CN114720402A - Calibration device for composite sensing passive cavity - Google Patents
Calibration device for composite sensing passive cavity Download PDFInfo
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- CN114720402A CN114720402A CN202210328907.5A CN202210328907A CN114720402A CN 114720402 A CN114720402 A CN 114720402A CN 202210328907 A CN202210328907 A CN 202210328907A CN 114720402 A CN114720402 A CN 114720402A
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- 239000002131 composite material Substances 0.000 title claims abstract description 38
- 230000003287 optical effect Effects 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 34
- 230000005540 biological transmission Effects 0.000 claims abstract description 26
- 230000003595 spectral effect Effects 0.000 claims description 20
- 239000013307 optical fiber Substances 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 238000000411 transmission spectrum Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
- G01N21/474—Details of optical heads therefor, e.g. using optical fibres
Abstract
The invention discloses a composite sensing passive cavity calibration device which comprises an indicating light source (1), a plane cavity mirror (2), a first plano-concave cavity mirror (3), a spectroscope (4), a photoelectric detector (5), a spectrometer (6), a second plano-concave cavity mirror (7), a wavefront sensor (8) and a computer (9); the plane cavity mirror (2), the first plano-concave cavity mirror (3) and the second plano-concave cavity mirror (7) form a passive cavity, the photoelectric detector (5) records the light intensity of a transmission signal of the indicating light source (1) after passing through the passive cavity, the spectrometer (6) records a transmission spectrum line and a line width, and the wavefront sensor (8) records the phase and the light intensity distribution of a transmission light beam. And a certain weight is respectively given to each optical parameter of the transmitted light beam to construct a feedback index of the composite sensing cavity adjustment, so as to guide the cavity adjustment process of the passive cavity and finish the calibration of the passive cavity. The invention does not depend on subjective judgment of operators and can realize high-stability and high-precision calibration of the passive cavity.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a composite sensing passive cavity calibration device.
Background
The passive cavity is an optical resonant cavity without a gain working medium or without considering the gain of the working medium, and has important application value in the fields of cavity ring-down technology, optical fiber sensing technology, large laser system and the like at present. And the precise adjustment and calibration of the passive cavity have important significance for the application in the related technical field. Taking high reflectivity measurement in cavity ring-down technology as an example, the fine tuning of the passive cavity is extremely important to the authenticity and reliability of the measurement result. In the field of cavity ring-down technology and in the process of adjusting some optical resonant cavities, the adjustment and calibration of passive cavities are completed by introducing an indicating light beam and taking characteristic optical parameter information of a transmitted light beam as feedback. The characteristic information of the transmitted light field considered in the passive cavity adjustment process at the present stage is more limited or even single, such as the transmitted signal intensity (d.anderson, j.frisch, c.mask, Mirror-reflective based on optical cavity capture time, Applied Optics,1984,23(8), 1238-1245; chinese patent application No. 200810055635.4, "a device for measuring high reflectivity"), the ring-down curve of the transmitted light intensity (easy heny yog; waveform simulation under ring-down cavity disorder, chinese laser 2006, 33 (3): 399-. However, the cavity adjusting feedback information degree is limited, and the fine adjustment process needs to be adjusted and optimized manually and repeatedly, so that the cavity adjusting experience threshold is higher, the cavity adjusting efficiency is lower, the cavity adjusting repeatability precision is poorer, and the application effect in the actual technology is influenced.
Aiming at the problem, the invention records each optical parameter of the transmitted light beam after the indicating light beam passes through the passive cavity by composite sensing, wherein each optical parameter comprises a light intensity peak value, a phase position, light intensity distribution, a spectral line and a spectral line width, and each optical parameter is given with certain weight to construct a feedback index of a composite sensing cavity adjusting, and the feedback index can be used for carrying out a multidimensional analysis cavity adjusting process, guiding the cavity adjusting process of the passive cavity and completing the calibration of the passive cavity. Compared with the traditional method, the method can more comprehensively obtain the light field response characteristic of the passive cavity to the input light beam (indicating light beam), has more cavity-adjusting feedback indexes, does not depend on the subjective judgment of operators, avoids the local optimization phenomenon in the passive cavity adjusting process, achieves the optimized passive cavity state, and further realizes the high-stability and high-precision calibration of the passive cavity.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problems of limited cavity adjusting feedback information degree, poor cavity adjusting feedback sensitivity and the like exist in the process of adjusting the cavity of the passive cavity at present, so that the current cavity adjusting experience threshold is higher, the efficiency of the cavity adjusting process is lower, the repeatability and precision of the cavity adjusting are poorer, and the like, and a series of technical challenges are brought in engineering application.
