683 results about "Laser frequency" patented technology

The invention provides a high-resolution small-angle measuring device based on laser frequency measurement, which comprises a laser generating device, a reflecting mirror group and a beat frequency measuring module, and is characterized in that a narrow-band interference sheet (3) and a transparent solid medium (4) are fixed on a high-precision horizontal rotating table (5); the fixing positions of the narrow-band interference sheet (3) and the transparent solid medium (4) are axially symmetric and are not parallel to each other by taking the diameter, perpendicular to the light path, of the rotating table as the axis; and when the high-precision horizontal rotating table (5) rotates to cause the frequency change delta f of the measured laser, the variable quantity of the beat frequency is equal to delta f. According to the small-angle measuring device, angle measurement is converted into frequency measurement by means of the high sensitivity of laser frequency to the rotation angle of the transparent solid medium, and the cavity mode frequency and the transmission frequency of the interference piece are synchronously changed by adding the interference piece; the problem that the tunable range of laser frequency is small due to rotation of a transparent solid medium is solved, and continuous measurement of micro angles is achieved.

The invention discloses a Rydberg atom microwave measurement sensitivity improving method based on atom velocity selection, and relates to the field of Rydberg atom microwave measurement, and the method comprises the steps: moving the frequency of probe light to an energy level resonance transition position of cesium atoms from a ground state to an excited state, scanning the frequency of the coupled light within a Rydberg state energy level preset range, and observing an EIT signal; the frequency of the detection light is changed, the detuning amount of the detection light is selected to enable the EIT signal to reach the maximum, and the frequency of the detection light is locked to the frequency corresponding to the maximum position of the EIT signal; meanwhile, a local oscillation field signal generator in the Rydberg atomic microwave sensitivity measurement device is turned on, and corresponding EIT-AT splitting is generated; the frequency of the coupling light is locked to the coupling light laser frequency corresponding to the lowest point of EIT-AT splitting, and the Rydberg atom microwave measurement sensitivity reaches the maximum. The cesium atom speed is screened and controlled, and the signal-to-noise ratio of the measurement signal is improved, so that the measurement sensitivity is improved.

The invention discloses a method and a device for inhibiting laser wavelength temperature drift, relates to laser wavelength measurement and laser frequency stabilization, and belongs to the field of atomic physics and quantum optics. The device comprises a laser output light unit, a high-precision wavemeter monitoring unit and a temperature drift feedback control unit. And measuring a wavelength drift coefficient a of environment temperature T environment-laser wavelength lambda. Measuring a set temperature Tset-laser wavelength lambda and a wavelength control coefficient b; and according to the measured coefficients a and b, calculating to obtain a temperature gradient compensation coefficient c (c = a / b). When the laser works normally, the T environment is collected in real time, and the set temperature Tset of the laser is changed according to the temperature gradient compensation coefficient c and the T environment, so that the laser wavelength temperature drift is inhibited. According to the invention, active suppression of laser wavelength temperature drift is realized by regulating and controlling a temperature gradient compensation coefficient. The device has the advantages of being simple in structure, high in wavelength drift suppression capability, low in energy loss and the like.

The invention provides a common-mode denoising dual-laser frequency measurement ultrahigh-precision small-angle measurement reference device, which comprises a first light path mechanism, a second light path mechanism and a beat frequency measurement module, the first light path mechanism and the second light path mechanism are arranged in parallel, and the light path mechanism comprises a laser generation device, a narrow-band interference sheet, a microprism array and a first annular piezoelectric module. And the components are fixed on a high-precision horizontal rotating table (7). According to the ultrahigh-precision small-angle measurement benchmark device for common-mode noise elimination double-laser frequency measurement, the cavity length is changed by rotating the cavity mirror to cause frequency change, the variable quantity of the angle is converted into the change of the frequency difference of laser output by the two devices, the narrow-band interference sheet is used for assisting adjustment to perform mode selection, the cavity mode change and interference frequency selection are highly synchronous, and the measurement accuracy is improved. According to the invention, mode hopping of the laser output frequency is avoided, continuous tunability of the output frequency along with the rotation angle is ensured, the problem of continuous measurement is solved, and small-angle ultra-high-precision measurement is realized.

