709 results about "Optical cavity" patented technology

A multipass cell (300) comprising: a first reflector arrangement (305A, 305B); and a second reflector arrangement (307), the first (305A, 305B) and second (307) reflector arrangements defining an optical cavity (315) therebetween and the cell; wherein the first reflector arrangement (305A, 305B) is configured such that light incident on the first reflector arrangement (305A, 305B) is at least partially retroreflected towards the second reflector arrangement (307), wherein the second reflector (307) arrangement comprises a concave surface that is reflective, wherein at least one of the first (305A, 305B) and second (307) reflector arrangements comprises an aperture (306) for allowing light to enter and / or exit the optical cavity (315).

The invention provides a cavity adjusting method and device for a laser gyroscope resonant cavity, and the method comprises the following steps: building a light beam loop: horizontally placing a resonant cavity substrate on a supporting seat, and forming the light beam loop with two plane reflectors and two spherical reflectors; light beam introduction: starting a sweep frequency laser assembly, and enabling the reference light beam to enter a resonant cavity light path after passing through a light beam collimation system; light spot form monitoring and coarse adjustment: after a light beam emitted by the resonant cavity is collected by an image collector, the main control computer analyzes the light spot form and judges the imbalance state, evaluation information is fed back to the control system, the control system adjusts the inclination amount of the horizontal dimension and the pitching dimension of the light beam in the light beam collimation system according to the feedback information, and the light spot form is obtained. And the light spot is located at the center of the cavity mirror to finish coarse adjustment of the cavity. According to the method, coarse cavity adjustment can be completed without depending on a complex optical cavity technology, the cavity adjustment time is greatly shortened, the overall operation is simple, and the cavity adjustment efficiency is improved.

The invention discloses a hybrid integrated optical fiber coupling superconducting nanowire single-photon detector and an implementation method. The detector is directly integrated on the end face of an optical fiber, each layer of superconducting nanowire single-photon detector comprises a superconducting nanowire, electrodes at the two ends and a lower-layer optical cavity, the center of the nanowire is aligned with a fiber core of the optical fiber, and the uppermost layer is integrated with the optical cavity and a reflector; wherein the projections of the nanowires of the same detector are parallel to each other, the nanowires of different detectors are mutually orthogonal in pairs, and the polarization-insensitive superconducting nanowire single-photon detector is obtained after packaging. Or the nanowire projections of each layer of detector are parallel to each other, and the superconductive nanowire single-photon detector with high absorptivity is obtained after packaging. Or all layers of detectors and reflectors are integrated into optical cavities with different thicknesses, and the wide-spectrum superconducting nanowire single-photon detector with multiple central wavelengths is obtained after packaging. According to the invention, a high-performance and multifunctional superconducting nanowire single-photon detector is realized through a hybrid integration process.

The invention discloses a mixed gas absorption spectrum analysis method and system based on variational mode decomposition, specific laser is injected into an optical resonant cavity unit, and a detector unit continuously monitors the light intensity change and records a light intensity attenuation signal; pre-processing the recorded light intensity attenuation signal; carrying out VMD decomposition on the preprocessed ring-down signal to obtain a plurality of IMF components, respectively introducing CO2 and CO gases with known concentrations into the optical resonance unit, and recording spectral data of each single gas component; calculating the similarity and contribution degree of each IMF component, and setting a weight combination to form a joint score; the gas with the highest joint score is selected, the score is compared with an adaptive threshold value, and when the score is higher than the adaptive threshold value, the IMF component is marked as the characteristic component of the corresponding gas; and finally, gathering and outputting the marked IMF components according to gas types to obtain characteristic signals of the gases, thereby realizing multi-component gas separation in the mixed gas absorption spectrum.

