203 results about "Laser modulation" patented technology

A wide-field dynamic magnetic imaging device and method. The wide-field dynamic magnetic imaging device comprises: a probe assembly (1), comprising a diamond (101) containing NV centers; a microwave magnetic field assembly (2) configured to generate a uniform microwave field and a uniform bias magnetic field in the vicinity of the diamond (101), so as to regulate the spin energy level of the diamond (101) and the quantum state evolution process; a laser modulation assembly (3) configured to output an initial uniform pulsed laser to excite the diamond (101) to emit fluorescence; a fringe light modulation assembly (4) configured to modulate the initial uniform pulsed laser to output a fringe pulsed laser, causing the fluorescence emitted by the diamond (101) to be fringe fluorescence, or to modulate the fluorescence emitted by the diamond (101) into fringe fluorescence; a fluorescence detection assembly (5) configured to perform spatial imaging on the fringe fluorescence to obtain magnetic field information of a sample under test (7), thereby obtaining an initial magnetic image of said sample (7); and a data processing assembly (6) configured to perform Fourier transform and inverse Fourier transform on the initial magnetic image to obtain a first magnetic image.

The invention belongs to the technical field of flow field optical measurement, and particularly relates to a high-enthalpy plasma gas temperature measurement method, system and device based on an absorption spectrum. Generating a composite modulation signal through a high-frequency sine wave and a low-frequency sawtooth wave, and enabling incident light to pass through a flow field measurement area in parallel through laser modulation and beam shaping; the detector receives the transmission light and converts the transmission light into an electric signal containing harmonic information, the signal acquisition device is used for performing signal acquisition, the phase-locked demodulation algorithm is used for extracting second harmonic, and the temperature is inversely deduced by combining the double-spectral-line temperature measurement method and the Fourier coefficient amplitude ratio of the second harmonic with the HITRAN database. The system comprises a signal driving module, a laser emission module, a detection acquisition module and a temperature measurement module. The device is composed of a signal generator, an in-phase adder and the like, and a laser is matched with a driving power supply to guarantee stable work. According to the scheme, aiming at the problems of weak signal absorption and insufficient signal-to-noise ratio under complex working conditions, the measurement accuracy and reliability are improved by composite modulation, harmonic extraction and a bispectral line algorithm, and an effective means is provided for research on thermal characteristics of the high-enthalpy plasma.

The invention discloses a cavity length locking and laser frequency stabilization system and method of a Fabry-Perot cavity. The cavity length locking system of the Fabry-Perot cavity comprises a laser, a laser modulation module, the Fabry-Perot cavity and a cavity length locking module. Wherein the laser modulation module is arranged at the emitting end of the laser and is used for receiving laser emitted by the laser, outputting first laser and second laser, emitting the first laser into the Fabry-Perot cavity from the first end of the Fabry-Perot cavity and emitting the second laser into the Fabry-Perot cavity from the second end of the Fabry-Perot cavity. And the cavity length locking module is connected with the Fabry-Perot cavity and the laser modulation module, and is used for locking the cavity length of the Fabry-Perot cavity in response to the first reflection laser reflected from the first end of the Fabry-Perot cavity and a signal received from the laser modulation module.

The invention discloses a high-efficiency low-loss preparation method of a single crystal silicon carbide wafer. The method comprises the following steps: A, grinding the surface of a single crystal silicon carbide ingot; b, the ultrafast pulse laser is modulated into N light spots, the N light spots are focused in the crystal ingot and distributed in the axial direction of the crystal ingot according to preset depth positions, and all the light spots are parallel to the horizontal direction; all the light spots are scanned at the same time, the scanning surface formed by the same light spot covers the cross section of the single crystal silicon carbide crystal ingot in the horizontal direction, and N laser modified layers are formed after scanning; c, carrying out stress-induced separation on the single crystal silicon carbide crystal ingot in the step B; and D, grinding the cutting surface of the single crystal silicon carbide wafer. According to the high-efficiency and low-loss preparation method of the single-crystal silicon carbide wafer, the preparation efficiency of the silicon carbide wafer is improved, meanwhile, the material loss of the single-crystal silicon carbide ingot is reduced, and the yield of the single-crystal silicon carbide ingot is improved.

