89 results about "Spontaneous emission" patented technology

The invention belongs to the technical field of spectral measurement, and particularly discloses a non-contact high-temperature detector based on a visible light spectrometer and a full-spectrum method, which comprises a full-spectrum collection system and a spectral analysis system. The output end of the full-spectrum collection system is connected with the input end of the spectral analysis system; the light splitting module is used for acquiring spontaneous radiation light of a to-be-detected target and carrying out dispersion light splitting on the radiation light to obtain visible light full-band spectral data; and the spectral analysis system is used for analyzing and processing the visible light full-band spectral data to obtain the spectrum of the to-be-detected target, and obtaining the temperature based on the spectrum of the to-be-detected target, so that the precision of temperature detection can be remarkably enhanced.

Performance evaluation and structural optimization methods for a high-power semiconductor laser chip, and a performance evaluation system for a high-power semiconductor laser chip. The performance evaluation method for a high-power semiconductor laser chip comprises: providing a window on an N-side electrode of a chip to be tested (step 1); keeping the chip in an operating state (step 2); allowing a quantum well active region of the chip to generate spontaneous emission, so that the spontaneous emission is imaged outside the chip (step 3); acquiring, by means of a spectrograph, a spectrum of the spontaneous emission outside the chip and obtaining a two-dimensional distribution of a quantum well temperature of the chip in the operating state; and acquiring, by means of a CCD camera, an image of the spontaneous emission imaging outside the chip and obtaining a two-dimensional distribution of charge carriers in the quantum well of the chip in the operating state (step 4). According to the performance evaluation and structural optimization methods for a high-power semiconductor laser chip, the distributions of the temperature and the charge carrier concentration in the quantum well of the chip to be tested in the operating state in which the resolution is freely adjusted can be obtained. Operations of the methods are convenient, and implementation is simple and easy, thereby efficiently improving the accuracy of an evaluation result.

The invention relates to a wind measurement laser radar system, which comprises a first light source assembly for emitting first signal light and a second light source for emitting multimode pump laser, the acousto-optic device is used for performing pulse and frequency shift modulation on the first signal light to obtain second signal light; the first optical fiber is a double-cladding erbium-ytterbium co-doped optical fiber and is used for amplifying the second signal light to obtain third signal light; the polarization reflection device filters amplified spontaneous emission light in the third signal light to obtain fourth signal light; the first optical fiber further amplifies the fourth signal light again to obtain fifth signal light; the acousto-optic device performs pulse and frequency shift modulation on the fifth signal light again to obtain sixth signal light; the time division switching device controls the deflection module to deflect the sixth signal light, so that the sixth signal light is split by the beam splitting module at different time to obtain seventh signal light, the seventh signal light is emitted through different ports, the power of the two-way amplifier can be further improved, and the detection distance of the wind measurement radar is increased.

The invention relates to a high-power light source in the technical field of laser, in particular to a high-power light source for assisting an EYDFA to output a 1.5-micron wave band based on 1-micron wave band signal light, which absorbs untransferred pump light by introducing the signal light in the 1-micron wave band, further inhibits spontaneous radiation amplification of 1-micron wave band ytterbium ions, and improves the output efficiency of the 1-micron wave band ytterbium ions. The wavelength of the selected 1-micron-band signal light is located at the reabsorption wavelength of the EYDFA at the same time, the 1-micron-band signal light absorbing redundant pump light is reabsorbed by the EYDFA, energy is further transferred to erbium ions, and the conversion efficiency and output power of 1.5-micron-band laser are improved.