An optical parametric oscillator and method for generating coherent signal light involve a resonant optical cavity for coherent signal light, and in the cavity a non-parametric gain element for amplifying the coherent signal light to only partially compensate for passive optical roundtrip losses, thereby obtaining lower effective roundtrip losses. A parametric gain element is arranged in the cavity, for converting coherent pump light into coherent signal light through an instantaneous nonlinear optical interaction. The parametric oscillator has means for adjusting an intracavity optical power of the coherent pump light above a threshold value, where the parametric gain is balancing the effective roundtrip losses, thus inducing sustained oscillations of the signal light in the optical cavity. The non-parametric gain element is configured to have a limited non-parametric gain over a gain bandwidth of the parametric gain element, which is less than the passive optical roundtrip losses in the gain bandwidth.

The invention provides a transcendental extreme ultraviolet light source device which comprises a free electron laser main body which comprises an undulator system and an optical resonant cavity. The undulator system comprises a modulation section undulator and a radiation section undulator; the optical resonant cavity comprises resonant cavity reflectors and a dispersion section, and the modulation section undulator, the dispersion section undulator and the radiation section undulator are sequentially arranged in the direction of an electron beam and are all located between the resonant cavity reflectors; the resonant wavelength output by the radiation section undulator is 1 / h of the resonant wavelength of the modulation section undulator, h is the harmonic number, and when the resonant wavelength output by the radiation section undulator is 6-7nm, the radiation wavelength reflected by the resonant cavity is h times of the resonant wavelength output by the radiation section undulator, so that the resonant cavity is prevented from adopting a reflector with the reflection wavelength of 6-7nm. According to the device, the radiation of the target wavelength is output by using harmonic waves, and a reflector with relatively long wavelength and mature technology can be directly used; various accelerators are compatible, the energy efficiency of the accelerators is greatly improved, and power consumption is reduced.

The invention discloses an air-cooled optical fiber laser based on a modular heat dissipation mode, which comprises a heat dissipation main body base and a laser pumping module, the heat dissipation main body base is of a hollow structure, the front end and the rear end of the heat dissipation main body base are both provided with a plurality of heat dissipation fins which are arranged at intervals, the rear end of the heat dissipation main body base is provided with a heat dissipation fan, and the heat dissipation fan is connected with the laser pumping module. One side face of the heat dissipation main body base is a high heat load face, the other side face of the heat dissipation main body base is a low heat load face, the high heat load face is used for installing a laser pumping module, the low heat load face is used for installing a laser optical cavity panel, and side sealing plates are installed on the top face and the bottom face of the heat dissipation main body base respectively. According to the invention, the modular arrangement is adopted, so that a plurality of modules can be assembled conveniently, flexible combination from low power to high power is realized, and the heat dissipation performance is improved.

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 provides a quantum storage device and a quantum storage method based on an optical resonant cavity. The quantum storage device comprises a light generation module which emits pump light and a light signal; the electric pulse generation module generates an electric pulse signal corresponding to the optical signal according to a preset storage mode; the storage module comprises a rare earth doped crystal, a first reflecting film on a first surface of the storage module and a second reflecting film on a second surface of the rare earth doped crystal form an optical resonant cavity, and a preset included angle is formed between the first surface and the second surface so as to change the resonant frequency of the optical resonant cavity; the optical waveguide array is arranged in the third surface of the rare earth doped crystal; the electrical waveguide array is arranged on the third surface and is electrically connected with the electrical pulse generation module, and the absorption band structure of the rare earth ions is changed through electrical pulse signals; an optical signal is coupled into the optical resonant cavity through the optical waveguide array and interacts with the rare earth ions in the optical resonant cavity, so that the population of the rare earth ions is excited to an optical upper energy level, and the optical signal is stored.

A continuous-wave perovskite polariton laser device, including an optical microcavity, a spacer layer, and a gain medium. The gain medium is a perovskite material or a composite material containing perovskite, in a form of thin film, microcrystal, phosphor, nanocrystal, quantum dot, or single crystal. The perovskite gain medium is prepared by solution process or vacuum deposition technique, and is combined with an optical resonator. By exploiting the strong interaction between excitons and photons, a steady-state exciton-polariton condensation is formed, enabling the generation of continuous-wave polariton laser emission with a low threshold. The laser device can achieve low-threshold continuous-wave or pulsed lasing emission at room temperature under various light sources pumping or electrical excitation. Its threshold is 1 to 3 orders of magnitude lower than that of conventional semiconductor lasers, with an optimized threshold as low as 0.1 to 1 W / cm2, representing a novel ultralow-power coherent light source technology.

