434 results about "Laser frequency" patented technology

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 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 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 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 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 narrow-linewidth single-frequency laser frequency stabilization system and method based on a Gaussian filter, and the system employs the Gaussian filter to reduce the optical power of single-frequency laser, and employs the frequency selection characteristic of the Gaussian filter, the frequency spectrum of the single-frequency laser is a single narrow peak, and the frequency stability of the single-frequency laser is improved. When laser frequency passes through a designed Gaussian filter (the fluctuation range of a frequency-stabilized laser source is only on the left side of the center frequency of the Gaussian filter), laser signals can be reduced according to a Gaussian function rule, and along with frequency change, attenuation degrees are different and monotonically change, so that output optical power is different, and the output optical power is changed. And the optical power is compared with the optical power of a preset frequency stabilization target (a half-high point on the left side of a Gaussian filter) to obtain the deviation of the laser source relative to the target frequency stabilization frequency, so that the laser frequency is correspondingly adjusted to achieve the frequency stabilization purpose. The high-sensitivity optical power detection is realized, the response speed and the frequency stabilization precision of the system are improved, and the system is simple in structure and low in maintenance cost.

The invention relates to the technical field of atomic frequency standards, in particular to a rubidium cold atom gas chamber-based two-photon transition optical frequency standard device, which comprises a two-photon transition clock laser system, a rubidium cold atom gas chamber, a cooling laser system, a sputtering ion pump and a rubidium source, wherein the two-photon transition clock laser system comprises a laser generation modulation light path, a laser power stabilization light path and a laser frequency control light path; the rubidium cold atom gas chamber is arranged behind the Glan-Taylor prism; the cooling laser system comprises a cooling laser, a second isolator, a second polarization beam splitter, a pumping light path, a re-pumping light path and a detection light path; the sputtering ion pump is connected with the rubidium cold atom gas chamber; and the rubidium source is connected with the rubidium cold atom gas chamber. The two lasers are utilized to obtain the two-photon transition signal, so that the rubidium atom two-photon transition light frequency standard with high stability is obtained, and the intensity of the two-photon transition fluorescence signal is improved.

The invention provides a temperature compensation method and device for laser frequency doubling, electronic equipment and a storage medium. The method comprises the steps that the initial temperature of a frequency doubling crystal of a frequency doubling laser is determined according to the power of input fundamental frequency light; adjusting the initial temperature, and determining a target temperature corresponding to the maximum value of the frequency-doubled optical power output by the frequency-doubled laser; according to the invention, active following compensation is carried out on the temperature of the frequency doubling crystal, and the temperature of the frequency doubling crystal is controlled at the target temperature, so that the active following compensation is carried out on the temperature of the frequency doubling crystal, thereby enabling the frequency doubling laser to maintain high output power, and further improving the frequency doubling efficiency of the crystal. Therefore, the laser frequency multiplier can quickly reach a steady state in the power switching process, and accurate dynamic control of the laser frequency multiplication system is realized.

A lidar system for simultaneously measuring the column concentration of methane and the profile concentration of water vapor in the atmosphere is disclosed. The device includes a laser emission module: a 1645nm monoline seed laser, a 1645nm offline1 seed laser, a 1645nm offline2 seed laser, a 1064nm pump laser, a laser frequency-locking module, an optical parametric oscillator, a frequency doubling module, and emitting optical components; an echo receiving module: an integrating sphere module, an optical receiving telescope assembly, a beam splitter, filter assembly 1, filter assembly 2, photodetector 1, and photodetector 2; and a data acquisition and processing module. This invention utilizes the frequency doubling relationship between the absorption lines of methane and water vapor to simplify the complex structure of a dual-band, multi-wavelength laser. It employs seed-injected optical parametric oscillator technology to obtain a high-frequency stable 1645nm fundamental frequency light, which is then frequency-doubled to obtain an 822nm laser. The profile concentration of water vapor and the column concentration of methane in the atmosphere can be measured using differential absorption lidar (DIAL) and integral path differential absorption (IPDA) technologies, respectively.

The invention discloses a phi-OTDR vibration demodulation method based on double-segment average phase difference, belongs to the technical field of optical fiber sensing vibration demodulation, and solves the problems that in the prior art, phase demodulation is greatly influenced by phase noise such as laser frequency drift, the phase extraction precision and the signal-to-noise ratio are low due to random fluctuation of a phase curve, and the signal-to-noise ratio is low. And phase solving errors are easily caused by interference fading points. According to the method, through band-pass filtering, moving differential positioning, I / Q demodulation after reference point selection, unwinding, mean value removal and calculation of the average phase difference of two segments, the phase variation corresponding to vibration is extracted, and the demodulation precision is improved. Through the two-segment average phase difference method, the influence of phase noise and interference fading is suppressed, and the signal-to-noise ratio and stability of phase demodulation are improved; the frequency modulation pulse is replaced to break through restrictions of spatial resolution and sensing distance, high sidelobe suppression can be realized without windowing the NLFM pulse, the signal-to-noise ratio is not damaged, and the vibration detection positioning accuracy is improved.

