525 results about "Optical fiber coupler" patented technology

The invention discloses a PCB (printed circuit board) back drilling stub length detection device and method, and belongs to the technical field of PCB detection, the PCB back drilling stub length detection device comprises a broadband light source, the output end of the broadband light source is connected with an optical fiber coupler, and one end, deviating from the broadband light source, of the optical fiber coupler is respectively connected with a first optical fiber collimator and a second optical fiber collimator; the first optical fiber collimator is provided with a lens and a reflector on an optical transmission path; the second optical fiber collimator is provided with a galvanometer on a light transmission path, and a scanning lens is arranged in the light emitting direction of the galvanometer; and the optical fiber coupler is also connected with a spectrograph. On the basis of the low-coherence light interference principle, the PCB back drilling stub length detection device is designed, the output power and the output bandwidth of a broadband light source are correspondingly adjusted, the insertion loss of an optical fiber coupler is controlled, the collection rate of a spectrograph is adjusted, finally, the axial resolution reaches 5 micrometers, the transverse resolution reaches 10 micrometers, and the requirements that the diameter is smaller than 0.1 mm, and the detection precision is larger than 0.1 mm can be met. And detecting the stub length of the deep micropore with the depth of less than 10mm.

The invention provides an OFDR sensing system and method for rapidly positioning strain based on a time domain difference algorithm, and relates to the technical field of optical fiber sensing. The OFDR sensing system comprises a narrow linewidth tunable laser light source, a first optical fiber coupler, a main interferometer, an auxiliary interferometer and a data acquisition and signal processing module; laser emitted by the narrow linewidth tunable laser light source is divided into two paths through the first optical fiber coupler, one path of light enters the main interferometer, and the other path of light enters the auxiliary interferometer; the main interferometer and the auxiliary interferometer respectively output a main interferometer optical signal and an auxiliary interferometer optical signal to the data acquisition and signal processing module; the data acquisition and signal processing module is used for performing nonlinear compensation on the optical signal of the main interferometer by using the optical signal of the auxiliary interferometer, and performing cross-correlation operation on a reference optical signal of the main interferometer and a measurement optical signal of the main interferometer which are based on the strain-free state and the strain state of the sensing optical fiber and are subjected to nonlinear compensation; and obtaining the strain position and the strain value of the sensing optical fiber.

The invention discloses a multi-sideband chirp modulation DAS system and a working method thereof, and relates to the technical field of distributed sound wave sensing. The DAS system comprises a narrow linewidth laser, an optical fiber coupler, a phase modulator, an electro-optical modulator, an erbium-doped optical fiber amplifier, an optical fiber circulator, a dense wavelength division multiplexer, a photoelectric balance detector, a data acquisition card, an arbitrary waveform generator, a direct current source and the like. The phase modulator is used for modulating constant-amplitude multi-frequency continuous light, the frequency number of light waves is related to the harmonic number of a microwave modulation signal, the frequency interval is determined by the fundamental frequency of the microwave modulation signal, the continuous light frequency can be flexibly modulated by adjusting the microwave modulation signal, and the modulation bandwidth is large; detected beat frequency signals are compressed into single-frequency signals through pulses, phase information of the single-frequency signals is demodulated, vibration signals along the sensing optical fiber can be detected, the spatial resolution of the system depends on the chirp frequency sweeping range, and the spatial resolution is high.

The invention provides a detection system of a micro optical fiber coupler based on a bidirectional optical frequency comb vernier effect, which can be applied to the technical field of photoelectric detection. The system comprises: an optical frequency comb light source configured to emit detection light; the beam splitter is arranged to split the detection light into first sub-detection light and second sub-detection light; the reference sensing unit is arranged to guide the first sub detection light to interact with a reference solution through an evanescent field of the first micro optical fiber coupler so as to output first transmission light; the detection sensing unit is arranged to guide the second sub detection light to interact with the solution to be detected through an evanescent field of the second micro optical fiber coupler so as to output second transmission light; the beam combiner is set to combine the first transmission light and the second transmission light to obtain a combined light spectrum; the spectrum analyzer is set to collect the combined light and generate a vernier spectrum; and the processor is set to determine the concentration of the liquid to be detected according to the vernier spectrum.