The invention relates to the technical field of optical precision measurement, in particular to an ultra-high time resolution camera time characteristic detection device and method, and the device comprises a laser source which is used for generating pulse laser; the polarization modulation element is arranged on an emergent light path of the laser source and is used for modulating the pulse laser into circularly polarized light; the spectroscope is arranged on an emergent light path of the polarization modulation element and is used for decomposing the circularly polarized light into a first linearly polarized light beam and a second linearly polarized light beam; the first optical path unit is used for guiding the first linearly polarized light beam to the cylindrical optical element along a fixed optical path; the second optical path unit is used for adjusting the optical path of the second linearly polarized light beam and guiding the second linearly polarized light beam to the cylindrical optical element; and the cylindrical optical element is used for receiving the first linearly polarized light beam and the second linearly polarized light beam and respectively projecting the first linearly polarized light beam and the second linearly polarized light beam to an imaging surface of a camera to be detected to form two spatially separated light spots. The objective of the invention is to improve camera time characteristic calibration precision and efficiency.

A method for self-correcting key generation for a decoy and signal pulses based quantum key distribution (QKD) protocol includes emitting laser light; modulating intensity of the laser light to generate the decoy pulses having a first mean photon number (MPN) and the signal pulses having a second MPN greater than the first MPN; modulating phase of the signal and decoy pulses with key-generation state information and self-correction state information correlated with the key-generation state information, respectively, for being transmitted; detecting a phase and a time-stamp data of the modulated decoy and signal pulses upon being received; determining an error count using the phase and time-stamp data of at least one of the received decoy or signal pulses; and generating a self-corrected key using the self-correction state information when the error count is within a pre-determined threshold.

This invention relates to a Bragg light generation system and method suitable for Bragg-type atomic interferometers. The system includes: a laser for generating a first laser beam with a frequency in a preset atomic absorption peak band; an optical circulator for propagating the first laser beam to a cascaded acousto-optic modulator and receiving two third laser beams returned from the cascaded acousto-optic modulator; a cascaded acousto-optic modulator for diffracting the first laser beam into two second laser beams with opposite propagation directions through Bragg diffraction of two acousto-optic crystals; an optical assembly for performing secondary diffraction on the two second laser beams and reflecting the two mutually perpendicular second laser beams to the cascaded acousto-optic modulator; and an output module for splitting and sampling the two third laser beams and modulating the sampled third laser beams into Bragg laser beams in the target frequency band. This invention reduces the path separation of the two Bragg laser beams by using a quasi-common optical path, thereby reducing phase noise and improving measurement accuracy.

The invention discloses a femtosecond pulse laser modulation-based GaN-based micro light-emitting diode test system, which comprises a femtosecond pulse laser excitation module, a first detection light path, a to-be-tested GaN-based micro light-emitting diode, a photovoltage detection and bias control module, a photoluminescence detection module and a control module, the control module is configured to control the excitation power and the external bias voltage of the femtosecond pulse laser excitation module, and synchronously collect a photoluminescence spectrum signal and a photovoltage signal; according to the excitation power, the external bias voltage, the photoluminescence spectrum signal and the photovoltage signal, the competition relation between carrier drift extraction and local radiation recombination under different bias electric field conditions is obtained, and therefore an experimental basis is provided for structural design and working bias optimization of the GaN-based micro light-emitting diode device to be tested.