The invention relates to a Rydberg atomic communication receiving system and method based on AT split peak value analysis, and belongs to the technical field of quantum communication. The system comprises a detection laser, a coupling laser, an AOM / EOM, a function generator, a high-frequency signal generator, a cesium atom gas chamber, a photoelectric detector, a lock-in amplifier, a data acquisition module and a microwave signal output module. The AOM / EOM modulates the frequency of the detection laser; the microwave signal output module generates an AM modulation microwave signal and transmits the AM modulation microwave signal to the cesium atom gas chamber, so that the target Rydberg state atoms generate an AT splitting effect to calibrate system parameters; the photoelectric detector and the lock-in amplifier obtain a first harmonic component based on the transmission light. During communication, the system is arranged in a microwave electric field received by communication, and the data acquisition and processing module outputs AM modulation microwave signals received by the recovered cesium atom gas chamber based on calibrated system parameters and phase locking. The method solves the problem of signal distortion existing in EIT-AT direct communication transmission and the problem of tedious operation of a heterodyne method.

The invention relates to a dual-frequency laser interference measurement system phase resolving method based on a digital phase-locked loop. According to the method, a reference signal is subjected to photoelectric conversion to generate a sampling clock, and a measurement signal is sampled according to the sampling clock. Phase data can be obtained by analyzing the sampled measurement signal. The technology has the advantages that the influence of laser frequency difference fluctuation is eliminated, high-precision real-time calculation of the phase of the double-frequency laser interferometer is realized, the calculation process is remarkably simplified, and resource occupation is reduced.

The invention belongs to the technical field of biochemical sensing, and particularly relates to an optical-mechanical gas sensor based on a graphene annular microcavity. According to the sensor, a high-sensitivity and low-noise gas detection platform is constructed by combining a high-quality-factor annular microcavity with single-layer graphene; the sensor excites the boundary of the cavity to generate optical mechanical vibration by utilizing radiation pressure generated by propagation of photons in the microcavity; a phonon laser signal with stable frequency and extremely low noise is formed under the continuous action of the pump light; after target gas molecules are adsorbed by graphene, effective mass change of the microcavity is caused, measurable deviation of phonon laser frequency is caused, and therefore real-time high-sensitivity detection of gas concentration is achieved. The optical-mechanical interaction mechanism, the two-dimensional material gas adsorption characteristic and the microcavity optical regulation and control technology are fused, and the device has the advantages of being high in response speed, low in detection limit, easy to integrate and the like and is suitable for multiple scenes such as environment monitoring, biochemical analysis and industrial safety.

The invention provides a laser frequency stabilization device and method based on optical frequency shift, and relates to the field of laser frequency stabilization, and the device comprises a first slave laser, a first frequency stabilization system, a second slave laser, a second frequency stabilization system, a master laser, an acousto-optic modulation module, and a phase-locked frequency stabilization device. The first slave laser is used for emitting first laser of a first wavelength; the main laser is used for emitting third laser with a second wavelength; the first frequency stabilization system is used for locking the first laser according to the first laser to obtain first frequency-stabilized laser; the second slave laser is used for emitting second laser with the first wavelength; the second frequency stabilization system is used for locking the second laser to obtain second frequency-stabilized laser; the acousto-optic modulation module is arranged between the first slave laser and a light path of the phase-locked frequency stabilization equipment; and the phase-locking frequency stabilization equipment is used for receiving the first frequency stabilized laser and the second frequency stabilized laser and carrying out frequency locking on the third laser according to the first frequency stabilized laser and the second frequency stabilized laser. According to the invention, the modulation transfer spectrum and the optical frequency shift can be combined to complete frequency locking of the laser.

The invention relates to the technical field of magnetometers, and discloses a magnetic sensor system based on free induction attenuation and a use method thereof. The sensor system comprises a laser generator, an atomic gas chamber, a strong magnetic generator, a polarizer, a polarization analyzer and a first light detector, a light splitting device is arranged between the laser generator and the atomic gas chamber, laser emitted by the laser generator can be split into a first part of laser and a second part of laser, the first part of laser enters the atomic gas chamber, and the second part of laser enters the atomic gas chamber; and enabling the second part of laser to enter a second optical detector. Once the frequency of the laser generated by the laser generator changes, the proportion of the first part of laser to the second part of laser changes, and the feedback adjustment module feeds back and adjusts the laser generator according to the detection result of the second optical detector, so that the laser emitted by the laser generator is the laser with the preset frequency. Therefore, the laser emitted by the laser generator can be quickly and precisely adjusted, and the detection precision of the whole magnetic sensor system is further improved.

