal to point to and align with the collimator;
step three: selecting an attenuation sheet group, loading the attenuation sheet group into a divergence angle test module, and opening a laser communication terminal to emit laser beams;
step four: the divergence angle testing module adjusts exposure time according to the formed facula image;
step five: six images are continuously collected by the divergence angle testing module, and the diameter D of a light spot corresponding to different images is calculated i Calculating the focal plane according to formula (2)Diameter of light spotCalculating divergence angles theta corresponding to different wavelengths according to a formula (3) in mm and rad;
step six: adjusting the angle of the laser communication terminal to enable the laser communication terminal to point to and be aligned with the beam shrinking system;
step seven: selecting two attenuation sheet groups, respectively loading the attenuation sheet groups into the front ends of a first Hartmann wavefront sensor and a second Hartmann wavefront sensor, and opening a laser communication terminal to emit laser beams;
step eight: the power meter measures the emergent power P 2 Calculating the emitted light power P of the laser communication terminal according to the formula (4) 1 ；
Wherein τ 1 Is the transmittance of the beam shrinking system; τ 2 Is the reflectivity of the first spectroscope;
step nine: the first Hartmann wavefront sensor receives 808nm laser, the emergent beam wave phase difference is obtained by adjusting the gesture of the first Hartmann wavefront sensor, the second Hartmann wavefront sensor receives 1541nm laser, and the emergent beam wave phase difference is obtained by adjusting the gesture of the second Hartmann wavefront sensor.
The beneficial effects of the invention are as follows:
1. the invention can complete the thermal vacuum test of the single-ended laser communication terminal, verify the stability of the laser communication terminal in the vacuum high-low temperature process, and is an essential test system in the thermal vacuum test process of the laser communication terminal;
2. the laser communication terminal vacuum test system uses two paths of light splitting, can simultaneously acquire the wave phase difference and the transmitting power of the laser communication terminal, has stable and reliable test process, can greatly improve the test efficiency, is very suitable for being applied to engineering tests, and has the advantages that the tested modules are all arranged outside a vacuum environment, the subsequent expansion of other index tests is convenient, and the modified function is very strong;
3. according to the invention, the divergence angle is measured by using the long-focal-length collimator, and the divergence angle of the laser communication terminal is measured in a micro-arc measurement stage, so that the measurement accuracy of the divergence angle can be greatly improved;
4. the invention uses the design of the beam shrinking system and the spectroscope, can simultaneously measure the wave phase difference of two wavelengths of the laser communication terminal, can realize the simultaneous measurement of the wave phase difference and the output power of the laser communication terminal, has stable system structure and high repeatability, and meets the test requirement of a thermal vacuum test.
Drawings
Fig. 1 is a schematic structural diagram of a divergence angle test module of a vacuum test system of a laser communication terminal provided by the invention;
FIG. 2 is a schematic diagram of a laser communication terminal vacuum test system wave phase difference and emitted light power test module according to the present invention;
FIG. 3 is an enlarged view of a laser communication terminal vacuum test system wave phase difference and emitted light power test module provided by the invention;
in the figure: 1-a collimator; a 2-divergence angle test module; 3-a vacuum tank; 4-a laser communication terminal; 5-an optical window; 6-beam shrinking system; 7-ocular; 8-a first spectroscope; 9-a second beam splitter; 10-a first hartmann wavefront sensor; 11-a second hartmann wavefront sensor; 12-power meter.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
As can be seen from fig. 1 and 2, the test system of the present embodiment includes a vacuum tank 3 for placing a laser communication terminal 4, the vacuum tank 3 has a size of 3m diameter and 5m length, and the internal vacuum degree can reach 1×10 -6 Pa；One side of the vacuum tank 3 is provided with a quartz or microcrystal optical window 5 which can transmit light, and the diameter of the optical window 5 is phi 500mm; wherein the outgoing light direction of the laser communication terminal 4 is adjustable.
The system also comprises a divergence angle test system, a power test system and a wave phase difference test system which are positioned in the emergent light path of the laser communication terminal 4.