An optoelectronic device that includes a substrate and a stack of organic layers that has at least one active layer arranged between a reflective surface and a semi-reflective surface arranged facing one another at a given distance and forming an optical cavity. The device includes at least three groups of pixels, each group of which is characterized by a cavity of a different optical length, the cavity having a number of bilayers arranged between the substrate and said stack of organic layers, each bilayer being formed of a first transparent and conductive layer of a first transparent and conductive material, and of a second transparent and conductive layer of a second transparent and conductive material, in direct contact with the first transparent and conductive layer.

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.

The invention provides a method and a system for realizing a weak measurement enhanced chip-level microcavity gyroscope. The method comprises the following steps of: 1, providing a coherent state input by a system by using a single-frequency laser; 2, the output of the single-frequency laser is switched between a first path and a second path through an optical switch, the laser beam is transmitted to the first path in the first half part of the period, and the laser beam is transmitted to the second path in the second half part of the period; 3, the light transmitted along the first path and the second path respectively passes through an optical resonant cavity to sense the rotation angular speed, and a weak value amplification effect is achieved by setting front and back selection states; and step 4, weak measurement enhanced output results transmitted along the first path and the second path are respectively received by a photoelectric detector, and the value of the rotation angular velocity is demodulated according to the obtained output results. According to the invention, the optical microcavity is used as a sensing unit of the gyroscope, the sensing performance of the integrated optical gyroscope is greatly enhanced through a weak measurement technology, and the whole set of system can realize chip-level integration.

A quantum memory device 100 for storing a signal field 170 comprises an optical cavity comprising a first and second reflective surface 110, 120, a first and a second optical element 130,140 within th

An optical source is described. This optical source may include a semiconductor laser chip and a silicon-photonics chip that provide an optical cavity. The semiconductor laser chip may provide gain at multiple lasing wavelengths in a band of wavelengths. Moreover, the silicon-photonics chip may adjust a size of an optical signal proximate to an interface between the semiconductor laser chip and the silicon-photonics chip. Furthermore, by adjusting a phase of a phase shifter and resonance frequencies of a micro-ring resonator in the silicon-photonics chip, a center frequency of a passband of the micro-ring resonator may be matched to a non-zero integer multiple of a cavity-mode spacing. This may allow the optical source to mode-lock the lasing wavelengths of the optical source by suppressing unwanted lasing wavelengths and re-enforcing the lasing wavelengths. In some embodiments, a free-spectral range of the optical source may be between 100 GHz and 800 GHz.

The present application relates to an external cavity narrow linewidth laser assembly, comprising: a substrate, to which a gain chip for emitting laser light is fixedly connected; a first light-transmitting reflector and a second light-transmitting reflector, spaced in sequence and located in the direction of the laser emitting end of the gain chip, are also connected to the substrate; the first light-transmitting reflector is spaced apart from the gain chip and together form a first external optical resonant cavity; the second light-transmitting reflector is spaced apart from the first light-transmitting reflector and together with the gain chip form a second external optical resonant cavity. The first and second external optical resonant cavities of the external cavity narrow linewidth laser assembly of the present application significantly increase the resonant cavity length within the limited tube shell space. The longer the resonant cavity length, the longer the coherent light length, and thus the narrower the linewidth, achieving higher performance while maintaining a low cost.

The invention discloses a narrow linewidth laser frequency control device and method based on optical feedback discretization, and belongs to the technical field of laser control. In order to solve the problems of poor frequency stability and tuning range of an existing laser, a laser beam emitted by the laser is incident to an optical feedback assembly to generate front-cavity mirror transmission light; the optical heterodyne feedback adjusting assembly demodulates an electric signal corresponding to the transmission light of the cavity front mirror to obtain an error signal, and transmits the error signal to the high-voltage amplification control module end to control the PZT, so that the high-voltage amplification control module end controls the PZT according to the error signal to lock the laser frequency on the cavity mode frequency; and meanwhile, the laser controller changes the working current of the laser, so that the laser frequency is locked on each intrinsic cavity mode frequency of the optical resonant cavity, and a series of discrete wide-range stable locking frequencies are obtained under the control of the temperature control module.