According to the laser chip capable of inhibiting in-plane amplified spontaneous emission, the first inclined edge and the second inclined edge are designed, opposite edges parallel to the first cleavage edge and the second cleavage edge respectively are damaged, a first parasitic cavity and a second parasitic cavity existing in a natural cleavage laser chip are eliminated, and the laser chip can inhibit in-plane amplified spontaneous emission. Therefore, the formation of in-plane amplified spontaneous emission of the laser chip is remarkably inhibited, meaningless consumption of carriers in a laser emission layer in the laser chip is prevented, the luminous efficiency of the laser chip on laser wavelength can be improved, the light-light conversion efficiency of the laser from pump light to emission laser is improved, and the output power of the laser is finally improved. And secondly, due to the suppression of amplified spontaneous radiation in a laser chip plane and the improvement of the light-light conversion efficiency of the laser, the power consumption of the laser can be obviously reduced under the condition of certain output power, the operation cost of the laser is reduced to a certain extent, and the cost performance of the laser is improved.

The invention provides a semiconductor defect detection method and device based on short-medium wave infrared microscopic imaging, and the method comprises the steps: selecting a short-medium wave infrared band with the wavelength greater than or equal to 2.5 microns as a detection working band, and employing an infrared light source capable of covering the detection working band and a corresponding infrared area array detector; constructing an infrared microscopic imaging light path, and irradiating light emitted by an infrared light source to the surface of a sample through an infrared illumination light path after passing through a beam splitter and an infrared microscopic objective lens; sample reflected light is collected through an infrared microscope objective and is imaged on an infrared area array detector; two-dimensional view field scanning is performed on the sample, imaging is realized through a focusing mechanism, and surface and internal defects are detected; the infrared light source is modulated, so that signal light reflected by the sample is an alternating-current signal, the alternating-current signal is separated from direct-current noise spontaneously radiated by the background, and internal defects of the semiconductor sample are detected after the noise is filtered and the signal-to-noise ratio of an image is improved. The invention provides a high-sensitivity and high-resolution solution for semiconductor defect detection.

A reconfigurable optical add / drop multiplexer using a wavelength selective switch (WSS) component to multiplex wavelength channels into a wavelength division multiplexed (WDM) signal. When a given channel is dropped, an amplified spontaneous emission (ASE) injection signal is multiplexed as a ghost channel into the WDM signal. The ASE injection channel can mitigate polarization hole burning and can provide a fuller power spectrum density. However, the ASE injection channel also defines a monitoring window. As an optical channel monitor (OCM) monitors the WDM signal, the OCM can detect, within the monitoring window, any underlying characteristic of the given wavelength channel. In this instance in response to the detected characteristic, the WSS component switches from multiplexing the ghost channel into the WDM signal to multiplexing the given wavelength channel into the WDM signal.

The invention relates to the technical field of spontaneous emission light sources, in particular to an integrated amplified spontaneous emission light source based on an erbium-doped waveguide, which comprises a pump laser, a wavelength division multiplexer, the erbium-doped waveguide, a waveguide reflecting region, a waveguide optical isolator and a waveguide filter, and is characterized in that the wavelength division multiplexer is provided with an input end, a first output end and a second output end; the pump laser is connected with the input end of the wavelength division multiplexer, the second output end of the wavelength division multiplexer is connected with the waveguide reflection area, the first output end of the wavelength division multiplexer is connected to the input end of the erbium-doped waveguide, the output end of the erbium-doped waveguide is connected to the input end of the waveguide optical isolator, and the output end of the waveguide optical isolator is connected with the waveguide filter; the size of the light source is greatly reduced through the integrated waveguide design, and the performance of the light source is guaranteed under the condition that the size of the light source is greatly reduced.

The invention relates to the technical field of laser devices, in particular to a Brillouin semiconductor laser device which comprises a gain chip, a Brillouin semiconductor laser device and a Brillouin semiconductor laser device, a Bragg grating; a microring resonator; the beam splitter is located between the micro-ring resonator and the Bragg grating; wherein the gain chip is used for generating spontaneous radiation light, the Bragg grating and the high-reflection film form a resonant cavity, the spontaneous radiation light is processed by the resonant cavity to form pump light, the pump light is injected into the micro-ring resonator through a second end of the Bragg grating, the micro-ring resonator generates a stimulated Brillouin scattering effect to generate Stokes light, and the Stokes light is transmitted to the high-reflection film. The micro-ring resonator carries out mode selection amplification on the Stokes light, ultra-narrow linewidth Brillouin laser is output from the first end of the micro-ring resonator, and the beam splitter outputs the ultra-narrow linewidth Brillouin laser according to a preset proportion. According to the Brillouin semiconductor laser, the integration level and the compactness of the Brillouin semiconductor laser are improved while it is guaranteed that the Brillouin semiconductor laser has excellent performance.