A frequency stabilization method and system for tunable light sources based on characteristic curve reconstruction are provided, which relate the field of frequency stabilization technologies of modulation absorption spectrum. A set of frequency stabilization control method and system based on internal modulation absorption spectroscopy of light source is constructed, and a high-precision laser frequency stabilization method under large-amplitude and high-bandwidth frequency modulation based on frequency discrimination curve reconstruction is proposed to solve a problem that it is difficult for micro-probe laser interferometry measurement benchmark to balance large-amplitude and high-bandwidth frequency modulation, and high-precision frequency stabilization, resulting in that it is difficult to obtain high relative accuracy measurement under large-range measurement. Under the large-amplitude and high-bandwidth frequency modulation, a distortion model of the frequency discrimination curve and a distortion correction model are constructed, which is used for feedback adjustment of phase compensation and reconstructing the frequency discrimination curve.

The invention relates to the technical field of laser frequency stabilization control, and discloses a multi-mode laser frequency stabilization error feedback correction system driven by machine learning. The system comprises a multi-modal data acquisition module for acquiring various data to generate a multi-modal time sequence data set; the error feature extraction module is used for extracting an error feature tensor by using a kernel principal component analysis algorithm; the dynamic compensation modeling module is used for constructing a support vector regression model to generate a dynamic compensation strategy matrix; and the feedback control optimization module is used for designing a self-adaptive model prediction control framework to generate a closed-loop correction instruction sequence. In addition, a self-adaptive correction execution module, an error traceability analysis module and an abnormal mode recognition model are further arranged. Through multi-modal data acquisition and analysis and intelligent modeling and control, high-precision laser frequency stabilization is realized, the system can effectively adapt to a complex environment, the stability and reliability of the system are improved, and the system has a wide application prospect in the fields of laser processing, optical communication and the like.

According to the device and the method for synchronously locking the phase and the period of the holographic interference fringes, two sets of locking devices are adopted and are respectively arranged at two ends of a holographic interference exposure field in the same direction as the period of the interference fringes, one set is used for compensating the phase of the interference light field to lock the phase of the interference fringes, and the other set is used for locking the period of the interference fringes. And the other one is used for compensating the output laser frequency of the laser to lock the interference fringe period. According to the interference fringe phase and period synchronous locking method, the problem that the contrast ratio of interference fringes is degraded due to phase and period drift of the interference fringes in the exposure process of a large-aperture holographic grating is solved, and particularly an interference fringe period real-time locking module is used; the problem that the fringe contrast is gradually deteriorated in the periodic direction due to periodic change of interference fringes is effectively solved, and a reliable solution is provided for preparation of the meter-scale large-aperture, high-contrast and high-uniformity holographic grating.

The invention discloses a frequency discrimination curve calibration system, method and device. A frequency locking technology is adopted, the output laser frequency of the seed laser is stably locked on an absorption peak of the atom / molecule absorption cell, and the problem of frequency drift of the seed laser is effectively solved. Meanwhile, two acousto-optic modulators are used for implementing accurate out-of-cavity passive frequency modulation on the seed laser, and the laser frequency is moved to a preset zero-speed frequency point of an optical frequency discriminator and a linear working area edge frequency point from an atom / molecule absorption peak position. In the calibration process, the telescope vertically points to the zenith, and atmospheric echoes with zero Doppler frequency shift are provided as reference. At the moment, the optical frequency discriminator measures and records the transmittance of a preset zero-speed frequency point in the center of the linear working area and the transmittance of an edge frequency point, and a new frequency discrimination curve can be derived based on the linear hypothesis of the frequency discrimination curve.