The invention discloses Ge-Sn-Se-S acousto-optic chalcogenide glass, the chemical composition formula of the Ge-Sn-Se-S acousto-optic chalcogenide glass is Ge20SnxSe80-x-ySy, x and y respectively represent molar fractions of Sn and S, x is equal to 5-12.5, y is equal to 0-25, and a basic network unit of a glass frame of the Ge-Sn-Se acousto-optic chalcogenide glass is of a stable tetrahedral structure with Ge or Sn as the center. The acousto-optic chalcogenide glass is large in composition regulation and control range, easy to form, non-toxic, environment-friendly, green and quaternary chalcogenide glass system, high in linearity and refractive index and high in acousto-optic performance, the acousto-optic quality factor M2 under the wavelength of 1550 nm is 211.8 * 10 <-18 > s < 3 > / g to 348.9 * 10 <-18 > s < 3 > / g, the ultrasonic attenuation alpha under the ultrasonic frequency of 10 MHz is 0.72 dB / cm to 4.89 dB / cm, the laser damage threshold value is 2.94 J / cm < 2 > to 15.54 J / cm < 2 >, and the acousto-optic chalcogenide glass can be used for preparing the acousto-optic chalcogenide glass. The material has the potential of being applied to acousto-optic devices for high-power laser modulation, and can be widely applied to the acousto-optic field as an acousto-optic medium.

The invention discloses a sine frequency modulation harmonic error compensation method based on Bessel function modulation characteristics, and relates to the technical field of sine frequency modulation nonlinear parameter compensation and high-precision measurement of target absolute distance based on multi-wavelength interference. The problem that the constant phase demodulation precision is insufficient due to the fact that carrier harmonic waves, accompanying amplitude modulation and modulation depth errors cannot be effectively suppressed due to laser modulation nonlinearity in existing sine frequency modulation distance measurement is solved. According to the method, after sine frequency modulation interference signals are collected, high-pass filtering is carried out to remove low-frequency components, Hilbert transform is carried out to remove envelope suppression associated amplitude modulation, window function frequency mixing is carried out to extract modulation depth, a matched carrier containing second harmonics is constructed, and frequency modulation harmonic parameter optimization is achieved through baseband amplitude maximization. And finally, carrying out orthogonal demodulation on the compensated interference signal to obtain a high-precision constant phase. The method is suitable for high-precision multi-wavelength interference ranging, precision displacement measurement and optical metering systems.

The invention discloses a photoacoustic spectrum trace gas detection device and method based on a secondary demodulation technology. The device comprises a tunable laser, a laser collimation device, a focusing lens, a gas chamber, a quartz tuning fork resonance circuit, a first lock-in amplifier, a trigger capture circuit, a phase modulation circuit, a second lock-in amplifier and a control and signal acquisition device. In the aspect of automatic tracking of the frequency, the quartz tuning fork is integrated into an oscillator circuit, and automatic tracking of the laser modulation frequency is achieved. The oscillator circuit can automatically adjust the output according to the current resonant frequency of the quartz tuning fork, and ensures that the laser is always modulated at the optimal frequency. In the aspect of continuous phase modulation, traditional fixed phase setting is replaced, the phases of electric excitation and photoacoustic excitation are continuously modulated, and pure photoacoustic signals are separated by using two lock-in amplifiers, so that a complex phase calibration process is avoided, and the accuracy and stability of signal detection are improved.

The invention provides a miniaturized laser processing system based on a metasurface laser processing head, which relates to the technical field of laser processing and comprises a light path modulation module, the metasurface laser processing head, a displacement device, a sample adjustment module and an image observation module, the metasurface laser processing head, the sample adjusting module and the image observation module are located on the same axis, and the light path modulation module modulates laser emitted by the laser light source into target polarized light and projects the target polarized light to the metasurface laser processing head; the metasurface laser processing head is fixedly connected with the displacement device and comprises one or more processing areas with functions of forming a point light field, a line light field, a surface light field, a body light field, a light field with a specific function expression and a space-time light field; the sample adjusting module enables the sample to be located in a modulation light field formed by the target polarized light, and laser processing is conducted on the sample. According to the invention, the integration level and functionality of the laser processing system can be improved.