The present invention provides an optical waveguide coupler (1) comprising a crystalline substrate (2) of a (100) type having a top surface (2a) and a (100) crystallographic plane (2100), wherein the crystalline substrate (2) comprises: a V-groove (3) extending in a Z-direction (Z) in a projection onto the top surface (2a), wherein the Z-direction (Z) lies within a 〈110〉 crystal plane (2110) of the crystalline substrate (2), wherein the top surface (2a) and a 〈100〉 crystal plane (2100) of the crystalline substrate (2) form a first angle (α1) in an X / Y plane (XY) perpendicular to the Z-direction (Z), and an optical waveguide arranged on the top surface (2a) of the crystalline substrate (2). (4), wherein the optical waveguide (4) extends along the Z-direction (Z) in a projection to the top side, wherein the V-groove (3) and the optical waveguide (4) are designed such that,When an optical fiber (5) having a predetermined size and a fiber core (51) and a fiber tip (52) is inserted into the V-groove (3) such that a distance between an outer end (42) of the waveguide core (4) and the fiber tip (52) is less than a predetermined distance (d), the fiber core (51) is aligned with the waveguide core (41) such that a displacement of the fiber core (51) and the waveguide core (41) is less than a predetermined displacement. Furthermore, the present invention provides a method for manufacturing an optical fiber coupler (1).

The invention discloses an optical coherence tomography optical path structure and a dispersion compensation method thereof. The light path structure comprises a coherent light source, a 2 * 2 optical fiber coupler, a reference light path, a sample light path, an equal-wave-number spectrograph and an upper computer; low-coherence broadband light emitted by the coherent light source is divided into reference light and sample light after passing through the 2 * 2 optical fiber coupler, the reference light and the sample light are sequentially transmitted in a reference light path and a sample light path, the reference light and the sample light are retroreflected through a sample and a reference mirror and are retroreflected to the 2 * 2 optical fiber coupler according to an original light path, interference is generated, and interference light beams are transmitted to the equal-wave-number spectrometer. Interference light beams are split to an upper computer according to equal wave number intervals, and a tomographic image of a sample is obtained through algorithm processing of the upper computer. By means of the structure, the existing dispersion loss problem is solved from the source, most dispersion generated by a light path is solved, other dispersion is eliminated by adding a dispersion compensating mirror made of optical glass materials with certain thickness in the light path through algorithm calculation, the algorithm is simple, convenient and fast, and the imaging speed is high.

The concentrated light source optical fiber distributed lighting system comprises a concentrated light source module, an optical fiber transmission unit and a lighting terminal, and the concentrated light source module is integrated with a control unit; the optical fiber transmission unit is connected with the concentrated light source module and the lighting terminal; the concentrated light source module comprises a light source, an optical fiber coupler and a cooling fan. A use method of the concentrated light source optical fiber distributed illumination system comprises the following steps that S1, illumination intensity is input into an MCU through a human-computer interface, light is transmitted to an illumination terminal through an optical fiber transmission unit, and the illumination terminal scatters the light and projects the light to an illumination place; s2, the temperature sensor extracts a laser / LED module temperature signal and sends the laser / LED module temperature signal to the MCU; s3, the fan driving power supply judges whether to supply power to the cooling fan or not according to the signal of the MCU, and the cooling fan cools the concentrated light source module; and S4, the illuminance sensor collects the illuminance of the illumination target place and feeds back the illuminance to the MCU, and the laser / LED module is driven to emit light with the corresponding intensity.

The invention discloses a self-starting 9-shaped cavity laser and device based on motor disturbance, and relates to the technical field of lasers. The laser comprises a nonlinear amplification loop, a linear arm, a polarization maintaining optical fiber coupler and a motor disturbance module. And the polarization-maintaining optical fiber coupler is connected with the linear arm and the nonlinear amplification loop respectively. High-frequency mechanical vibration is applied to the polarization-maintaining passive optical fiber in the nonlinear amplification loop through the motor disturbance module, so that a high-strength initial noise signal is formed in the cavity, mode competition in the cavity is promoted, and noise is accelerated to enter a positive feedback area of the resonant cavity. Mode locking self-starting under the low pumping condition is achieved, pumping power waste is reduced, and the device cost is reduced.