The invention provides a mode-hopping-free large-range continuous tunable external cavity semiconductor laser, which comprises a laser diode (1), a collimating lens (2), a polarization splitting prism (3), a narrow-band interference sheet (4), a prism-type super-strong-level reflective film (5) and a piezoelectric module (6), the laser diode (1), the collimating lens (2) and the polarization splitting prism (3) are sequentially arranged on a light path, and the narrow-band interference sheet (4), the prism-type super-strong-level reflective film (5) and the piezoelectric module (6) are bonded together. The rotation axis is located on the light path of the laser and coincides with the rear surface of the piezoelectric module (6). According to the mode-hopping-free large-range continuous tunable external cavity semiconductor laser, the sensitivity of the laser frequency to the rotation angle of the narrow-band interference sheet is utilized, and the angle and the cavity length of the interference sheet are changed at the same time, so that the transmission peak center frequency of the interference sheet and the specific cavity mode frequency are highly synchronized along with the change of the angle; according to the laser, mode hopping of the laser output frequency is avoided, and continuous tunability of the output frequency along with the rotation angle of the cavity mirror is guaranteed.

The invention discloses a laser frequency stabilization system based on Faraday anomalous dispersion atomic filtering, which is used for carrying out frequency stabilization on phase modulation multi-sideband laser, and comprises a frequency doubling laser unit which is configured to comprise a fundamental frequency seed light source, an electro-optical modulator, a fundamental frequency amplifier and a frequency doubling crystal; the light splitting module unit is configured to split the frequency doubling light into a main output light path and a monitoring light path; the atomic optical rotation filter is located on the monitoring light path and is configured to maintain the purity of the frequency-stabilized laser spectrum through purification treatment under the control of the axial magnetic field and the temperature; the frequency stabilization unit is configured to be a frequency stabilization light path and a servo system, and the frequency stabilization light path is used for obtaining laser frequency information and generating an error signal; the servo system is used for controlling the frequency of the fundamental frequency seed light source according to the error signal feedback. According to the laser frequency stabilization system provided by the invention, the spectrum purification and frequency stabilization precision can be improved, so that high-frequency stability locking is realized.

The invention relates to a formamidine thiosulfate second-order nonlinear optical crystal and preparation and application thereof, the chemical formula of the crystal material is [CH (NH2) 2] 2SO3S, the molecular weight is 203.27, the crystal material belongs to an orthorhombic crystal system, the space group is P212121, the unit cell parameter is # imgabs 0 # alpha = beta = gamma = 90 degrees, Z = 4, and the unit cell volume is # imgabs 1 #. Under 1064nm laser irradiation, the frequency doubling intensity of the powder is about two times that of monopotassium phosphate crystals, and phase matching can be realized. In addition, the crystal material has a wide light transmission wave band, the ultraviolet absorption cut-off edge is 253 nm, the optical band gap is 4.90 eV, and the crystal material is easy to grow. The wavelength range of the coherent light source can be expanded by using optical frequency conversion technologies such as second harmonic generation and optical parametric amplification. Therefore, the crystal material has important application value in the fields of laser frequency conversion, photoelectric information storage and the like.

The invention discloses a full-locking integrated microcavity optical comb based on coherent population trapping spectral lines, and belongs to the technical field of integrated microcavity optical combs. The full-locking integrated micro-cavity optical comb comprises a laser generation module, a frequency reference subsystem and a micro-cavity optical comb system. The laser generation module is used for generating two paths of laser, the frequency reference subsystem modulates one path of laser, a modulated optical signal is emitted into the atomic gas chamber system, and after transmission light is demodulated and subjected to phase-locked amplification processing, an optical frequency signal and a microwave signal which are locked to an atomic spectral line are obtained; and the optical frequency signal is fed back to the laser generating module to realize optical frequency locking. And the microcavity optical comb system adopts a microwave signal generated by the frequency reference subsystem as a frequency reference, and modulates the other path of laser to serve as pump light to enter the optical microcavity, so that optical comb output of a soliton state in the optical microcavity is realized. According to the invention, a single quantum system is taken as a reference, the problem of full locking of the micro-cavity optical frequency comb is effectively solved, and the system integration degree is relatively high.

The invention belongs to the technical field of laser application, and discloses a feedback type multi-wavelength optical fiber laser shaping and amplifying system which comprises a laser light source, an optical fiber frequency doubling device and a laser shaping and amplifying mechanism. The laser shaping and amplifying mechanism comprises a laser shaping and amplifying branch or more than two laser shaping and amplifying branches which are arranged in sequence; the laser shaping and amplifying branch comprises a feedback type laser shaping device and an optical fiber gain amplifying device; the optical fiber frequency doubling device is used for carrying out selective frequency conversion on fundamental frequency laser output by the laser light source; the feedback laser shaping device is used for carrying out waveform shaping on target wavelength laser; and the optical fiber gain amplification device is used for performing gain amplification on the shaped target wavelength laser. The device has the advantages of being simple in structure and high in expansibility, is suitable for being used in an optical fiber laser application system, and is used for modulating laser frequency, improving multi-wavelength laser waveforms and improving multi-wavelength laser output energy.