The invention discloses a high-temperature high-density plasma generation and radiation opacity measurement method, which comprises the following steps: clamping a target material by using low-density low-Z-element foam to form a sandwich structure sample, and synchronously and directly driving the sandwich sample from two sides by using multiple beams of smooth nanosecond laser, the preparation temperature reaches 1,000,000 DEG C, and the electron density reaches 1 * 1023 pieces per cubic centimeter; then generating an X-ray source through the action of one or more nanosecond laser beams and the high-Z material, measuring the absorption spectrum of the X-ray source penetrating through the target plasma, the backlight spectrum of the X-ray source not penetrating through the target plasma and the self-emission spectrum of the target plasma through a spectrograph, and finally realizing the measurement of the radiation opacity of the high-temperature and high-density plasma. The high-temperature and high-density plasma radiation opaqueness measurement device has the beneficial effects that the high-temperature and high-density plasma radiation opaqueness measurement of which the temperature reaches 1,000,000 DEG C and the electron density reaches 1 * 1023 per cubic centimeter is realized on a million-joule nanosecond laser device.

This invention provides a highly efficient method for separating or concentrating lattice defect-containing nanoparticles (NDs). [Solution] A method for separating or concentrating lattice defect-containing ND particles, comprising irradiating a dispersion containing at least two types of ND particles selected from nanodiamond (ND) particles having at least one type of lattice defect and ND particles without the lattice defect with at least one type of excitation laser light having an energy greater than or equal to the resonance absorption energy of the lattice defect and at least one type of stimulated emission laser light, thereby selectively moving the ND particles having the lattice defect by the absorption optical pressure generated by the absorption of at least one type of excitation laser light and the stimulated recoil force generated by the action of at least one type of stimulated emission laser light, wherein the excitation laser light transitions electrons in the ground state of the ND particles to an excited state, and the stimulated emission laser light transitions electrons in the excited state to the ground state faster than spontaneous emission to generate stimulated recoil force.

This invention claims protection for a laser device and optical path debugging method for acquiring micro-sized beams, belonging to the field of solid-state laser technology. The device structure includes: an indicator light source, a high-gain module, a micro-sized pinhole aperture, a micro-sized output mirror, and a micro-sized reflector. The debugging method consists of the following steps: S1: Determine the pitch and yaw of the micro-sized reflector using the indicator light source and the micro-sized pinhole aperture; S2: Determine the spontaneous emission light path of the high-gain module based on the micro-sized reflector and the two micro-sized pinhole apertures; S3: Add the micro-sized output mirror to achieve laser resonator oscillation based on the micro-sized cavity mirror. Because the cavity mirror is small enough, this invention eliminates the need for external pinhole beam contraction, reducing diffraction effects. Furthermore, by using an internal pinhole aperture to determine the optical path, it solves the problem of the spontaneous emission amplification optical path of the module not coinciding with the resonator oscillation optical path, improving output power and meeting the requirements for outputting micro-sized beams based on a high-gain module.

A kind of water environment cadmium ion and temperature double parameter optical fiber chemical sensing system relates to water body environment detection field.In the above system, spontaneous emission light source is near infrared light source;The surface of optical fiber sensing unit is coated with magnetic MOF-cadmium ion imprinted polymer;The light signal generated by spontaneous emission light source enters optical fiber sensing unit, optical spectrometer collects the transmission spectrum signal of optical fiber sensing unit, and the collected spectrum data are output to photoelectric detection module;Photoelectric detection module converts light signal into electrical signal and transmits to demodulation module;Demodulation module gives the cadmium ion concentration and temperature according to input signal using machine learning algorithm.The present application has higher specific recognition ability to cadmium ion, and can effectively separate the coupling influence of cadmium ion concentration and temperature on sensing signal.