The invention provides an atypical MOPA fiber laser device integration device, system and method. The device comprises an optical resonant cavity, a first device group and a second device group, wherein the first device group comprises a first amplification stage gain optical fiber, a first reverse pumping beam combiner, a first pumping source and a first cladding light stripper, and the second device group comprises a second amplification stage gain optical fiber, a second reverse pumping beam combiner, a second pumping source and a second cladding light stripper; the optical resonant cavity is used for receiving the pump light transmitted by the first amplification stage gain optical fiber and the second amplification stage gain optical fiber, transmitting the pump light which is not absorbed to the second amplification stage gain optical fiber and the first amplification stage gain optical fiber, and generating signal light under the action of the absorbed pump light; and the signal light is transmitted to the first amplification stage gain fiber and the second amplification stage gain fiber in positive and negative directions. The device number and the manufacturing cost are remarkably reduced, the light-to-light conversion efficiency and the system reliability are improved, and meanwhile high-power beam combination and miniaturization integration are facilitated.

An FM LIDAR system is described that includes a frequency modulated LIDAR system that incorporates a laser source that is optically coupled to a whispering gallery mode optical resonator. Light from the laser that is coupled into the whispering gallery mode optical resonator is coupled back out as a returning counterpropagating wave having a frequency characteristic of a whispering gallery mode of the optical resonator. This returning wave is used to reduce the linewidth of the source laser by optical injection. Modulation of the optical properties of the whispering gallery mode optical resonator results in modulation of the frequency of the frequencies supported by whispering gallery modes of the resonator, and provides a method for producing highly linear and reproducible optical chirps that are highly suited for use in a LIDAR system. Methods of using such an FM LIDAR system and vehicle assisting systems that incorporate such FM LIDAR systems are also described.

The invention is applicable to the technical field of marine oil and gas resource exploration, and provides an intelligent monitoring system and method for carbon isotopes of wellbore gas, the system comprises an explosion-proof shell, and further comprises a gas pretreatment module for removing impurities affecting CH4 and C2H6 gas spectral lines and adjusting temperature and pressure of measured gas; the optical cavity detection module comprises a laser, a collimator, a detector and an MPC, and is used for completing the energy level excitation of the infrared light to the gas to be detected, the injection of a detection light source into the MPC from the laser, the multiple reflection of the detection light in the MPC, the built-in multi-beam laser light source, and the absorption detection of the multi-component gas through a single optical cavity; and the data processing module is used for collecting, processing, displaying and outputting the measured data in real time. The system is high in detection precision, high in environmental adaptability, high in response speed and miniaturized in equipment, and has a wide market prospect.

The invention relates to the technical field of spacecraft structure micro stress detection, in particular to a spacecraft structure micro stress detection device and a use method thereof, and the spacecraft structure micro stress detection device comprises a displacement amplification structure, a single mode fiber, a reflector, a broadband light source and a spectrum analyzer. An optical resonant cavity formed by an optical fiber end face and a lens is combined with a displacement amplification structure, when stress acts on a spacecraft structure, the cavity length of the Fabry-Perot resonant cavity changes, so that phase movement of light is caused, and accurate measurement of the stress can be achieved by detecting the phase movement. The antenna has extremely high anti-electromagnetic interference capability, and can work stably in a complex space environment. Even under the condition of violent temperature change, high measurement accuracy can be kept, and detection of tiny stress can be achieved through the amplification effect of the displacement amplification structure. And the stress characteristic signal and the background noise can be effectively separated, so that the detection reliability is remarkably improved.