A phase generated carrier interrogator comprises: a composite multicarrier synthesizer operable to generate at least one laser modulated carrier signal for modulating a laser radiation source; a power monitoring branch operable to measure a power metric of the laser radiation source; a wavelength reference branch comprising a wavelength reference for wavelength stabilization of the laser radiation source and a wavelength reference detector for measuring the wavelength reference to obtain a wavelength reference signal; and a signal processing module. The signal processing module is operable to: estimate a monitoring power carrier delay, the monitoring power carrier delay describing a propagation delay of the power monitoring signal in a laser power monitoring signal path; and estimating a wavelength reference excess delay using the estimated monitored power carrier delay, the wavelength reference excess delay describing a difference between the wavelength reference power carrier delay and the monitored power carrier delay, the wavelength reference power carrier delay describing a propagation delay of the wavelength reference signal in the wavelength reference branch.

The invention belongs to the technical field of fluorescence spectrum collection, and particularly relates to a quasi-three-dimensional fluorescence spectrum collection method and spectrograph based on a software phase locking technology, and the method comprises the following steps: respectively modulating coprime modulation frequencies of a plurality of laser light sources with different wavelengths, and synchronously exciting the laser light sources to the surface of a sample; a fluorescence signal generated on the surface of the sample is received and processed by a linear array CCD detector to obtain a multi-wavelength spectral signal simultaneously containing background light, scattered light and fluorescence components; inputting the multi-wavelength spectral signal into a software phase-locked amplification system, introducing a Costas ring to the software phase-locked amplification system for real-time tracking and correction, and generating a synchronous reference signal consistent with the laser modulation frequency; inputting the synchronous reference signal into a software lock-in amplifier, and extracting a plurality of pure fluorescence spectrum components excited by specific-frequency laser; and synthesizing the plurality of pure fluorescence spectrum components to finally form a quasi-three-dimensional fluorescence spectrum.

The invention provides a self-wave-locking method and system based on laser photoacoustic spectrometry gas detection, and relates to the technical field of optical gas sensing, by fusing multi-physical field sensing data such as photoacoustic signals, sound field distribution, thermal deformation and the like, a first state vector representing the actual performance of a current system is calculated in real time, and a second state vector representing the actual performance of the current system is calculated in real time; a multi-objective optimization function is used for simultaneously optimizing a signal-to-noise ratio, linearity and energy consumption control to serve as a criterion, a cooperative control instruction is generated in a rolling mode, excitation light modulation parameters and cavity acoustic mode parameters are accurately adjusted, double dynamic tracking and locking of laser modulation frequency and cavity acoustic resonance frequency are achieved, and when external conditions change, the frequency of the cavity acoustic resonance frequency can be dynamically tracked and locked. According to the method, the detection sensitivity and the signal stability which are close to theoretical limits are automatically and continuously kept all the time, the calculated system nonlinearity index is used as an internal criterion, a concentration inversion mode is intelligently switched to carry out gas concentration value calculation, and seamless, continuous and wide dynamic range measurement from ppb level to percentage level is realized.

The present invention addresses the problem of improving convenience in eavesdropping countermeasures in a physical layer. An optical transmission device 1 modulates laser light in accordance with a Y-00 protocol so that N-value transmit information (N=integer 2 or greater) corresponds to M symbol points (M=integer greater than or equal to N), and when an optical signal associated with prescribed symbol points is received, it is detected as being at the same position in an IQ plane as an optical signal associated with the other symbol points, and transmits the transmit information as an optical signal (cipher signal) with first strength. A cryptographic signal reception unit 21 receives in a transmission path 3, etc., an optical signal (cryptographic signal) having been attenuated from the first strength. The input unit of a beam splitter 144 modulates a laser in accordance with the Y-00 protocol for demodulation and acquires an optical signal. The beam splitter 144 and a balance PD 145 cause the optical signal having been attenuated from the first strength to be interfered with a laser-modulated optical signal. This configuration solves the abovementioned problem.

An optical device includes a generator, a light emitter, a modulator, an optical amplifier, a current source, a storage, and a controller. The generator generates an electric signal of a multilevel amplitude modulation method. The light emitter emits laser light. The modulator modulates the laser light using the electric signal and outputs an optical signal. The optical amplifier optically amplifies the modulated optical signal according to a drive current. The current source adjusts the drive current to be supplied to the optical amplifier. The storage previously stores an information with respect to input-output characteristics of the optical signal in the optical amplifier relative to drive current value of the drive current. The controller acquires, from the storage, the input-output characteristics corresponding to the drive current value of the drive current supplied to the optical amplifier and controls the electric signal based on the acquired input-output characteristics.