The present invention relates to an upconversion nanomaterial with red light emission and a preparation method thereof, belonging to the technical field of luminescent materials. The upconversion nanomaterial with red light emission provided by the present invention has LiErF4:0.5%Tm as a core layer, and is coated with a LiYF4:50%Yb,x%Er,y%Ce shell layer and a LiYF4 passivation layer in sequence; its chemical formula is LiErF4:0.5%Tm@LiYF4:50%Yb,x%Er,y%Ce@LiYF4; wherein x=0-15 and y=0-4. The present invention dopes Er in the first shell layer at an appropriate concentration. 3+ ,Ce 3+ and Yb 3+ , and Er 3+ As an energy harvester, Ce 3+ With Er 3+ The cross-relaxation effect increases Er 3+ Yb 3+ The collection efficiency of spontaneous emission energy is 3+ The energy is transferred back to the nuclear layer, resulting in a significant red light emission.

Since it is difficult to constantly monitor a large number of unused fiber optic transmission lines in an optical submarine cable system, a light source device according to the present invention includes: a light generation unit for generating amplified spontaneous emission light; a light control unit for controlling the band and power of the amplified spontaneous emission light and generating waveform shaping spontaneous emission light; and an optical branching unit for branching the waveform shaping spontaneous emission light into a plurality of branched light beams.

The invention discloses an ultra-wideband weak signal detection method and system based on all-optical oscillation and phase-amplitude conversion. The method comprises the steps that spontaneous radiation light generated by an erbium-doped optical fiber amplifier is used as an optical carrier; modulating a weak radio frequency signal to be measured received by an antenna to the optical carrier through an optical modulator to form a modulated optical signal; the modulated optical signal is injected into an all-optical oscillation circuit composed of double loops, the all-optical oscillation circuit generates multimode optical oscillation by adjusting an optical attenuator, and the all-optical oscillation circuit comprises a double-loop interference structure; performing phase-amplitude conversion by adjusting the delay difference of the two light paths in the double loops to form an equivalent microwave photon filter so as to select and amplify the modulated light signal corresponding to the radio frequency signal of the set frequency band; and converting the selected and amplified modulated optical signal into an electric signal, and performing spectral analysis to detect the weak radio frequency signal to be detected.

The invention provides a coaxiality correction optical system and a coaxiality correction method and device, and relates to the technical field of laser communication.The coaxiality correction optical system comprises a light emitting and processing module, a light transmission module, an emitting correction module, a receiving correction module and a detection module; the spontaneous radiation light generated by the light emitting and processing module for laser communication is used as the calibration light source, so that an independent calibration light source does not need to be additionally arranged, and the light path complexity of the laser communication terminal is effectively reduced; and the same detection module is used for imaging the spontaneous radiation light, the reflected light of the emitted first signal light and the reflected light of the received second signal light, so that the coaxiality of the emission optical axis, the receiving optical fiber optical axis, the tracking receiving optical axis and the calibration emission optical fiber optical axis of the laser communication terminal is monitored and corrected in real time at the same time. Accurate real-time monitoring and correction of the coaxiality of the transmitting and receiving optical axes of the laser communication terminal are realized.