The invention provides a device and a method for generating a Lammer-type hot atomic beam light clock based on periodic pulses. The device comprises a pulse laser, a laser frequency stabilization system, an optical switch, a Laammer type hot atom chamber and a laser detection feedback system. Wherein the pulse laser is used for emitting first laser, and the pulse time is nanosecond magnitude. The laser frequency stabilization system is used for carrying out pre-frequency stabilization on the first laser to obtain second laser, and the second laser is conveyed to the Laammer type hot atom chamber through the optical switch; the switching period of the optical switch is set to be microsecond magnitude; the lamplug type hot atom chamber is used for outputting a lamplug type hot first atom beam; and the laser detection feedback system is used for detecting the first atomic beam, feeding back and controlling the pulse laser, locking the frequency of the pulse laser on a transition spectral line of atoms, and obtaining a hot atomic beam light clock. According to the invention, the interaction time of laser and atoms can be controlled, and the utilization rate of the atoms of the Lammer-type hot atomic beam light clock can be improved.

The invention discloses a millimeter wave signal phase noise testing method based on ultra-stable laser, and the method comprises the steps: generating the ultra-stable laser through employing a common-cavity Brillouin laser frequency stabilization technology, taking the ultra-stable laser as a carrier wave, and carrying out the double-sideband modulation of a to-be-tested millimeter wave signal; frequency shifts of the two sidebands are different, the sideband with high frequency has more downward frequency shifts, the sideband with low frequency has less downward frequency shifts, the generated common-cavity Brillouin laser and the double-optical-sideband pumping laser are coupled and separated to obtain upper and lower double-sideband optical signals with different frequency intervals, and then beat frequency and mixing frequency are performed to generate an intermediate frequency signal with MHz magnitude; the noise characteristic of the intermediate frequency signal directly carries the phase noise of the to-be-tested signal, and the phase noise analyzer carries out noise spectrum density analysis and quantitative evaluation on the intermediate frequency signal to complete the phase noise test of the to-be-tested millimeter wave signal. The collaborative optimization problem that the reference source stability, the system noise and the to-be-tested signal noise are difficult to separate in the ultrahigh frequency signal noise test is solved.

The invention discloses an on-line detection method for volatile organic compounds in waste gas, and belongs to the field of waste gas emission monitoring, the detection method comprises the following specific steps: I, starting a quantum cascade laser frequency comb of a middle infrared band, calibrating various parameters of the quantum cascade laser frequency comb, and ensuring to cover a characteristic absorption area of the volatile organic compounds in the waste gas; iI, inputting the waste gas into a gas detection chamber through a sampling pipeline, monitoring the state of the waste gas in real time, and dynamically adjusting the conditions of the gas detection chamber according to various collected signals; the device can capture instantaneous fluctuation of waste gas concentration in real time, meets the high-speed dynamic emission monitoring requirement, has extremely high coherence and narrow linewidth, can analyze tiny spectral line differences which cannot be distinguished by a traditional spectrograph, remarkably improves the detection precision and the recognition capability, ensures that a measurement result still keeps consistency and high reliability under different working conditions, and is suitable for large-scale popularization and application. The signal-to-noise ratio is obviously improved, the power drift is reduced, and long-time stable operation is realized.