The invention discloses a Fabry-Perot interference type hydrogen detection device and method. The Fabry-Perot interference type hydrogen detection device comprises a broadband light source, a spectrograph, an optical fiber coupler, a sensing probe, a test gas chamber and a reference probe, the sensing probe and the reference probe are provided with sensor structures based on an optical fiber Fabry-Perot cavity, and the optical fiber coupler outputs input light emitted by the broadband light source to the sensing probe and the reference probe through a port A, a port B and a port C; light reflected by the optical fiber Fabry-Perot cavities of the sensing probe and the reference probe is output to a spectrograph through a D port, so that an interference spectrum is demodulated; hydrogen to be detected is mixed with air, then enters the test gas chamber through the gas flow rate controller, and is discharged from the outlet; the sensing probe adopts an anodic aluminum oxide / palladium film as a terminal reflector of a Fabry-Perot cavity, and an interference spectrum is detected through a spectrograph to obtain hydrogen concentration information in the environment; the reference probe adopts two single-mode optical fiber end faces to align in a sleeve and form an air Fabry-Perot cavity, and the reference probe only provides a stable reference spectrum to realize a vernier effect.

The invention relates to a self-coherence optical fiber interference device and method for simultaneously measuring morphology and thickness. The device comprises a light source module (1), a measurement light path (2), a compensation light path (3), a spectrograph (4), a mechanical motion module (6) and a data processing module (5), the measuring light path (2) comprises an optical fiber circulator (21), an optical fiber retroreflector (22) and an optical probe (23) and is used for realizing focusing measurement and enabling reflected light of the end face of the optical fiber retroreflector (22) and reflected light of a transparent object to be measured to return; reflected light of the end face of the optical fiber retroreflector (2) and reflected light of the transparent object to be measured form a measuring light beam, and the measuring light beam enters the compensation light path (3); the compensation light path (3) comprises an optical fiber splitter (31), an optical fiber delay line (32) and an optical fiber coupler (33), the measuring light beam is subjected to optical path compensation to generate a compensation light beam, and the compensation light beam and the measuring light beam are combined and input into the spectrograph (4) together.

The invention relates to the technical field of chip packaging, in particular to a photoelectric co-packaging underfill isolation packaging framework and process. According to the invention, the underfill glue blocking hole is additionally designed in the underfill glue diffusion area at the outer edge of the optical fiber slot hole on the adapter plate, and through the resistance effect (interface difference and liquid tension) of the underfill glue blocking hole on the flowing of the underfill glue, the glue overflow range is accurately controlled, and the underfill glue is prevented from covering the optical fiber coupler of the optical chip. By optimizing the underfill isolation design, efficient coupling of the optical chip and the optical fiber is ensured in the pollution direction of the underfill, meanwhile, the packaging gap between the photoelectric chips is reduced, and the packaging density and compactness are improved; the process tolerance, the product yield and the system performance of photoelectric packaging are remarkably improved, and the method is particularly suitable for the application fields of high-density and high-performance calculation and optical interconnection.

The invention discloses a vector flow velocity measuring device and method based on a bidirectional scanning spectral domain optical coherence tomography technology. Comprising a super light-emitting diode light source, an optical fiber coupler, a polarization controller, an interferometer comprising a sample arm and a reference arm, and a collimating lens, the collimating lens, the grating, the focusing lens group and the linear array camera are sequentially connected through a light path; the linear array camera, the computer and the two-dimensional galvanometer are sequentially connected through a line; according to the method, the fixed bias vector velocity is introduced by utilizing the bidirectional scanning technology, the dynamic light scattering optical coherence tomography method and the Doppler optical coherence tomography method are combined, decoupling of each parameter of the vector flow velocity is efficiently and accurately realized, and a quantitative index is provided for vector flow velocity analysis. The vector flow velocity measuring device based on the bidirectional scanning spectral domain optical coherence tomography technology is simple in system setting and low in cost, the time resolution is improved by about 2.5 times, and the measuring time is shorter.

The utility model relates to a control device for a microwave anechoic chamber test system. Comprising a shielding box which is a sealed cavity provided with a cover plate, and the shielding box is provided with a power supply socket, a data socket and an optical fiber coupler; a control circuit board, an AC-DC power supply module, a data optical fiber transceiver and other modules are installed in the shielding box. A plurality of motor control units, a power supply interface and a communication interface are integrated on the control circuit board, and a first output end of the AC-DC power supply module is connected with the control board and is used for supplying power to the control board; one end of the data optical fiber transceiver is electrically connected with the optical fiber coupler, and the other end is electrically connected with the communication interface for converting the signal into an optical signal and outputting the optical signal. The control circuit board is placed in the shielding box, so that the size of the rotary table or antenna tower equipment is reduced, and the electromagnetic interference risk of a motor and a darkroom environment is reduced; the control circuit board integrates the servo motor control unit and the stepping motor control unit for modular design, serves as an independent unit of the darkroom test system, and is high in universality.