The invention discloses a mid-infrared laser based on three-device on-chip integration and a preparation method thereof, relates to the crossing field of a semiconductor laser technology and an optical communication technology, and solves the problem that the existing quantum cascade laser QCL technology cannot give consideration to both high modulation rate and high power. An intermediate infrared laser comprises a QCL unit, an EAM unit and an SOA unit which are sequentially arranged on a substrate. The substrate comprises a semi-insulating InP (Indium Phosphate); the QCL unit, the EAM unit and the SOA unit share the same ridge-shaped waveguide structure and grow through epitaxy butt joint. The method provided by the invention is suitable for a mid-infrared band space communication scene with high requirements on the laser modulation rate, the output power and the single-mode stability.

The invention provides a quantum communication teaching experiment system and method. The quantum communication teaching experiment system comprises an Alice sending end and a Bob receiving end, the Alice sending end is provided with a first laser light source and a first half-wave plate, the first laser light source can emit linearly polarized light at intervals, and the linearly polarized light is randomly modulated into an emission polarization state through the first half-wave plate and is emitted to the Bob receiving end; the Bob receiving end is provided with a second half-wave plate, a first polarization beam splitter, a first detector, a second detector and a first postprocessor, and the first postprocessor is in communication connection with the first detector and the second detector; the linearly polarized light emitted from the Alice sending end is randomly measured and modulated by the second half-wave plate and then is emitted to the first polarization beam splitter, and the first detector is used for detecting the linearly polarized light reflected and emitted by the first polarization beam splitter. The second detector is used for detecting the linearly polarized light transmitted and emitted by the first polarization beam splitter, and the first postprocessor is used for comparing the photoelectric conversion voltage of the first detector and the photoelectric conversion voltage of the second detector so as to control the corresponding indicator lamp to be turned on. The BB84 quantum communication protocol is simulated, and experimenters can operate laser modulation and observe experimental phenomena, so that the BB84 quantum communication protocol can be fully understood.

The present invention proposes a device for measuring particle velocity under strong background interference using modulated laser light. The device comprises a laser light intensity modulation system for modulating the laser light into a laser with varying intensity according to a modulation frequency; a data acquisition and processing system for collecting the scattered light signal from the particles when the laser light of varying intensity irradiates the particles, performing a bandpass filter on the scattered light signal centered on the modulation frequency, and obtaining the particle velocity based on the bandpass filtered scattered light signal. The device proposed by the present invention is suitable for measuring particle velocity under strong background interference and can solve the problem of particle velocity measurement failure caused by strong background noise during the measurement process.

The invention discloses a printing method for modulating the line width through double lasers, and belongs to the technical field of 3D printing. The method comprises the following steps that two sets of long-strip-shaped laser beams are set, and the scanning widths of the two sets of long-strip-shaped laser beams are both D; the to-be-printed pattern is divided into a plurality of printing blocks, and the width of the printing blocks is not larger than D; and when each printing block is printed, the sum of the power of the two sets of long-strip-shaped laser beams is modulated to be equal to the power needed by metal melting, the two sets of long-strip-shaped laser beams conduct synchronous scanning in the length direction of the printing blocks, and in the scanning process, according to the actual line width d of the current printing position, the laser overlapping area of the two sets of long-strip-shaped laser beams is adjusted, the width of the overlapping area is the same as the actual line width d at the current position, and the position of the overlapping area is overlapped with the position of the current to-be-printed part. According to the invention, thickness modulation can be carried out at microsecond-level time in the printing process, and when the same line is scanned, the size of the line width can be changed at will according to a printing pattern, so that the printing efficiency is improved.