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 chip atom vector magnetometer based on a topological posture surface emitting laser. The device is characterized by comprising a topological posture PCSEL, a beam shaping unit, a polarizer, a quarter-wave plate, a voltage-controlled laser polarization rotator, an atomic gas chamber, a Wollaston prism, a dual-channel photoelectric detector, a filter module, a laser frequency stabilization unit, a precession signal modulation and demodulation module and a laser polarization and Larmor magnetic field direction adjustment module, the system comprises a two-dimensional Larmor magnetic field coil, a servo feedback module, a direct digital frequency synthesis module and a high-stability crystal oscillator. The topological posture laser is used for the chip atom vector magnetometer, magnetic vector parameter measurement which is more immune to temperature fluctuation and more excellent in performance is innovatively achieved for an external magnetic field, complete information of the vector magnetic field can be measured at the same time, and the chip atom vector magnetometer can be used for the fields of material defect detection, mineral oil and gas exploration, underwater magnetic target positioning and the like.

The invention provides a laser removing method for a damaged coating on the surface of a metal base material and application of the laser removing method. The laser removing method comprises the following steps that the thickness and the shape of a damaged coating on the surface of a metal base material are obtained, working parameters of a laser device are determined, laser spots generated by the laser device are concentrated on the damaged coating area on the surface of the metal base material, and laser removing treatment is conducted; wherein the working parameters comprise laser power, laser pulse width, line spacing and laser frequency. According to the method, accurate control over the removing process can be achieved, the working parameters of the laser device are adjusted based on the parameters of the damaged coating, the cleaning depth and range can be accurately controlled, customized cleaning can be conducted according to different requirements when the damaged coating is removed, the damaged coating can be completely removed, and excessive cleaning or damage can be avoided. And for some thicker metal coatings or coatings which are difficult to remove at one time, the laser cleaning can be carried out repeatedly, and the damage to the base material is avoided.

The invention discloses an ultra-stable laser digital automatic locking system and an automatic locking method, and relates to the technical field of ultra-stable laser frequency automatic locking. The ultra-stable laser digital locking system comprises a frequency locking circuit module and a frequency locking laser module. Specifically, according to the system, temperature locking and frequency locking are integrated in one frequency locking circuit module; the temperature of an optical reference cavity of the frequency locking laser module and the working frequency of the frequency locking laser module are simultaneously locked through an FPGA and a matched temperature analog-to-digital conversion unit, a frequency locking analog-to-digital conversion unit, a signal monitoring analog-to-digital converter, a temperature control unit and a frequency control unit. Compared with a digital-analog hybrid circuit in a traditional scheme, the number of components in the system is greatly reduced, the anti-interference capability is enhanced, and the adjustment precision and the stability are obviously enhanced.

The invention relates to a self-calibration atomic wavelength meter. The self-calibration atomic wavelength meter comprises a saturated absorption spectrum light path for locking a detection laser frequency on a cesium atom energy level transition line based on a saturated absorption spectrum; the double-peak spectrum light path scans the frequency of a coupled laser after the frequency of the detection laser is locked by a saturated absorption spectrum, and when the detection laser and the coupled laser jointly act on alkali metal atoms and are subjected to resonance excitation, an electromagnetic induced transparency effect is generated; when the detection laser is detuned, the detection laser and the combined laser jointly act on the alkali metal atoms to generate non-resonance excitation, a double-peak EIT spectrum with Doppler frequency shift is generated, and the wavelength measurement of the current detection laser can be completed based on the linear relation between the double-peak spectrum interval and the detuning amount of the detection laser. In addition, the double-peak spectrum interval is compared with the atomic energy level transition frequency, the difference between the double-peak spectrum interval and the atomic energy level transition frequency serves as an error signal to be fed back to the control end of the detection laser, the frequency of the detection laser is tuned to the reference frequency standard, and calibration of the wavemeter can be achieved.

The invention provides a pulse laser frequency control device and method, and belongs to the technical field of pulse fiber lasers. Comprising a frequency measurement module used for acquiring the frequency of a first external control signal; the frequency selection and frequency division module generates and outputs a seed frequency signal and a frequency division coefficient according to the frequency of the first external control signal obtained by the frequency measurement module; the frequency generation module is used for receiving the seed frequency signal output by the frequency selection and division module and outputting a seed frequency trigger signal; the pulse generation module is used for acquiring the seed frequency trigger signal output by the frequency generation module and providing a seed pulse signal for the seed driver, and the seed driver outputs pulse light according to the input seed pulse signal; the current control module is used for receiving a second external control signal and providing a current driving signal for each pump driver; and the RAM controller is used for receiving a third external control signal and the frequency division coefficient output by the frequency selection and frequency division module, and controlling the acousto-optic modulator to work.