A light control film includes a plurality of substantially parallel optical cavities. Each of the optical cavities has a height H along a thickness direction of the light control film and a minimum lateral dimension W along an in-plane width direction orthogonal to the thickness direction, where H≥W. The optical cavities are substantially filled with a liquid including a plurality of light absorbing particles configured to move along the thickness direction in response to one or more applied signals or fields such that the movement along the thickness direction causes each of the optical cavities to transition between a substantially opaque state and a substantially transparent state. A full viewing angle of the light control film increases when the optical cavities transition from the substantially opaque state to the substantially transparent state.

A light emitting device is provided including a wavelength conversion structure configured to convert electromagnetic radiation of a first wavelength in to an electromagnetic radiation of a second wavelength; a plurality of light sources, wherein at least one light source is configured to emit an electromagnetic radiation of the first wavelength, wherein the plurality of light sources are arranged on or above the wavelength conversion structure; and an optical metastructure configured as optical cavity comprising a resonance frequency at about the second wavelength.

The utility model provides a gas detection device based on NDIR, which comprises a PCB (printed circuit board), a bottom plate and an upper cover, the upper cover is provided with an optical cavity, the periphery of the bottom plate is embedded with the inner wall of a coaming to seal the optical cavity, the bottom plate is provided with a first through hole and a second through hole, an infrared light source on the PCB penetrates through the first through hole to extend into the optical cavity, and the infrared light source on the PCB penetrates through the second through hole to extend into the optical cavity. The dual-channel infrared sensor penetrates through the second through hole and extends into the light cavity; the dual-channel infrared sensor is provided with a first channel and a second channel, the cover plate is provided with a V-shaped reflecting plate and a light gathering plate, the light gathering plate is provided with a first reflecting surface corresponding to the first channel and a second reflecting surface corresponding to the second channel, the two sides of the light gathering plate are respectively provided with a main detection air hole, and the cover plate is provided with a plurality of auxiliary detection air holes. On the basis of an original main detection gas hole, a plurality of auxiliary detection gas holes are additionally formed in the cover plate, the gas exchange rate is increased, meanwhile, the light gathering plate is designed to be provided with double reflecting surfaces, and the increase of infrared light loss caused by the auxiliary detection gas holes is made up.

The invention discloses a ring-down light cavity precision pressure control method and device based on enhanced data-driven PID, and the method comprises the steps: 1) building a ring-down light cavity pressure control device, and integrating a pressure sensor, a proportional valve, a digital multimeter, a DC power supply, a vacuum pump and other key parts; 2) acquiring a proportional valve driving voltage and a pressure feedback signal based on LabVIEW, and constructing a discrete time ARX model of the system; (3) on the basis of the model residual error and the real-time error, an enhanced data driving algorithm is adopted to carry out online self-adaptive updating on PID parameters; 4) filtering high-frequency noise by using a second-order Bessel low-pass filter to improve the signal stability; and 5) realizing closed-loop control under the LabVIEW platform, and monitoring and maintaining the operation performance of the system in real time. The method has the advantages of model self-learning, parameter self-tuning, high robustness, high control precision and the like, is particularly suitable for scenes such as high-precision spectral measurement with extremely high requirements on pressure stability, and has remarkable engineering practical value and popularization and application prospects.

A horizontal double-ball quasi-optical cavity testing device for measuring the electromagnetic performance of a thin film material relates to the field of electromagnetic characteristic parameter testing, in particular to a quasi-optical cavity method testing system, and comprises a vector network analyzer (1), a frequency doubling module (2), a waveguide (3), a quasi-optical cavity (4), a sample clamp (5), a bidirectional transmission screw rod (6), a shielding frame (7), a displacement platform (8), a base (9) and a supporting block (10). The quasi-optical cavity (4) is of a double-spherical-cavity structure, is connected with the vector network analyzer (1) in a horizontal manner, and tests a sample by utilizing a resonance method; the sample clamp (5) adjusts the position of the sample by using a displacement platform (8); the shielding frame (7) can restrain miscellaneous molds, and the restraining effect is adjusted through the two-way transmission lead screw (6). The device has the advantages that the double-ball-cavity sensitivity is high, and the device is suitable for thin-film material testing; the horizontal structure is beneficial to connection of the vector network analyzer and the quasi-optical cavity; the double-ball cavity can measure the electromagnetic performance of the thin film material according to different odd and even modes.