The invention provides a spontaneous radiation active control system based on hyperbolic structure deflection regulation, which relates to the technical field of quantum photon regulation and comprises a hyperbolic dispersion structure layer, a quantum emitter, a nano waveguide and a substrate, the quantum emitter is used for emitting spontaneous radiation photons to be regulated and controlled; the hyperbolic dispersion structure layer is used for processing spontaneous radiation photons to be regulated and controlled based on self anisotropic dielectric characteristics and an optical axis rotation regulation and control principle to obtain processed radiation photons with changed radiation intensity; the nano waveguide is used for collecting and guiding transmission of the processed radiation photons to obtain guided wave photons which can be effectively utilized; and the substrate is used for providing a stable mechanical supporting platform for the hyperbolic dispersion structure layer, the quantum emitter and the nano waveguide. On the basis, the problem that flexible adjustment is limited by fixed parameters is solved, the flexibility, efficiency and bandwidth adaptability of spontaneous radiation regulation and control are improved, and practical application breakthrough of the high-performance quantum light source and related devices is achieved.

A measurement system for detecting deep-hole surface topography based on low-coherence interferometry (LCI) can include a detection part and an autocollimation system. The detection part includes a white light interferometric system, which specifically includes a 1550 nm amplified spontaneous emission (ASE) broadband light source, a first reflector, a first beam splitting prism, a second reflector, and a reference reflector that are arranged in sequence, where a to-be-measured deep-hole and a near-infrared camera are respectively arranged at two sides of the first beam splitting prism, and a conical prism is disposed inside the to-be-measured deep-hole. The autocollimation system is disposed between the to-be-measured deep-hole and the first beam-splitting prism. The autocollimation system includes a 630 nm light source, a dichroic prism, a second beam-splitting prism, a third reflector, and a quadrant detector that are arranged in sequence.

The invention provides a fault protection system and method for an MOPA structure fiber laser. Wherein the system comprises: an amplification stage; a main seed source; the detection module is used for monitoring the working state of the amplification stage in real time, determining a fault position in the amplification stage and generating a fault trigger signal when an abnormality is monitored; and the protection module is used for blocking an input light path and an output light path of the fault position through the isolation sub-module within a preset response time after receiving the fault trigger signal, and providing alternative seed light for a downstream amplifier through the seed supply module if the downstream amplifier exists at the fault position, so that the fault position is detected. And at least closing the amplifier corresponding to the fault position through the closing sub-module. According to the invention, the amplifier at the fault position is isolated, signal injection and intelligent closing of the downstream amplifier are maintained, and effective protection of bidirectional amplified spontaneous emission hazards is realized.

The application discloses a kind of high pumping efficiency low nonlinear effect fiber laser, sequentially connected seed source, isolator, first circulator, first combiner, first gain fiber, fiber grating, second gain fiber, second combiner, second circulator, still include first pump source, second pump source and output collimator;Fiber grating is total reflection grating, center wavelength is consistent with seed light wavelength, is set between first gain fiber and second gain fiber;Utilize fiber grating, realize the original light path reflection of seed light and secondary amplification, while pumping light transmission to fiber grating will be transmitted to continue transmission.The application can increase the action distance of seed light and gain fiber under the condition that gain fiber is shorter, secondary amplification is carried out to seed light, while effectively inhibiting spontaneous emission effect and nonlinear effect in fiber laser, while secondary utilization is carried out to residual pumping light, effectively improve pumping efficiency, and improve fiber laser performance.

The invention discloses a controlled aerosol laser-induced breakdown spectroscopy detection method and device, and relates to the technical field of laser plasma emission spectroscopy. The method comprises the following steps: placing a to-be-detected sample with fixed mass in a closed cavity filled with inert gas; ablating all the to-be-detected samples in the closed cavity by using laser with fixed wavelength, mixing ablated to-be-detected sample particles with inert gas to form aerosol with uniform mass density, and exciting the aerosol to form plasma; the plasma spontaneously emits light; one or more of pressure intensity, double-pulse excitation and resonance excitation in the closed cavity are regulated and controlled, so that the intensity of light emitted by the plasma is enhanced; and obtaining the content of the to-be-analyzed element in the to-be-detected sample according to the intensity-enhanced plasma emitted light. According to the method, the influence of the matrix effect on the laser-induced breakdown spectroscopy technology can be reduced, and the quantification accuracy is improved.