The invention provides a self-focusing type wafer three-dimensional shape precision detection device and method. The self-focusing type wafer three-dimensional shape precision detection device comprises a super-radiation light-emitting diode, an optical fiber coupler, a microscopic reference arm provided with a reference arm microscope objective, a self-focal length wafer scanning platform of a microscopic scanning platform, a near-infrared reflection type spectrograph and an upper computer. During detection, near-infrared broadband light radiated by the diode is coupled into the optical fiber coupler and then is divided into detection light and reference light; moving the wafer to be detected to the focal point of the detection light; the detection light is focused on a to-be-detected wafer sample to form measurement light carrying sample surface information, then the measurement light is backscattered by the sample surface and interferes with the reference light at the optical fiber coupler, a formed interference light signal is captured by the near-infrared reflection type spectrometer and then is transmitted into the upper computer, the wafer sample is moved at the focus of the detection light, and the measurement light is transmitted to the lower computer. Performing X-axis and Y-axis scanning to obtain three-dimensional shape data of the wafer; according to the invention, the high-precision nondestructive detection of the three-dimensional shape of the chip can be realized under the condition that the chip sample is not damaged.

The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber sensor system, a sensing signal measuring method, computer equipment and a medium. The optical fiber coupler comprises at least two optical fiber interference arms which are arranged in parallel and is used for dividing an optical signal into at least two beams and enabling the beams to be propagated along different paths to generate interference; the polarization controller is arranged at the emergent end of the optical fiber coupler and is used for regulating and controlling the polarization state and the polarization direction of the emergent light; the voltage control module is arranged on at least one optical fiber interference arm and used for changing the phase of the optical fiber by applying voltage; the image sensor is used for collecting interference fringe images and converting the interference fringe images into electric signals; and the data processing device is used for carrying out peak searching calculation on the electric signal to obtain stripe movement information, and obtaining a corresponding sensing signal value according to the relationship between the stripe movement information and the sensing signal. The application range of the interferometer in the visible light wave band is expanded, and the measurement precision of the interferometer is improved.

The invention discloses a polydimethylsiloxane sensitization optical fiber temperature and strain simultaneous measurement sensor. The sensor comprises an incident optical fiber, an optical fiber coupler, an optical fiber patch cord, a transmission optical fiber, a sensing cavity, a reference cavity and an emergent optical fiber, an optical signal enters the optical fiber coupler through the incident optical fiber and is divided into two beams of equal-intensity light in the coupler, the two beams of light are respectively input into the transmission optical fiber through the optical fiber patch cord and then enter the sensing cavity and the reference cavity which are coated with the polydimethylsiloxane, and the light is reflected by the cavities to form interference; the interference light is transmitted back to the optical fiber coupler through respective transmission optical fibers, so that a vernier spectrum is formed; the emergent optical fiber transmits an optical signal containing temperature strain information to a spectrograph, trough drift is analyzed through a dual-wavelength matrix demodulation method, and simultaneous measurement is achieved. By combining the vernier effect, the structural advantages of the Fabry-Perot interferometer and the advantage of high thermo-optical coefficient of the polydimethylsiloxane, the invention has the advantages of low cost, high sensitivity, high stability and the like.

The invention discloses a wind driven generator intelligent monitoring method and device based on an optical fiber sensor, and the method comprises the following steps: 1, optical fiber signal transmission and analysis: installing an optical fiber grating sensor in an area where a blade, a bolt and an air gap are located, and enabling the optical fiber grating sensor to be connected with an optical fiber grating signal analysis module through an optical fiber coupler, the analysis module sends an optical signal to the sensor and receives an optical signal reflected by the sensor; the fiber bragg grating signal analysis module demodulates the received optical signal, analyzes the change of optical wavelength, and extracts temperature, stress, vibration, deformation and air gap information of each monitoring point; through digital processing of sensing signals, the analysis module judges the state of blade, bolt and air gap information in real time and sends out an alarm signal according to a preset threshold value. 2, processing and outputting data; step 3, fault early warning and maintenance; according to the invention, the operation safety and efficiency of equipment can be improved.

