1003 results about "Optical cavity" patented technology

An example apparatus, method, and system for determining a characteristic of a target gas in a fluid sample is provided. In some embodiments, the example apparatus includes a frequency comb illumination source configured to emit pulsed light having a plurality of frequency comb wavelengths. The apparatus also includes an optical cavity containing a fluid sample and exhibiting a plurality of cavity resonance modes. A frequency comb wavelength of the plurality of frequency comb wavelengths associated with the frequency comb illumination source is configured to align with a cavity resonance mode of the plurality of cavity resonance modes. A characteristic of the fluid sample is determined based on one or more optical characteristics of a transmitted light passing through the fluid sample within the optical cavity.

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).

An optical cavity includes a cell having at least one structure with a first end and a second end, a first end-cap configured to removably receive a first mirror, and a second end-cap configured to removably receive a second mirror. The first end-cap is attached to the structure at the first end and has an opening with a center axis. The second end-cap is attached to the structure at the second end and has an opening with a center axis that is axially aligned with the center axis of the first end-cap. The cell can be a closed cell, wherein the structure is a tube axially aligned with the center axis. The cell can be an open cell, wherein the structure is a tube that includes one or more openings through its wall. The cell can be an open cell, wherein the structure includes one or more rods, each off axis from the center axis.

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.

The utility model discloses a laser cleaning head and a laser composite cleaning device. The laser cleaning head comprises a mounting base, a laser beam combining assembly and a galvanometer assembly, and the mounting base comprises an optical cavity; the laser beam combining assembly is arranged in the optical cavity, and the laser beam combining assembly is used for receiving the continuous laser and the pulse laser and combining the continuous laser and the pulse laser to form combined laser; the galvanometer assembly comprises a driving part and a galvanometer, the driving part is arranged on the mounting base, the driving part is connected with the galvanometer to drive the galvanometer to swing, and the galvanometer is located in the optical cavity and used for receiving the combined laser and converting the combined laser into scanning laser. According to the laser cleaning head provided by the embodiment of the invention, the continuous laser and the pulse laser are combined to form the combined laser, and the combined laser is transmitted to the galvanometer of the galvanometer assembly, so that the galvanometer is driven by the driving component to swing, the combined laser is converted into the scanning laser, the weight of the laser cleaning head can be reduced, and the laser cleaning efficiency is improved. And the requirement of a handheld scene of the laser cleaning head is met.

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 a calibration-free measurement device and method based on wavelength locked cavity ring-down spectroscopy, and the method comprises the steps: S1, carrying out the frequency modulation of laser wavelengths through an electro-optical modulator driven by a radio frequency signal, and obtaining laser of three wavelengths; s2, when the lasers with the three wavelengths enter the optical resonant cavity, turn-off control is carried out on the lasers with the three wavelengths, and a ring-down curve of e index attenuation is obtained; s3, carrying out ring-down signal fitting processing on the ring-down curves of the three wavelengths to obtain ring-down time data at the three wavelengths; and S4, converting the ring-down time data at the three wavelengths into absorption coefficient data at the three wavelengths, and comparing the absorption coefficient data with spectral parameters of absorption lines in a database to obtain the concentration of the gas to be measured so as to realize calibration-free gas measurement. According to the invention, the gas measurement rate is greatly improved, and the complexity and measurement cost of the system are reduced.

Photonic particles and methods of using particles in biological samples are disclosed. The particles are configured to emit laser light when stimulated by, for example, pump source energy. The particles may include: a gain medium having an inorganic material, an optical cavity having a high refractive index, and a coating having an organic material. The particles may be less than 3 microns along their longest axis. The particles may be attached to each other to form, for example, doublets and triplets. The particles may be injection locked by coupling an injection beam into the particles during pumping, so that the injection seeds are amplified to develop into laser oscillations. The microscope system may include a pump source, a beam scanner, a spectrometer having a resolution of less than 1 nanometer and an acquisition rate of greater than 1 kilohertz, and a spectrum analyzer configured to distinguish the spectral peaks output by the laser from a broadband background.

An optical metrology device characterizes a test object using a phase shift interferometer with synchronous time varying optical frequency shifts. A light source generates a beam having a time varying frequency, which is divided into two collinear, orthogonally polarized beams that differ by a first frequency shift. One or more optical cavities receive the beams and produce a pair of reference beams that differ from each other in frequency by the first frequency shift and a pair of test beams with a second frequency shift induced by the one or more optical cavities. The test beams differ from each other by the first frequency shift and differ from the reference beams by the second frequency shift. The first frequency shift has a pre-defined relationship with respect to the second frequency shift to generate interference between a reference beam and test beam that have frequency shift magnitudes with the pre-defined relationship.

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.

Provided are optical transformer devices having a high power efficiency. The device architecture provides uniform current spreading to minimize efficiency droop. The quantum well designs are optimized for both light-emitting diode (LED) and photo diode (PD) operation. A low-loss optical cavity allows efficient transfer of light from the LED junction to the PD junction. The architecture provides a low-loss voltage up- and down-conversion and provides compatibility with production-grade epitaxial growth and wafer fabrication processes.

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.

The invention belongs to the technical field of laser spectrum, and particularly relates to a 13CH4 isotope detection device and method based on optical feedback cavity enhancement. In order to improve the concentration precision of C13 and C12 in methane gas and the measurement precision of carbon isotopes, a laser controller controls a laser device to emit light beams to pass through a polaroid, a first lens, a quarter-wave plate, a second lens and a reflector to enter an optical cavity, laser is reflected back and forth in the optical cavity, laser in four directions can be emitted, and the concentration precision of C13 and C12 in the methane gas is improved. Wherein one beam returns to the DFB laser in the same path, a signal emitted from the right end of the optical cavity is received by the photoelectric detector, and a cavity mode signal with optical feedback is seen on the oscilloscope. After an acquisition program is started, the high-voltage amplifier is controlled to adjust the PZT, the feedback phase is controlled, and the frequency of the laser is locked to the optical cavity. When the whole device operates normally, only methane gas with different concentrations needs to be replaced, and the corresponding C13 and C12 measurement precision can be obtained.