The invention discloses a three-light atom spectral line frequency locking system for a rubidium atom Rydberg microwave electric field meter, and the system comprises a 780nm laser, a 1260nm laser, a 776nm laser, a saturated absorption spectrum detection system, an EIT detection system, an EIA detection system, a saturated absorption spectrum frequency locking system, an EIT frequency locking system, and an EIA frequency locking system. A three-photon excitation scheme is adopted to replace a traditional two-photon excitation scheme, the size of the used laser is greatly reduced, and the output laser frequency and power are stable; compared with the existing PDH frequency locking method or laser self-operation frequency locking method, the frequency locking method combining the SAS spectrum, the EIT spectrum and the EIA spectrum has the advantages that the laser frequency locking time is greatly prolonged; the atomic spectral line three-light modulation method with the unified common modulation frequency is adopted, the frequency locking complexity of the three-light Rydberg system is fully reduced, and the method has higher popularization practicability.

The present invention proposes a multimode laser frequency comb device and a degenerate multimode control method. The device includes a diamond crystal, an optical frequency degeneration module, and a degeneracy control module. Based on the multimode laser frequency comb device, the present invention applies stress to the diamond crystal according to the degenerate multimode control method, regulating the lattice constant of the diamond crystal, thereby regulating the degeneracy of Raman vibrations and controlling the optical frequency degeneration mode. This converts an existing single-mode laser comb into a multimode laser comb output. This can generate a multimode optical frequency comb consisting of a single mode or multiple single-mode frequency combs with spectral width spacing. This multimode optical frequency comb has the advantages of wide wavelength coverage, large spectral spacing, and multiple spectral width spacings that are tunable.

This invention provides a fast frequency closed-loop control method and system for an alkali metal atomic magnetometer laser, comprising: setting the laser current and laser temperature, calculating and obtaining the laser frequency closed-loop control signal SigX; and controlling the laser frequency based on the offset value of the frequency closed-loop control signal SigX and the correlation function f(I) = φ(I, SigX) between the current value and SigX. X The process involves calculating and obtaining the current adjustment value ΔI0, which is then directly applied to the laser current. The difference between the current adjustment value I1 and the set value I0 is calculated as ΔI1. Based on the correlation function f = φ(f(I), f(T)), the temperature change ΔT1 corresponding to the current change ΔI1 is calculated. This temperature adjustment ΔT1 is then applied to the laser temperature. By adjusting the laser temperature to T1, the laser current value is changed back from the adjustment value I1 to the initial set value I0. This invention addresses the problem in existing technologies where using laser current as a feedback signal for closed-loop control of laser frequency easily affects the laser's performance and consequently its lifespan.

The present application relates to the technical field of laser frequency stabilization, and discloses a method for calculating the frequency discrimination slope of a PDH frequency stabilization system, comprising the following steps: obtaining the waist position and size of an incident light beam, the waist position and size of a resonant cavity, and the loss and reflectivity of the resonant cavity; determining whether the waist position and size of the incident light beam match the resonant cavity; and then calculating the frequency discrimination slope through different formulas according to the matching of the waist position and size of the incident light beam and the waist position and size of the resonant cavity, which is simpler, and the parameters of each formula are easy to obtain, with high calculation efficiency and high accuracy.

The invention provides a frequency modulation laser ranging and vibration measurement common-path design method, which belongs to the technical field of laser measurement and comprises a measurement light path, an auxiliary light path and a calibration light path. The measuring light path comprises a single-frequency laser and a tuning continuous wave laser, beam combination, modulation and beam splitting of measuring light beams are achieved through components such as a coupler, a circulator, an acoustic optical modulator, a wavelength division multiplexer and a collimating lens, and finally signals are received by a photoelectric detector. The auxiliary optical path adopts a Mach-Zehnder interferometer structure, and uses an optical fiber disc to generate an optical path difference for auxiliary measurement. The calibration light path accurately calibrates the laser frequency through an etalon and a photoelectric detector. The design effectively improves the integration level, stability and measurement precision of the system through a common-path structure, and is suitable for high-precision laser ranging application.