The invention provides a Sagnac optical fiber vibration positioning structure based on a dual polarization structure. Comprising a broadband light source, a first polarization beam splitter, a first optical fiber coupler, a second optical fiber coupler, a first optical fiber delay ring, a second optical fiber delay ring, a third optical fiber coupler, a fourth optical fiber coupler, a second polarization beam splitter, a third polarization beam splitter, a vibration sensing optical fiber, a first reflector, a second reflector, a first photoelectric detector and a second photoelectric detector. According to the positioning structure, X polarized light and Y polarized light sense the same vibration signal in the same vibration sensing optical fiber, two paths of independent interference signals with fixed time delay are formed, and the fixed time delay is related to the vibration position; by demodulating the phase information of the two paths of interference light intensities and performing cross-correlation time delay estimation, the specific position of the external vibration signal can be positioned. The problem that a traditional Sagnac interference type optical fiber vibration sensing system is complex in vibration positioning algorithm and limited by vibration frequency is solved.

The utility model discloses a distributed sound wave sensing system for multi-frequency pulse modulation, and relates to the technical field of distributed sound wave sensing. The system comprises a narrow linewidth laser, an optical fiber coupler, a polarization-maintaining optical isolator, an acousto-optic modulator, a polarization-maintaining delay optical fiber, an erbium-doped optical fiber amplifier, a polarization-maintaining dense wavelength division multiplexer, an optical fiber circulator, an optical fiber Bragg grating, a piezoelectric transducer, a polarization controller, a photoelectric balance detector, a data acquisition card, an arbitrary waveform generator and the like. According to the utility model, the multi-frequency delay ring is utilized to carry out multi-frequency modulation, the frequency number of light waves is increased along with the circulation times of the light waves in the delay ring, and under the condition that the utilization of a large-bandwidth electro-optical modulator is not increased, the flexible modulation of the frequency is realized by utilizing a low-bandwidth acousto-optical modulator without being influenced by carrier frequency and sidebands of each order; the low-bandwidth acousto-optic modulator is used for frequency modulation in the multi-frequency delay ring, and compared with an electro-optical modulation or multi-acousto-optic / multi-light source modulation scheme, the modulation cost is effectively saved.

The application discloses a kind of EFPI optical fiber sensor multi-sensor multiplexing temperature-pressure demodulation system and method, including ASE broadband laser, optical circulator, EFPI optical fiber sensor, 2-way wavelength division multiplexer, N-way wavelength division multiplexer, N-way wavelength division demultiplexer, photoelectric detector, FBG, 1*2 optical fiber coupler, optical spectrometer, data processing system;The input port input of the optical circulator is connected with ASE broadband laser, the output port cir2 is connected with two cascaded FBGs, the output port cir3 is connected with EFPI optical fiber sensor, the input port of 2-way wavelength division multiplexer is connected with the output port cir4 of optical circulator, and the output port is connected with N-way wavelength division multiplexer;N-way wavelength division multiplexer is accessed via the input port of 1*2 optical fiber coupler, and outputs two-way signals, one-way is connected with N-way wavelength division demultiplexer via N-way photoelectric detector and data processing system, and the other way is connected with optical spectrometer;N channels are connected by cascaded FBG, and the cascade of N EFPI optical fiber sensors is realized.

The invention discloses a frequency doubling laser power stabilizing system. Comprising a seed light source, a first polarization-maintaining 1 # imgabs0 # 2 optical fiber coupler, a first semiconductor pumping source, a first polarization-maintaining beam combiner, a first polarization-maintaining doped optical fiber, a second semiconductor pumping source, a second polarization-maintaining beam combiner, a second polarization-maintaining doped optical fiber, a polarization-maintaining 2 # imgabs1 # 1 optical fiber coupler, a periodic lithium niobate waveguide, a temperature control system, a second polarization-maintaining 1 # imgabs2 # 2 optical fiber coupler and a photoelectric detector. After being amplified by two paths of lasers, the seed laser is converted into frequency-doubled laser through a temperature-controlled frequency-doubling crystal, a part of frequency-doubled laser is acquired and is collected by a photoelectric detector for feedback, on one hand, the frequency-doubled laser is fed back to a second semiconductor pumping source for adjusting the laser amplification power, and on the other hand, the frequency-doubled laser is fed back to a frequency-doubled temperature control circuit for adjusting the laser amplification power. The method is used for adjusting frequency-doubled output power and realizing closed-loop stability of laser power. The output power stability of the frequency-doubled laser is improved, and the frequency-doubled laser is suitable for high-precision application scenes.