The technical scheme adopted by the invention to solve the technical problem is as follows: a composite sensing passive cavity calibration device comprises: the device comprises an indicating light source, a plane cavity mirror, a first planoconcave mirror, a spectroscope, a photoelectric detector, a spectrometer, a second planoconcave mirror, a wave-front sensor and a computer; the laser beam output by the indicating light source is injected into a folding passive cavity formed by a plane cavity mirror, a first plane concave cavity mirror and a second plane concave cavity mirror for resonance, the transmission signal light intensity of the laser beam after passing through the passive cavity is collected by a photoelectric detector, the spectrum information of the transmission beam after being split by the spectroscope is recorded by a spectrometer and comprises a spectral line and a spectral line width, the phase and the light intensity distribution of the transmission beam are recorded by a wavefront detector, a composite sensing cavity-adjusting feedback index is constructed by respectively giving certain weights to each optical parameter of the transmission beam, the cavity-adjusting process of the passive cavity is guided, and the calibration of the passive cavity is completed. The computer is used as a data processor to control the switch and the power adjustment of the indicating light source, display the output signal of the optical cavity collected by the photoelectric detector, analyze and process the spectral information collected by the spectrometer, and display and analyze the phase and the light intensity distribution of the transmitted light beam recorded by the wavefront sensor.
Further, the indicating light source is a laser beam, and the beam aperture, the wavelength and the beam intensity are not particularly required, and may be defined as a laser beam with a particular wavelength, a particular aperture and a particular intensity.
Furthermore, the passive cavity formed by the plane cavity mirror, the first plane concave cavity mirror and the second plane concave cavity mirror is a folding passive resonance stable cavity.
Furthermore, each optical parameter of the transmitted light beam comprises a light intensity peak value, a phase, a light intensity distribution, a spectral line and a spectral line width.
Furthermore, the weight of each optical parameter in the construction process of the composite sensing cavity-adjusting feedback index can be set according to theory, simulation model, prior knowledge or experimental conditions; the weights of the optical parameters can be dynamically adjusted in the cavity adjusting process.
Further, the composite sensing cavity-adjusting feedback index guides the cavity-adjusting process of the passive cavity, specifically, the composite sensing cavity-adjusting feedback index can be used as an auxiliary judgment basis for manual cavity adjustment and also can be used as a control feedback quantity for automatic cavity adjustment.
Furthermore, the condition for completing the calibration of the passive cavity is set according to the specific application scene of the passive cavity, and comprises a cavity ring-down system, an optical fiber sensing system and a large-scale laser system.
The principle of the invention is as follows: by obtaining the light field response characteristic of the passive cavity to the cavity modulation indicating light beam, more cavity modulation analysis dimensions are provided, a composite sensing cavity modulation feedback index is formed, the cavity modulation process is guided more comprehensively, and the calibration of the passive cavity is realized.
Compared with the prior art, the invention has the following advantages: the method can more comprehensively obtain the light field response characteristic of the passive cavity to the input light beam (indicating light beam), has more cavity-adjusting feedback indexes, does not depend on the subjective judgment of operators, has lower cavity-adjusting experience threshold and higher cavity-adjusting repeatability precision, can overcome the problem of local optimization in the adjustment process of the passive cavity, achieves the optimized passive cavity state, and further can realize the high-stability and high-precision calibration of the passive cavity.