The divergence angle test system comprises a collimator 1 and a divergence angle test module 2 which are arranged along an optical path, wherein the collimator 1 and a laser communication terminal 4 are arranged in the same closed space, and a vacuum environment can be simulated in the space; the divergence angle test module 2, the power test system and the wave phase difference test system are all positioned outside the vacuum environment, so that the position is conveniently adjusted; in the present embodiment, the collimator 1 is an off-axis parabolic reflective collimator 1 with a focal length of 30m and a diameter of Φ1m, and other embodiments are not limited to this parameter; the light sensitive surface of the divergence angle test module 2 is positioned at the focal plane of the collimator 1, the light sensitive device in the divergence angle test module 2 is a CCD or CMOS device, the spectrum range is 800 nm-1600 nm, the light sensitive device can be completed by one piece, and the requirements of the whole test spectrum range can be met by replacing devices in different wavelength ranges; the front end of the photosensitive device of the divergence angle module can be added with an attenuation sheet group, and the energy entering the photosensitive device is adjusted by adding the attenuation sheet groups with different attenuation multiplying powers.
The laser communication terminal 4 emits light beams coaxial with the collimator 1, the collimator 1 receives the light beams emitted by the laser communication terminal 4, and the light beams are focused and imaged on the divergence angle testing module 2.
The power test system includes a beam shrinking system 6, a first beam splitter 8 and a power meter 12, which are disposed along the optical path, in this embodiment, the power meter 12 is located in a reflection optical path of the first beam splitter 8, and in other embodiments, the power meter 12 may be located in a transmission optical path of the first beam splitter 8, as long as it is satisfied that the power meter 12 and the wave phase difference test system are located in different optical paths of the first beam splitter 8, respectively. The beam shrinking system 6 consists of an off-axis parabolic mirror with phi of 250mm and an ocular lens 7, and a calculation formula of the beam shrinking multiplying power gamma is shown as a formula (1);
wherein: l is the exit pupil diameter of the laser communication terminal 4; a is the target surface size of the Hartmann wavefront sensor;
the power meter 12 is an integrating sphere type power meter 12, the wavelength response range is 800-1700 nm, and the dynamic range is 0.01-10W;
the wave phase difference testing system comprises a second spectroscope 9 positioned in a transmission light path of the first spectroscope 8, a first Hartmann wavefront sensor 10 positioned in a transmission light path of the second spectroscope 9 and a second Hartmann wavefront sensor 11 positioned in a transmission light path of the second spectroscope 9, and the positions of the first Hartmann wavefront sensor 10 and the second Hartmann wavefront sensor 11 can be interchanged in other embodiments; the characteristic wavelength of the first Hartmann wave-front sensor 10 is 808nm and 830nm, and the characteristic wavelength of the second Hartmann wave-front sensor 11 is 1541nm and 1550nm; these wavelengths are characteristic wavelengths of spatial laser communication, but are not limited to these wavelengths;
after the azimuth angle of the laser communication terminal 4 is adjusted, the emission light beam is coaxial with the beam shrinking system 6, the emission light beam forms a beam shrinking parallel light beam after passing through the optical window 5 and the beam shrinking system 6, the beam shrinking parallel light beam is split by the first spectroscope 8 and is respectively transmitted to the power meter 12 and the second spectroscope 9, and the beam is respectively received by the first Hartmann wavefront sensor 10 and the second Hartmann wavefront sensor 11 after being split by the second spectroscope 9.
Meanwhile, the invention also provides a vacuum test method based on the laser communication terminal 4, which comprises the following steps:
1) The vacuum tank 3 and the collimator 1 are vacuumized simultaneously, and the vacuum degree reaches 1×10 -5 After Pa is less, starting performance test of the laser communication terminal;
2) The laser communication terminal 4 adjusts the pointing direction to be aligned with the collimator 1;
3) According to the previous calculation, a proper attenuation sheet is selected to be assembled into the divergence angle test module 2, and the laser communication terminal 4 is opened to emit laser beams;
4) The divergence angle test module 2 adjusts proper exposure time according to the formed facula image, and the imaged gray value is not more than 80% of the total quantization bit number;
5) Continuously collecting 6 images, and calculating the spot diameter D corresponding to different images according to a program i Calculated according to formula (2)The divergence angles theta of the different wavelengths are calculated by the formula (3).