The utility model provides a high-resolution spectral confocal measurement device, which includes a light source, a fiber coupler, a spectral confocal lens, a spectral analysis unit and a data processing unit. The spectral confocal lens is arranged between the fiber coupler and the sample to be measured. The spectral confocal lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence. The first lens is a double concave lens, the second lens is a meniscus lens, the third lens is a plano-convex lens, the fourth lens is a double-cemented lens, the fifth lens is a meniscus lens, and the sixth lens is a meniscus lens. With such an arrangement, the spectral confocal lens is improved from multiple aspects such as expanding the incident light beam, correcting aberrations, reducing spherical aberrations, and correcting coma and chromatic aberration, thereby greatly improving the resolution of the lens. The light source is further connected to the spectral confocal lens through a fiber coupler, so that the entire device has a compact structure and is easy to integrate and install.

The invention relates to the technical field of laser, in particular to a high-signal-to-noise-ratio modulation transfer spectrum frequency stabilization light path system. The system comprises a laser, an optical isolator, a first half-wave plate, a first polarization splitting prism, an optical fiber coupler, a second half-wave plate, a second polarization splitting prism, a first reflecting mirror, an electro-optical modulator, a second reflecting mirror and a third polarization splitting prism, wherein the first half-wave plate is used for adjusting the power of frequency stabilization light; the second half-wave plate is used for adjusting the power ratio of pump light to probe light; a first quarter-wave plate, a second quarter-wave plate, an atomic gas chamber and a photoelectric detector; after the output of the laser is isolated by the optical isolator, the first half-wave plate and the first polarization splitting prism are matched to adjust the frequency stabilization total beam power to about 5mW; the pump light is modulated by the electro-optical modulator, the probe light and the pump light reversely interact in the atomic gas chamber in an anti-phase circular polarization state, and the signal-to-noise ratio of a modulation transfer signal and the stability of a frequency stabilization system are remarkably improved.

The invention provides a high-power optical fiber laser treatment system which comprises a rack body, a signal control module, a treatment scheme management module, a signal driving module, an optical fiber laser assembly and a constant temperature control module. The signal control module, the treatment scheme management module, the signal driving module, the optical fiber laser assembly and the constant temperature control module are all installed on the machine frame body, and the optical fiber laser assembly comprises a semiconductor pump laser, a thulium-doped optical fiber, a coupler, a transmission optical fiber and an aspherical lens. The semiconductor pump laser, the thulium-doped optical fiber, the coupler and the transmission optical fiber are in light path connection, the central axes of the semiconductor pump laser, the coupler, the thulium-doped optical fiber, the transmission optical fiber and the aspherical lens coincide, the therapeutic scheme management module is in communication connection with the signal control module, and the signal driving module is in communication connection with the signal control module. The semiconductor pump laser is in communication connection with the signal driving module, and the constant temperature control module is in communication connection with the signal control module and the fiber laser assembly.

The invention discloses an electrically-controlled variable optical attenuator based on a multistage wedge-shaped liquid crystal box and an attenuation control method, the attenuator comprises a laser, the laser provides an incident light signal, the divergent incident light signal is converted into a collimated parallel light beam through a collimator, the collimated parallel light beam is subjected to deflection modulation through a multistage wedge-shaped liquid crystal box module, and the modulated light beam is converted into a modulated light beam; the multi-channel liquid crystal controller is coupled to the output optical fiber through the optical fiber coupler, and generates and outputs driving voltage signals capable of being independently adjusted to the N-stage wedge-shaped liquid crystal box module, so that each wedge-shaped liquid crystal box in the multi-stage wedge-shaped liquid crystal box module is independently controlled; the control method comprises the steps of receiving a target instruction, querying a system-level relationship, distributing a deflection task, querying a device-level relationship, outputting a driving signal and performing closed-loop feedback correction. According to the invention, a large attenuation range is obtained, and at the same time, millisecond-level and even sub-millisecond-level rapid response is realized; the precision, the linearity and the usability of attenuation control are improved, and the control complexity is reduced.