The invention relates to a method for rapidly turning off a pulsed light cavity ring-down system light source based on frequency shift keying, belongs to the technical field of cavity ring-down spectroscopy, and aims to couple laser generated by a laser light source into a ring-down cavity and realize the function of rapidly and conveniently turning off an optical signal coupled into the ring-down cavity by utilizing the frequency selectivity of the ring-down cavity and combining the frequency shift keying technology. An oscilloscope is used for observing and recording a ring-down signal, when a detection signal reaches a set trigger threshold value, a positive pulse trigger signal is output to a signal generator to start frequency shift keying, and the frequency of incident light is modulated, so that a light source coupled into a ring-down cavity is cut off. According to the invention, an extra circuit control plate is not needed to turn off the current of the laser driver, and a solution is provided for rapidly turning off the laser source in the pulsed cavity ring-down technology.

The invention discloses a double-chamber MEMS (Micro Electro Mechanical System) atomic gas chamber integrating heating and temperature measuring functions and a manufacturing method. The double-chamber MEMS atomic gas chamber adopts a glass-silicon-glass bonding three-layer structure, a heating coil and a temperature measuring coil are prepared on the back surface of a top glass cover plate, and a coil electrode is led out from the front surface of the top glass cover plate through a glass through hole technology; an optical cavity and a reaction cavity are arranged on the middle silicon wafer in parallel and are communicated through a micro-channel; the heating coil is made of a transparent conductive material, is located over the optical cavity and can directly heat alkali metal atoms in the cavity, the temperature measuring coil is arranged around the heating coil, and real-time closed-loop control over the temperature of the air chamber can be achieved through a circuit. Compared with an existing integration mode, heat dissipation is reduced, the heating efficiency of the air chamber is improved, and then the sensitivity and stability of quantum precision measurement instruments such as an atomic magnetometer and an atomic clock are improved.

The invention provides an optical cavity locking system and method. The system comprises a laser assembly, a mode regulation and control assembly, an optical resonant cavity assembly, a detection assembly and a servo controller. The laser assembly is used for generating incident laser and adjusting parameters of the incident laser; the mode regulation and control assembly is used for splitting incident laser into first laser and second laser; the optical resonant cavity assembly is used for generating a transmission peak signal through the first laser and generating a nonlinear process through the second laser to obtain a first optical signal and a second optical signal; the detection assembly is used for converting the first optical signal into an intensity signal, performing difference frequency operation on the intensity signal and the microwave signal to generate a difference frequency signal and amplifying the difference frequency signal to obtain an error signal; the servo controller is used for receiving an error signal generated by the detection assembly; and generating a feedback signal based on the error signal and transmitting the feedback signal to a feedback actuator of the laser assembly, so as to solve the problem that the locking between the high-power laser and the high-quality factor optical resonant cavity is difficult at present.

The invention is suitable for the technical field of optical design parameter optimization, and provides a design parameter optimization method and system for a long-optical-path gas absorption cell, and the method comprises the following steps: carrying out the theoretical verification of the feasibility of the lens parameters of a spherical reflector based on a theoretical model of a light propagation matrix, and obtaining the design parameters of the spherical reflector; determining an initial lens parameter and a key design parameter range; an optical cavity model composed of two spherical reflectors is established, and automatic ray tracing simulation is carried out according to the initial lens parameters, the key design parameter range and a preset stepping value; the simulation data are verified, the number of light spots is determined, and the optimal key design parameter combination enabling the optical path to be maximized is screened out according to the number of the light spots. The method is mainly used for designing a long-optical-path gas absorption cell in infrared absorption spectrum trace gas sensor detection, has practical significance, realizes verification of optimal design parameters, reduces development difficulty and improves development efficiency.