The application discloses a kind of adjustable distributed optical fiber sensing performance promotion device, sensing system and method, device includes: narrow linewidth laser, acoustooptic modulator, first signal generator and frequency shift ring;Narrow linewidth laser is configured to output narrow linewidth laser to acoustooptic modulator;First signal generator is configured to generate pulse function signal, function signal controls acoustooptic modulator, and single-frequency laser is modulated into pulsed light;Acoustooptic modulator is configured to modulate single-frequency laser into corresponding pulsed light in acoustooptic modulator according to the pulse function signal generated by first signal generator;Frequency shift ring is configured to multiple cyclic frequency shifts of pulsed light into it, and generate broadband multi-frequency light output.The device generates MHz-level pulsed light by acoustooptic modulator modulation, and generates GHz-level broadband multi-frequency light by multiple cyclic frequency shifts of frequency shift ring, which is applied to sensing system, and the response bandwidth of sensing system can be improved, and the flexibility of sensing test is improved.

The present disclosure provides a wide-field dynamic magnetic imaging device and method, which includes: a probe assembly including a diamond containing NV color centers; a microwave magnetic field assembly adapted to generate a uniform microwave field and a uniform bias magnetic field near the diamond to regulate the spin energy level and quantum state evolution process of the diamond; a laser modulation assembly adapted to output an initial uniform pulse laser to excite the diamond to emit fluorescence; a stripe light modulation assembly adapted to modulate the initial uniform pulse laser to output a stripe pulse laser so that the fluorescence emitted by the diamond is stripe fluorescence; or to modulate the fluorescence emitted by the diamond into stripe fluorescence; a fluorescence detection assembly adapted to perform spatial imaging of the stripe fluorescence to obtain magnetic field information of a sample to be tested, thereby obtaining an initial magnetic image of the sample to be tested; and a data processing assembly adapted to perform Fourier transform and inverse Fourier transform processing on the initial magnetic image to obtain a first magnetic image.

The application relates to the technical field of spectral analysis, and discloses a fluorescence spectral analysis device and method based on a solid-state electron spin ensemble, wherein the spectral analysis device comprises a laser modulation unit, a confocal unit and a fluorescence processing unit; the laser modulation unit comprises a laser, a Griesinger-Taylor prism, an acousto-optic modulator, a beam expander, a collimating lens, a spatial light modulator, a spatial filter and a half-wave plate which are sequentially arranged; the confocal unit comprises a dichroic mirror, a focusing lens, a diamond and a microwave antenna which are sequentially arranged; the diamond has a solid-state electron spin NV color center; and the fluorescence processing unit comprises a filter group, a sleeve lens, a lens, a linear polarizer, a Bertin lens and a camera which are sequentially arranged. The application distinguishes the fluorescence generated by different axial NV color centers from the fluorescence level, and provides a thought and method for the miniaturization and bias magnetic field removal of a quantum detection device of the NV color center.

The application relates to a laser-assisted micro-anode local area electro-deposition additive manufacturing device and method, and belongs to the technical field of additive manufacturing and local area electro-deposition. A support is fixed on a base, a screw rod device is installed above the support and is connected with an xy-axis moving device, a z-axis moving device is installed on the xy-axis moving device, a micro-anode device is connected to the z-axis moving device, a printing chamber is installed on an adjustable support and can move along the z-axis, a light modulation device is installed on an adjustable frame and can move along the z-axis, and the adjustable frame and a laser are fixed on the base. The method combines laser modulation technology and electrochemical deposition technology, uses laser modulation to generate patterned light to generate a virtual electrode for local area electro-deposition, greatly improves printing resolution and part performance, further improves printing precision, avoids the generation of thermal residual stress in the metal part, the performance of the part is more superior, and the method is used for micron-level metal part manufacturing.

The present invention is applicable to the field of pulsed laser technology and provides a pulsed laser modulation system. The system includes: a laser seed source for emitting a laser signal; a polarization-maintaining circulator having an incident end, a first emission end, and a second emission end, with the laser seed source and the incident end of the polarization-maintaining circulator being located on the same optical path; a fiber preamplifier and a laser pulse stretcher, with the first emission end, the fiber preamplifier, and the laser pulse stretcher being sequentially arranged on the same optical path; and an acousto-optic modulator and a fiber amplifier, with the second emission end, the acousto-optic modulator, and the fiber amplifier being sequentially arranged on the same optical path. The present invention proposes a design scheme for a pulsed laser modulation device that integrates stretching, preamplification, and frequency selection. By using this scheme, a low-repetition-rate pulsed laser output with a compact structure, good stability, and a high signal-to-noise ratio can be achieved.