Drawings
Fig. 1 is a schematic structural diagram of a composite sensing passive cavity calibration device of the present invention, wherein 1 is an indicating light source; 2 is a plane cavity mirror; 3 is a first plano-concave mirror; 4 is a spectroscope; 5 is a photoelectric detector; 6 is a spectrometer; 7 is a second plano-concave mirror; 8 is a wavefront sensor; 9 is a computer;
fig. 2 is a cavity adjusting flow chart of the composite sensing passive cavity calibration device of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1, a calibration apparatus for a composite sensing passive cavity includes: the device comprises an indicating light source 1, a plane cavity mirror 2, a first concave cavity mirror 3, a spectroscope 4, a photoelectric detector 5, a spectrometer 6, a second concave cavity mirror 7, a wavefront sensor 8 and a computer 9; the laser beam output by the indicating light source 1 is injected into a folding passive cavity formed by a plane cavity mirror 2, a first plane concave cavity mirror 3 and a second plane concave cavity mirror 7 for resonance, the light intensity of a transmission signal of the laser beam passing through the passive cavity is collected by a photoelectric detector 5, the spectrum information of the transmission beam is recorded by a spectrometer 6 after the transmission beam is split by a spectroscope 4, the spectrum information comprises a spectral line and a spectral line width, and the phase and the light intensity distribution of the transmission beam are recorded by a wavefront detector 8. And a certain weight is respectively given to each optical parameter of the transmitted light beam to construct a composite sensing cavity-tuning feedback index, so as to guide the cavity-tuning process of the passive cavity and finish the calibration of the passive cavity. The computer 9 is used as a data processor to control the switching and power adjustment of the indicating light source 1, display the output signal of the optical cavity acquired by the photoelectric detector 5, analyze and process the spectral information acquired by the spectrometer 6, and display and analyze the phase and light intensity distribution of the transmitted light beam recorded by the wavefront sensor 8. The indicating light source 1 is a laser beam, and the beam aperture, the wavelength and the beam intensity are not specifically required, and can be defined as a laser beam with a specific wavelength, a specific aperture and a specific intensity. The passive cavity formed by the plane cavity mirror 2, the first plane concave cavity mirror 3 and the second plane concave cavity mirror 7 is a folding passive resonance stable cavity. The optical parameters of the transmitted light beam include light intensity peak value, phase, light intensity distribution, spectral line and spectral line width. The weight of each optical parameter in the construction process of the feedback index of the composite sensing cavity can be set according to theory, simulation model, prior knowledge or experimental conditions; the weights of the optical parameters can be dynamically adjusted in the cavity adjusting process. The composite sensing cavity-adjusting feedback index guides the cavity-adjusting process of the passive cavity, and particularly means that the composite sensing cavity-adjusting feedback index can be used as an auxiliary judgment basis for manual cavity adjustment and can also be used as a control feedback quantity for automatic cavity adjustment. The condition for completing calibration of the passive cavity is set according to the specific application scene of the passive cavity, and comprises an optical cavity ring-down system, an optical fiber sensing system and a large laser system.
The composite sensing passive cavity calibration device provided by the embodiment of the invention is characterized in that a laser beam output by an indicating light source 1 is injected into a folded passive cavity formed by a plane cavity mirror 2, a first plane concave cavity mirror 3 and a second plane concave cavity mirror 7 for resonance, the light intensity of a transmission signal of the laser beam passing through the passive cavity is collected by a photoelectric detector 5, the spectrum information of the transmission beam is recorded by a spectrometer 6 after the transmission beam is split by a beam splitter 4 and comprises a spectral line and a spectral line width, and the phase and the light intensity distribution of the transmission beam are recorded by a wavefront detector 8. And a certain weight is respectively given to each optical parameter of the transmitted light beam to construct a composite sensing cavity-tuning feedback index, so as to guide the cavity-tuning process of the passive cavity and finish the calibration of the passive cavity.
The indicator light source 1 in fig. 1 is in this embodiment a continuous semiconductor laser (RGB Photonics) with a central wavelength of 1064nm, a nominal line width of 0.5nm, an output of 1mW and a diameter of ≤ 5 mm.
The photodetector 5, spectrometer 6 and wavefront sensor 8 in fig. 1 record the transmitted signal light intensity, the transmitted wavelength linewidth, the phase of the transmitted beam and the light intensity distribution, respectively. The four optical parameters are fused to construct a composite sensing cavity modulation feedback index to guide the cavity modulation calibration process of the passive cavity.
The cavity adjusting method of the composite sensing passive cavity calibration device specifically comprises the following steps:
and step 4, dynamically adjusting the weight of each optical parameter according to the requirement to continuously adjust the cavity.