The invention discloses an optical fiber laser phased array self-adaptive optical system based on an integrated optical chip. The optical fiber laser phased array self-adaptive optical system comprises a self-adaptive optical fiber coupler array, the integrated optical chip, an optical fiber splitter, a photoelectric detector, a control platform and a high-voltage amplifier. The integrated optical chip comprises an optical fiber coupling interface, a waveguide, a phase shifter, a Mach-Zehnder intensity modulator and the like. The adaptive optical fiber coupler array couples incident light to the optical fiber array, and corrects tilt aberration based on an optimization control algorithm to realize efficient adaptive coupling of spatial light to optical fibers; the sub-beams enter an integrated optical chip through an optical fiber coupling interface, phase and intensity modulation is performed on the sub-beams in the optical chip based on an optimization control algorithm, and co-phase synthesis output of the beams is realized; the output light is divided into two paths by the optical fiber splitter, one path is connected with the photoelectric detector for control, and the other path is connected with the application end. Based on light path reciprocity, the system has a transmitting or receiving and transmitting integrated function, and has important application prospects in the fields of space optical communication, laser energy transfer and the like.

The invention discloses a wavelength and repetition frequency independent adjustable gain-competition-free polarization-maintaining fiber common-cavity double-optical-comb mode-locked laser and an adjusting method, and relates to the technical field of optical frequency combs. In order to solve the problems that a system is easily influenced by an external environment, the anti-interference capability is poor and gain competition exists between optical combs due to the existence of a single-mode optical fiber in an existing optical fiber double-optical-comb structure, the invention provides an optical fiber double-optical-comb structure. According to the technical scheme, the laser comprises a polarization-maintaining pump laser, a first polarization-maintaining optical fiber coupler, a polarization-maintaining optical fiber wavelength division multiplexer, a polarization-maintaining ytterbium-doped optical fiber, a polarization-maintaining collimator and a blazed grating, laser output by a second polarization-maintaining optical fiber coupler is combined through a polarization-maintaining polarization beam combiner, and the polarization-maintaining polarization beam combiner serves as a horizontal polarizer and a vertical polarizer; the separated polarized laser is respectively coupled to a slow axis and a fast axis of a common-end tail fiber, and a semiconductor saturable absorber is used as a reflection end face. According to the invention, a full polarization-maintaining structure is adopted, the external environment resistance is strong, and the stability is greatly improved.

The invention provides a laser Doppler velocimeter indicating value error calibration device to solve the problems that in the prior art, the structure is complex, the reference speed upper limit is low, and danger exists. The indicating value error calibration device for the laser Doppler velocimeter comprises a single-frequency laser, a first wavelength meter, a second wavelength meter, a 1 * 2 optical fiber beam splitter, a 2 * 1 optical fiber coupler and an optical fiber isolator. The indicating value error calibration device for the laser Doppler velocimeter is simple in structure, low in cost, high in safety coefficient and high in reference speed. In addition, the invention also provides a laser Doppler velocimeter indication error calibration method.

The present invention provides a semiconductor laser-based soft tissue surgery system, which comprises a light source, an optical fiber output assembly, an electronic control assembly, a power assembly, and a cooling and temperature control assembly. The light source comprises a first laser device assembly, a second laser device assembly, a laser shaping assembly, and a first optical fiber coupler; the first laser device assembly is configured to emit visible light laser or emit visible light laser and near-infrared laser at the same time, and the second laser device assembly is configured to generate low-power visible light laser with the power not greater than 5 mW. The laser emitted by the first laser device assembly and the second laser device assembly is collimated and combined by means of the laser shaping assembly, coupled to the optical fiber output assembly by means of the first optical fiber coupler, and then transmitted to a target position.

The invention relates to the technical field of optical design, and discloses a double-beam differential measurement device and method for the polarization sensitivity of a metasurface grating, and the method comprises the steps: dividing a pre-generated light beam into a first light beam and a second light beam through an optical fiber coupler, carrying out the dynamic switching of the polarization state of the second light beam, and obtaining a second incident light beam, adjusting the first light beam based on the second incident light beam to obtain a first incident light beam; enabling the first incident light beam to pass through a first path without the metasurface grating, enabling the second incident light beam to pass through a second path comprising the metasurface grating, and obtaining a first output light beam and a second output light beam; performing time domain difference on the first output light beam and the second output light beam, and calculating to obtain a multi-polarization-state differential signal; correcting the multi-polarization-state differential signal through a preset differential correction mechanism to obtain a corrected differential signal; calculating the polarization sensitivity of the metasurface grating according to the corrected differential signal; according to the invention, the accuracy of the calculated polarization sensitivity of the metasurface grating can be improved.