The invention discloses a delay measurement system and method for a microwave over fiber transmission link, and belongs to the technical field of microwave photonics. The modulator is used for modulating the radio-frequency signal generated by the radio-frequency signal generator to an optical carrier and generating modulated light containing + / -1-order sidebands; the radio frequency signal is a dual-tone signal with the frequency range of 30 GHz to 70 GHz; the frequency shift unit is used for performing frequency shift on the modulated optical signal; and the dual-optical mixing unit is used for mixing the return signal and the reference signal and converting the phase shift direct detection of the high-frequency signal into the relative phase shift detection of the intermediate-frequency signal. A dual-tone signal is modulated into a 1550nm optical carrier, + / -1-order sidebands are separated through a dual-optical mixing structure, intermediate frequency signals of the + / -1-order sidebands are detected through a balanced photoelectric detector, and phases are detected, so that link transmission delay is calculated. The problem of phase ambiguity of high-frequency signals during large-range measurement is solved, and large-range absolute delay measurement is realized.

A method of manufacturing an element (93) having a through-hole (88, 98), the method comprising: a primary forming step of irradiating a laser beam onto a workpiece member (7, 8) to form a pilot hole (981) having a smaller inner diameter than the through hole (88, 98) in the workpiece member (7, 8) while receiving light from the workpiece member (7, 8) by a light detecting unit (17); an intensity determining step for determining whether an intensity of the light detected by the light detecting unit (17) is less than or equal to a predetermined threshold value; a laser modulation step for modulating a spatial light phase of the laser beam irradiated onto the workpiece element (7, 8) in response to determining that the intensity of the light detected by the light detection unit is less than or equal to the predetermined threshold value; and a secondary forming step of irradiating the laser beam having the modulated spatial light phase onto an edge portion of the pilot hole (981) to form the through hole (88, 98).

The invention discloses an SPR phase imaging system based on a four-polarization filtering array, and the system comprises an incident light path which is used for generating area array laser; the SPR module is used for receiving the area array laser and carrying out SPR sensing to obtain an area array laser modulation result related to a to-be-detected substance; and the imaging light path is used for carrying out amplification and filtering modulation on the area array laser modulation result so as to carry out imaging on a four-polarization array, and carrying out matched filtering and double-differential phase resolving on a four-polarization image so as to obtain an imaging result. According to the invention, through polarization virtual image generation and cross-channel block matching, and in combination with four-dimensional collaborative filtering, the noise suppression efficiency is improved; and through double differential phase resolving, the dynamic range is expanded to 0.06 RIU, and the resolution ratio is superior to that of the RIU. The invention solves the problem of mutual restriction of dynamic range and resolution in the traditional SPR technology, and is suitable for high-sensitivity biomolecule interaction detection.

The invention discloses a laser frequency stabilization electric control system based on a modulation transfer spectrum, and the system is constructed based on a ZYNQ7030 heterogeneous SoC platform, and integrates laser modulation, signal collection, error extraction, feedback control and man-machine interaction functions. Comprising a sinusoidal modulation chain driven by a high-speed DAC and an electro-optical modulator which are used for realizing laser frequency modulation; the MTS signal acquisition link consists of a photoelectric detector, a low-noise amplifier and a high-speed analog-to-digital converter; feedback control is carried out on the frequency of the laser through the precise digital-to-analog converter and the current source circuit. Meanwhile, the system integrates an air cavity temperature control module, a multi-channel communication interface and a man-machine interaction module, and frequency stabilization and system management are achieved. According to the invention, high-precision and high-stability laser frequency locking based on the rubidium atom absorption spectrum can be realized without depending on an external frequency standard, and reliable frequency reference is provided for applications such as high-precision atom physical experiments, quantum sensing, spectral measurement and the like.