The invention discloses an in-ring and out-ring matched single-arm locking system and method, and the method comprises the following steps: starting laser from a spacecraft A, and transmitting the laser to a spacecraft B and a spacecraft C; light transmitted to the spacecraft B and the spacecraft C through link delay is subjected to weak light phase locking and then returns; the returned laser is converged with non-delayed light of the spacecraft A after being subjected to link delay again; the converged light returned from the spacecraft B is fed back to the spacecraft A for in-loop suppression after passing through a feedback controller; and the converged light returned from the spacecraft C is subjected to out-of-loop phase output. According to the invention, a single-arm locking system with in-ring and out-ring matching is constructed by selecting a proper out-ring measurement point and adopting an in-ring suppression and out-ring measurement method. The effects that the laser frequency noise can be remarkably suppressed within the full-scientific frequency band range (0.1 mHz-1 Hz), and gravitational wave signals can be amplified while noise of other technologies is suppressed are achieved.

The invention provides an organic eutectic crystal with a pi-conjugate plane structure and application of the organic eutectic crystal. The molecular formula of the organic eutectic crystal is C88H104F12N8O16, the molecular weight of the organic eutectic crystal is 1757.79, and the cell parameters of the organic eutectic crystal are as follows: a is equal to 26.7952 (16), b is equal to 26.7952 (16), and c is equal to 11.9585 (11). The alpha is 90 degrees, the beta is 90 degrees, the gamma is 90 degrees, and the V is 8586.0 (13) 3. The organic eutectic crystal provided by the invention not only can meet the requirement of a blue light band CPL device by strong circular polarization emission at 468 nm, is suitable for the fields of three-dimensional display, encryption and anti-counterfeiting and the like, provides a space for regulating and controlling the light-emitting wavelength and the glum value, but also is suitable for the fields of laser frequency conversion devices, nonlinear optical sensors and the like due to the strong SHG characteristic of the eutectic crystal, and has a wide application prospect. Compared with a traditional inorganic SHG material, the organic eutectic structure has the advantages of being easy and convenient to prepare, light in weight, high in designability and the like.

The application discloses an anti-interference pulse laser frequency division multiplexing optical coding wireless communication system and method, provides an optical wireless communication system based on pulse laser, and realizes an anti-interference pulse laser frequency division multiplexing optical coding communication method. Relying on the convergence effect of the light collector, a stable and anti-interference system receiving end is realized, the anti-interference capability of the whole system is realized through a pulse laser source and a multi-channel light splitting module, the utilization rate of the spectrum in the system communication process is improved, and the pulse laser transmission of frequency division multiplexing is realized.

The utility model relates to the technical field of laser application, in particular to a laser frequency stabilization device based on an etalon frequency measurement technology, which comprises a laser emission unit, a frequency detection unit, a frequency stabilization laser output end and a master control adjusting unit, the frequency detection unit comprises an optical splitter, an optical attenuator, a first photoelectric detector, an etalon and a second photoelectric detector. An etalon in the frequency detection unit is used as a frequency reference, an optical attenuator is arranged to reduce temperature rise and improve precision, a first photoelectric detector and a second photoelectric detector are used to provide a frequency measurement error signal and a reference signal, and the master control adjustment unit is used to carry out analysis and calculation according to the error measurement signal and the reference signal. And the laser emitting unit adjusts the laser frequency according to the adjusting signal, so that the frequency stabilization adjustment of the laser is realized.

The application discloses a laser frequency modulation interferometer phase measurement error correction method, system and device, relates to the field of photoelectric precise measurement technology, and comprises the following steps: acquiring a laser frequency modulation interferometer quadrature phase measurement signal, and expressing the quadrature phase measurement signal by using a standard ellipse equation; defining variables in Kalman filtering, discretizing and normalizing the equation; acquiring a time update equation of a Kalman filter, and measurement noise covariance and process noise covariance according to the normalized standard ellipse equation; acquiring a phase measurement update equation; introducing four points in the vicinity of four axes of the ellipse to perform iterative fitting; initializing iteration by rotating the ellipse through scanning laser temperature; and correcting the quadrature phase measurement signal by using posterior estimation. According to the conversion relationship between the quadrature signal characteristics and the ellipse parameters, the unequal amplitude and the bias of the quadrature signal are corrected in real time, so that the correction of the nonlinear error of the phase measurement is finally realized.