Wherein: θ is the divergence angle of the signal light, unit: rad;
the unit is the diameter of the spot at the focal plane: mm;
6) The laser communication terminal 4 adjusts the pointing direction to be aligned with the beam shrinking system 6;
7) The front end of the Hartmann wavefront sensor is assembled by selecting a proper attenuation sheet according to the previous calculation, and the laser communication terminal 4 is opened to emit laser beams;
8) The power meter 12 measures the outgoing power P 2 Calculating the emitted light power P of the laser communication terminal 4 according to the formula (4) 1 ；
Wherein: p (P) 1 Transmitting optical power for the laser communication terminal 4;
P 2 for power meter 12, the measured emergent power;
τ 1 is the transmittance of the beam shrinking system 6; τ 2 Is the reflectivity of the first beam splitter 8;
9) The first Hartmann wavefront sensor 10 receives 808nm laser light, and the outgoing beam wave phase difference is obtained by adjusting the posture thereof, and the second Hartmann wavefront sensor 11 receives 1541nm laser light, and the outgoing beam wave phase difference is obtained by adjusting the posture thereof.
The laser communication terminal vacuum test system can meet the measurement of main optical parameters of a single-ended laser communication terminal, verify the stability of the laser communication terminal in the vacuum high-low temperature process, and is an essential test system in the laser communication terminal thermal vacuum test process.
The laser communication terminal vacuum test system uses two paths of light splitting, can simultaneously acquire the wave phase difference and the transmitting power of the laser communication terminal, has stable and reliable test process, can greatly improve the test efficiency, is very suitable for being applied to engineering tests, and is convenient for subsequent expansion of other index tests by placing the tested modules outside a vacuum environment.
According to the laser communication terminal vacuum test system, the collimator with a longer focal length is selected to finish the measurement of the divergence angle, so that the measurement accuracy of the divergence angle can be greatly improved.
Claims (10)
1. A laser communication terminal vacuum test system is characterized in that: the device comprises a divergence angle test system, a power test system and a wave phase difference test system;
the emission angle of the laser communication terminal can be adjusted;
the divergence angle testing system comprises a collimator (1) and a divergence angle testing module (2) which are sequentially arranged along one path of emergent light path of the laser communication terminal; the divergence angle testing module (2) comprises a three-dimensional translation stage and a photoelectric coupler arranged on the three-dimensional translation stage;
the laser communication terminal emits a light beam coaxial with the collimator (1); the collimator (1) receives light beams emitted by the laser communication terminal, and converges and images the light beams on a photoelectric coupler of the divergence angle testing module (2);
the laser communication terminal and the collimator (1) are positioned in a vacuum environment;
the power test system comprises a beam shrinking system (6), a first spectroscope (8) and a power meter (12) which are sequentially arranged along the other path of emergent light path of the laser communication terminal, wherein the power meter is positioned in one path of emergent light path of the first spectroscope (8);
the wave phase difference testing system comprises a second spectroscope (9) positioned in the other path of emergent light path of the first spectroscope (8), and a second Hartmann wavefront sensor (11) and a first Hartmann wavefront sensor (10) which are respectively positioned in the emergent light path of the second spectroscope (9);
the laser communication terminal emits light beams coaxial with the beam shrinking system (6), the emitted light beams form beam shrinking parallel light beams after passing through the beam shrinking system (6), the beam shrinking parallel light beams are split by the first spectroscope (8) and respectively transmitted to the power meter (12) and the second spectroscope (9), and the second spectroscope (9) splits the light beams again and then receives the light beams by the first Hartmann wavefront sensor (10) and the second Hartmann wavefront sensor (11).
2. The laser communication terminal vacuum test system according to claim 1, wherein: the laser communication terminal (4) is positioned in the vacuum tank (3), and emergent light of the laser communication terminal enters the beam shrinking system (6) through the optical window (5);
the collimator (1) is fixedly connected with the vacuum tank (3), and the collimator (1) and the vacuum tank (3) form a closed vacuum space.
3. The laser communication terminal vacuum test system according to claim 2, wherein: the collimator (1) is a long-focus off-axis parabolic reflective collimator.