Fig. 2 is a cavity adjusting flow chart of the composite sensing passive cavity calibration device of the present invention. The specific process in the embodiment is to set up a folding passive stable resonant cavity, introduce a fundamental transverse mode laser beam with a central wavelength of 1064nm, a nominal line width of 0.5nm, an output power of 1mW and a diameter of less than or equal to 5mm into the cavity, obtain multidimensional optical parameters of a transmission beam of the passive cavity through a photoelectric detector 5, a wavefront sensor 8 and a spectrometer 6, wherein the multidimensional optical parameters comprise transmission signal light intensity, transmission light intensity distribution, a transmission light field phase and a transmission spectrum wavelength line width, fuse the four optical parameters to form a composite sensing cavity-tuning feedback index, guide the cavity-tuning process of the passive cavity, dynamically adjust the weight of each optical parameter according to needs in the cavity-tuning process, and continue to tune the cavity, so as to complete the calibration of the passive cavity.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can understand that the modifications or substitutions within the technical scope of the present invention are included in the scope of the present invention.
Claims (7)
1. A calibration device for a composite sensing passive cavity is characterized by comprising: the device comprises an indicating light source (1), a plane cavity mirror (2), a first plano-concave mirror (3), a spectroscope (4), a photoelectric detector (5), a spectrometer (6), a second plano-concave mirror (7), a wave front sensor (8) and a computer (9); a laser beam output by an indicating light source (1) is injected into a folding passive cavity formed by a plane cavity mirror (2), a first plano-concave cavity mirror (3) and a second plano-concave cavity mirror (7) for resonance, the light intensity of a transmission signal of the laser beam passing through the passive cavity is collected by a photoelectric detector (5), the spectral information of the transmission beam after being split by a beam splitter (4) is recorded by a spectrometer (6) and comprises spectral lines and spectral line widths, the phase and the light intensity distribution of the transmission beam are recorded by a wavefront detector (8), a composite sensing cavity-adjusting feedback index is constructed by respectively giving certain weight to each optical parameter of the transmission beam to guide the cavity-adjusting process of the passive cavity, the calibration of the passive cavity is completed, a computer (9) is used as a data processor, the switching and the power adjustment of the indicating light source (1) are controlled, and the output signal of the optical cavity collected by the photoelectric detector (5) is displayed, and the spectral information collected by the spectrometer (6) is analyzed and processed, and the phase and the light intensity distribution of the transmitted light beam recorded by the wavefront sensor (8) are displayed and analyzed.
2. The composite sensing passive cavity calibration device according to claim 1, wherein: the indicating light source (1) is a laser beam, and the beam aperture, the wavelength and the beam intensity do not have specific requirements, and can be limited to the laser beam with specific wavelength, specific aperture and specific intensity.
3. The composite sensing passive cavity calibration device according to claim 1, wherein: the passive cavity formed by the plane cavity mirror (2), the first plano-concave cavity mirror (3) and the second plano-concave cavity mirror (7) is a folding passive resonance stable cavity.
4. The composite sensing passive cavity calibration device according to claim 1, wherein: the optical parameters of the transmitted light beam include light intensity peak value, phase, light intensity distribution, spectral line and spectral line width.
5. The composite sensing passive cavity calibration device according to claim 1, wherein: the weight of each optical parameter in the construction process of the composite sensing cavity-adjusting feedback index can be set according to theory, simulation model, prior knowledge or experimental conditions; the weights of the optical parameters can be dynamically adjusted in the cavity adjusting process.
6. The composite sensing passive cavity calibration device according to claim 1, characterized in that: the composite sensing cavity-adjusting feedback index guides the cavity-adjusting process of the passive cavity, and particularly means that the composite sensing cavity-adjusting feedback index can be used as an auxiliary judgment basis for manual cavity adjustment and can also be used as a control feedback quantity for automatic cavity adjustment.
7. The composite sensing passive cavity calibration device according to claim 1, wherein: the condition for completing calibration of the passive cavity is set according to the specific application scene of the passive cavity, and comprises an optical cavity ring-down system, an optical fiber sensing system and a large laser system.
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