The invention discloses an in-phase and quadrature demodulation phase modulation optical heterodyne frequency stabilization system for inhibiting an RAM (Random Access Memory), which relates to the technical field of laser frequency stabilization and comprises a laser, an electro-optical modulator, a circulator, an optical resonant cavity, a photoelectric detector, a phase shifter, a frequency mixer, a summator, a low-pass filter, a signal generator and a signal acquisition and processing module. Laser emitted by the laser is modulated by the electro-optical modulator and then enters the circulator, the circulator receives reflected light of the optical resonant cavity and emits the reflected light to the photoelectric detector, and all error signals are obtained through the frequency mixer and the low-pass filter. All error signals are added through an adder and then are input into a signal acquisition and processing module for feedback, so that the frequency of laser emitted by the laser is locked to the resonant frequency of the optical resonant cavity; according to the frequency stabilization system, a plurality of modulation frequencies are introduced to modulate the laser phase in the electro-optical modulator, so that the influence of RAM noise on frequency stabilization is suppressed.

The invention discloses a plug-and-play Rydberg atom preparation device based on a three-photon absorption method, which comprises a laser generator, a laser input module, a laser detector, three frequency stabilization modules and a temperature and humidity control module, and is characterized in that the laser generator is used for preparing laser to be measured; the input module is used for transmitting and introducing laser; the saturated absorption frequency stabilization module, the electromagnetic induction transparent frequency stabilization module and the heating electromagnetic induction transparent frequency stabilization module all adopt a glass bonding technology to build frequency stabilization light paths; the laser detection device is used for detecting laser lines in the saturation absorption frequency stabilization module, the electromagnetic induction transparent frequency stabilization module and the heating electromagnetic induction transparent frequency stabilization module and locking the laser frequency corresponding to the specific wavelength. According to the invention, a frequency-stabilized light path is built by using a glass bonding technology, so that devices and the size are greatly reduced, and the integration level of a light path system is greatly improved; moreover, the degree of freedom of device adjustment can be reduced, and the reliability and stability of a laser frequency stabilization optical path are effectively improved.

The invention belongs to the technical field of quantum precision measurement, and particularly discloses a frequency stabilization system and a frequency stabilization method for an external cavity semiconductor laser. The system comprises a saturated absorption spectrum module, a wavelet peak searching module, a modulation and demodulation module, a bias amplification module and a switch module, wherein the saturated absorption spectrum module outputs an electric signal of a saturated absorption spectrum; under the control of the frequency locking instruction, the wavelet peak searching module outputs a target bias voltage signal corresponding to the locking frequency based on the electric signal; the modulation and demodulation module performs signal modulation and demodulation based on the electric signal and a reference signal corresponding to the locking frequency to output a modulation signal and a demodulation signal; and the bias amplification module performs superposition and amplification processing on the modulation signal, the demodulation signal and the target bias voltage signal, and outputs a target superposition signal to a PZT modulation port of the laser, so that the output laser freely operates on the locking frequency. According to the invention, the laser is not liable to generate mode hopping in the frequency locking process, the whole frequency stabilization system is more stable, the structure is simple, and the cost is low.

The invention relates to an aminoguanidine oxalate second-order nonlinear optical crystal material and preparation and application thereof, the chemical formula of the crystal material is (CN4H7) + (C2O4H)-, the crystal material belongs to a monoclinic system, the space group is P21, the cell parameters are # imgabs0 # and # imgabs1 #, alpha is equal to 90 degrees, beta is equal to 95-100 degrees, gamma is equal to 90 degrees, and Z is equal to 2. The powder frequency-doubled effect of the nonlinear optical crystal (CN4H7) + (C2O4H)-disclosed by the invention under the irradiation of 1064nm laser is about 1.0 time of that of a KH2PO4 (KDP) crystal, and phase matching can be realized. In addition, the crystal material has the advantages of being short in ultraviolet absorption cut-off edge (290 nm), easy to grow and the like, and has important application value in the photoelectric conversion fields of stereolithography, solid-state lasers, optical communication, optical parametric amplifiers, optical parametric oscillators, laser frequency converters and the like.