4. A laser communication terminal vacuum test system according to claim 3, wherein: the light sensitive surface of the divergence angle testing module (2) is positioned at the focal plane of the collimator (1).
5. The laser communication terminal vacuum test system according to claim 4, wherein: the photosensitive device in the divergence angle test module (2) comprises at least one CCD or CMOS device with the spectral range of 800 nm-1600 nm; the divergence angle test module (2) further comprises an attenuation sheet group positioned at the front end of the photosensitive device, and energy entering the photosensitive device is adjusted by adding the attenuation sheet groups with different attenuation multiplying powers.
6. The laser communication terminal vacuum test system according to claim 5, wherein: the beam shrinking system (6) consists of an off-axis parabolic mirror and an ocular lens (7) which are sequentially arranged along a light path, and a calculation formula of the beam shrinking multiplying power gamma is shown as a formula (1);
wherein: l is the exit pupil diameter of the laser communication terminal (4);
a is the inscribed circle diameter of the target surfaces of the two Hartmann wavefront sensors.
7. The laser communication terminal vacuum test system of claim 6, wherein: the characteristic wavelengths of the first Hartmann wavefront sensor (10) and the second Hartmann wavefront sensor (11) are matched with the characteristic wavelengths of the spatial laser communication.
8. The laser communication terminal vacuum test system of claim 7, wherein:
the vacuum tank (3) has a diameter of 3m and a length of 5m, and the internal vacuum degree can reach 1 multiplied by 10 -6 Pa；
The optical window (5) is a window with diameter phi of 500mm, and the window glass is made of quartz or microcrystal;
the collimator (1) is an off-axis parabolic reflective collimator with a focal length of 30m and an aperture of phi 1 m;
the characteristic wavelength of the first Hartmann wavefront sensor (10) is 808nm and 830nm, and the characteristic wavelength of the second Hartmann wavefront sensor (11) is 1541nm and 1550nm;
the off-axis parabolic mirror of the beam shrinking system (6) is a phi 250mm off-axis parabolic mirror.
9. The laser communication terminal vacuum test system of claim 7, wherein: the power meter (12) is an integrating sphere type power meter, the wavelength response range is 800-1700 nm, and the dynamic range is 0.01-10W.
10. A laser communication terminal vacuum test method based on the laser communication terminal vacuum test system as claimed in any one of claims 1 to 9, comprising the steps of:
step one: the vacuum tank and the collimator tube are vacuumized simultaneously, and the vacuum degree reaches 1X 10 -5 After Pa is less, starting performance test of the laser communication terminal;
step two: adjusting the laser communication terminal to enable the laser communication terminal to point to and align with the collimator;
step three: selecting an attenuation sheet group, loading the attenuation sheet group into a divergence angle test module, and opening a laser communication terminal to emit laser beams;
step four: the divergence angle testing module adjusts exposure time according to the formed facula image;
step five: six images are continuously collected by the divergence angle testing module, and the diameter D of a light spot corresponding to different images is calculated i Calculating the diameter of the light spot at the focal plane according to the formula (2)Calculating divergence angles theta corresponding to different wavelengths according to a formula (3) in mm and rad;
step six: adjusting the angle of the laser communication terminal to enable the laser communication terminal to point to and be aligned with the beam shrinking system;
step seven: selecting two attenuation sheet groups, respectively loading the attenuation sheet groups into the front ends of a first Hartmann wavefront sensor and a second Hartmann wavefront sensor, and opening a laser communication terminal to emit laser beams;
step eight: the power meter measures the emergent power P 2 Calculating the emitted light power P of the laser communication terminal according to the formula (4) 1 ；
Wherein τ 1 Is the transmittance of the beam shrinking system; τ 2 Is the reflectivity of the first spectroscope;
step nine: the first Hartmann wavefront sensor receives 808nm laser, the emergent beam wave phase difference is obtained by adjusting the gesture of the first Hartmann wavefront sensor, the second Hartmann wavefront sensor receives 1541nm laser, and the emergent beam wave phase difference is obtained by adjusting the gesture of the second Hartmann wavefront sensor.
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