The application relates to the technical field of magnetometers, and discloses a magnetic force sensor system based on free induction decay and a use method thereof.The sensor system comprises a laser generator, an atomic gas chamber, a strong magnetic field generator, a polarizer, an analyzer, and a first light detector, and a light splitting device is arranged between the laser generator and the atomic gas chamber, which can split the laser emitted by the laser generator into a first part of laser and a second part of laser, and make the first part of laser enter the atomic gas chamber and make the second part of laser enter a second light detector.Once the frequency of the laser generated by the laser generator changes, the proportion of the first part of laser and the second part of laser will change, and a feedback adjustment module feeds back and adjusts the laser generator according to the detection result of the second light detector, so that the laser emitted by the laser generator is the laser with a preset frequency, thereby realizing rapid and high-precision adjustment of the laser emitted by the laser generator, and further improving the detection precision of the whole magnetic force sensor system.

The application discloses a chain-like core-shell structure crystal and a preparation method and application thereof, the crystal is chloroethyl HDABCO-sodium bromofluoroborate, a structural formula of the crystal is [CH2ClCH2N(CH2CH2)3NH]4·[(Na6Br)(BF4) 13 ], a molecular structure presents a one-dimensional chain framework with infinite extension, adjacent chains are connected through N-H...F linear hydrogen bonds and chloroethyl-HDABCO, so that the compound has polarity and has a mid-infrared second-order nonlinear effect. In addition, the ultraviolet band edge absorption of the material is close to the near ultraviolet region, so that the material is expected to be close to inorganic ultraviolet nonlinear optical materials. The crystal is obtained through room temperature volatilization crystallization, has good thermal stability, and has potential application values in the fields of laser frequency doubling conversion, electro-optic modulators, deep ultraviolet nonlinear optics and shutter used for high-speed photography.

A self-calibration atomic wavemeter, including a saturated absorption spectrum optical path based on saturated absorption spectrum to lock the probe laser frequency on cesium atomic energy level transition line; a double-peak spectrum optical path scans the coupling laser frequency after the probe laser frequency is locked by the saturated absorption spectrum, when the probe laser and the coupling laser jointly act on the alkali metal atom and resonantly excite, the electromagnetic induced transparency effect is generated; and when the probe laser is detuned, the probe laser and the coupling laser jointly act on the alkali metal atom to produce non-resonant excitation, and the double-peak EIT spectrum with Doppler frequency shift is generated, based on the linear relationship between the double-peak spectrum interval and the probe laser detuning amount, the wavelength measurement of the current probe laser can be completed, in addition, the double-peak spectrum interval and the atomic energy level transition frequency are compared, and the difference between the two is taken as an error signal feedback to the control end of the probe laser, and the frequency of the probe laser is tuned to the reference frequency benchmark, so that the calibration of the wavemeter can be realized.

The present application relates to laser frequency stabilization technology, in order to solve the contradiction between chip and long-term frequency stability of on-chip frequency stabilization technology, provide a kind of long time laser frequency stabilization system based on on-chip optical reference microcavity, including: two lasers, on-chip optical reference microcavity;Two frequency locking modules are used for locking two lasers to two different modes of on-chip optical reference microcavity respectively;Dual-mode beat frequency measurement and control module is used for real-time measurement of the dual-mode frequency difference between the two different modes locked to on-chip optical reference microcavity;In-cavity temperature slow feedback control loop is used for generating temperature fine control feedback signal based on dual-mode frequency difference, and the fine temperature of on-chip optical reference microcavity is adjusted according to temperature fine control feedback signal, to compensate the optical cavity length change caused by thermo-optic effect and thermal expansion effect, so as to stabilize the resonant frequency of on-chip optical reference microcavity, reduce the long-term drift of on-chip laser light frequency, improve the long time frequency stability of laser single frequency output.

The invention discloses a broadband FP (Fabry-Perot) cavity transmission spectral line calibration method and a calibration spectral line generation device, and belongs to the field of astronomical spectrum calibration. According to the invention, the laser frequency comb is utilized to carry out precise calibration on the FP cavity, the precision is an Hz magnitude, and the calibration precision of the radial velocity of the FP cavity can reach m / s; by tuning laser frequency comb parameters, all transmission peaks are supplemented, and broadband coverage is achieved; the high precision requirement for FP cavity coating is avoided, the accuracy of transmission spectral lines is ensured, frequent calibration is performed on the FP cavity, and the problem that the FP cavity cannot provide long-term stability of frequency is solved; a low-repetition-frequency picosecond white light source is used, the spectrum is wide and flat, the spectrum is not sensitive to the position of a transmission peak of an FP cavity, and the light enters a calibrated FP cavity array to generate a calibration spectral line with a high signal-to-noise ratio and multiple frequency intervals, so that the calibration precision of the astronomical spectrometer reaches the cm / s-level radial velocity calibration precision. The method is applied to the calibration of the astronomical spectrometer for extrasolar planet search.