The embodiment of the invention provides a rubidium atomic clock based on a velocity grating spectrum and an implementation method, and the method comprises the steps: enabling a multi-frequency coherent laser source to emit a laser signal containing the velocity grating spectrum, and dividing the laser signal into two paths through a polarization splitting prism; the reflected light beam enters the laser frequency stabilization module to realize laser frequency stabilization; a transmission light beam enters the rubidium bubble through the lens group to interact with rubidium atoms; the photoelectric tube detects a transition spectral line, converts the transition spectral line from an optical signal into an electric signal and transmits the electric signal to the lock-in amplifier for demodulation; the integral amplification module converts the demodulated direct-current voltage into linear increasing voltage and transmits the linear increasing voltage to the crystal oscillator; the crystal oscillator generates an initial microwave signal and generates a microwave signal corresponding to the 87Rb atom through the frequency synthesizer; and the phase frequency modulation module modulates the microwave signal to obtain an error signal and transmits the error signal to the microwave resonant cavity so as to adjust the electromagnetic field according to the error signal to stably lock the rubidium atomic clock. The method is used for achieving the effect of improving the stability of the rubidium atomic clock system.

The invention discloses a de-bonding device, a bonding method and a de-bonding method. The de-bonding device comprises a laser source for providing infrared laser for performing de-bonding through a carrier silicon wafer; the galvanometer is used for transmitting the infrared laser to the first surface of the carrier silicon wafer and irradiating a bonding layer through the carrier silicon wafer, and the galvanometer is used for de-bonding the carrier silicon wafer and a device according to a target scanning speed by adjusting the laser frequency, and the device is bonded on the second surface of the carrier silicon wafer through the bonding layer, and a laser spot generated by a next pulse corresponding to the target scanning speed is next to a laser spot generated by a previous pulse and is not overlapped with the laser spot generated by the previous pulse. According to the invention, nondestructive de-bonding can be carried out on the permanently bonded silicon wafer, so that the separated silicon wafer can be reused, subsequent processing is facilitated, the permanent bonding de-bonding efficiency can be improved, and the overall size of de-bonding equipment is reduced.

The invention relates to the technical field of laser system control, and discloses a laser frequency locking system multistage PID parameter regulation and control method based on deep learning, and the method comprises the steps: obtaining an error signal time sequence of a PDH laser frequency locking system; outputting a frequency locking state score and a fast and slow double-loop PID parameter through a deep learning model; judging whether the frequency locking state score and the fast and slow double-loop PID parameters meet corresponding preset conditions or not; if the frequency locking state score and the fast and slow double-loop PID parameters do not meet the corresponding preset conditions, iteratively optimizing the deep learning model until the frequency locking state score and the fast and slow double-loop PID parameters meet the corresponding preset conditions; and the optimized deep learning model outputs fast and slow double-loop PID parameters. According to the invention, online adaptive reasoning and closed-loop optimization of fast and slow double-loop multistage PID control parameters can be realized, and the intelligent level and the capability of adapting to complex working conditions of a PDH laser frequency locking system are improved.

The invention provides a frequency stabilization device and method for any detuning frequency of a laser. The frequency stabilization device comprises a pumping laser atomic resonance point frequency stabilization structure, a cavity length locking structure of an optical resonant cavity and a frequency stabilization structure for detecting any detuning frequency of the laser. The frequency of the pumping laser is stabilized at an atomic resonance point through a saturated absorption frequency stabilization method, and then the cavity length of an optical resonant cavity is locked by taking the frequency-stabilized pumping light as a reference. Two modulation signals with different frequencies are superposed by adopting Bias Tee, biphase modulation is applied to detection laser through an electro-optic phase modulator, a stable error signal is demodulated while a modulation sideband is generated, then a first-order sideband is locked on a longitudinal mode, close to an optimal detuning point, of an optical resonant cavity, and a second-order sideband is locked on a longitudinal mode, close to the optimal detuning point, of the optical resonant cavity. Continuous frequency tuning in the laser frequency stabilization process is detected by adjusting the first-order sideband frequency. According to the invention, the size and the cost are reduced.