The embodiment of the invention provides a solid laser, which comprises a gain resonant cavity and a loss resonant cavity connected with the gain resonant cavity, the gain resonant cavity comprises a first cavity and a gain medium assembly arranged in the first cavity, and is used for reflecting light of the gain resonant cavity back and forth in the cavity to prolong the working length of the gain medium assembly, inhibiting spontaneous radiation of photons and improving the photon number density in the cavity; wherein the gain medium assembly is used for providing optical gain; and the loss resonant cavity comprises a second cavity and a lens system arranged in the second cavity, and is used for reducing the diffraction loss of the auxiliary resonant cavity. According to the solid laser, the composite degenerate cavity structure design is adopted, the main body gain resonant cavity and the auxiliary loss resonant cavity are separated, and the quality of output light beams is improved.

A quantum light source includes a quantum emitter located within both a bullseye cavity and a Fabry-Perot cavity. The Fabry-Perot cavity is formed from first and second mirrors that face each other to define an optical axis extending therebetween. The bullseye cavity lies in a plane perpendicular to the optical axis and in between the first and second mirrors. The quantum emitter may be a quantum dot, a point defect in a crystal (e.g., nitrogen-vacancy center in diamond), an atom, or another type of quantum system. Spontaneous emission from the quantum emitter is strongly coupled into a mode of the Fabry-Perot cavity while the bullseye cavity uses destructive interference to prevent emission of photons along directions transverse to the axis of the Fabry-Perot cavity. Light leaks out of the Fabry-Perot cavity into a well-defined traveling-wave mode that can be efficiently coupled to an optical fiber.

This invention discloses a method for noise optimization in discrete spectrum nonlinear frequency division multiplexing (DSP) systems using geometric shaping, belonging to the field of communication technology. The method includes: considering ASE noise and establishing a channel model under noisy conditions; based on the channel model under noisy conditions, designing an olive-shaped 32QAM in the DSP system; and by optimizing the geometric distribution of constellation points, mapping the optical signal to the point distribution of the olive-shaped 32QAM, reducing the probability of high-power points and minimizing the impact of accumulated spontaneous emission noise (ASE) and phase noise, thereby improving the signal's noise immunity and system transmission stability.

The invention provides an optical fiber amplifier which comprises a gain light path used for amplifying signal light; the first filter is used for filtering backward spontaneous radiation light generated when the gain light path amplifies the signal light and retaining auxiliary light meeting preset requirements; and the coupler is used for combining the auxiliary light and the new signal light to be amplified by the gain light path so as to enhance population inversion generated by amplifying the new signal light by the gain light path after beam combination. When the optical fiber amplifier amplifies the signal light, the signal light can generate stronger population inversion, so that the noise coefficient is effectively reduced, and the transmission quality of the signal light can be improved after the optical fiber amplifier is deployed to an optical communication network.

An optical signal amplification apparatus and a related optical communication device. The apparatus may include a pump light source, a combiner assembly, a doped optical fiber, and an optical filter. The pump light source may be configured to emit a pump beam. The combiner assembly is configured to combine a signal beam and the pump beam and couple a combined beam into the doped optical fiber. The doped optical fiber is configured to amplify the signal beam under excitation by the pump beam. The signal beam includes one or more single-wavelength signals. The optical filter is disposed between two ends of the doped optical fiber and configured to transmit the signal beam and filter out a first beam in the doped optical fiber. The first beam includes a beam of some wavelengths or all wavelengths generated by spontaneous emission in the doped optical fiber.

The application discloses a temperature and gas detection system and method based on ultraviolet to near infrared spectrum, relates to the technical field of spectrum measurement, and solves the technical problem that the prior art adopts two separate devices to respectively measure temperature and monitor the environment in a smelting process, occupies space in a smelting furnace, and increases the complexity of the system; the application obtains spontaneous emission light of a target to be detected; the spontaneous emission light is dispersed and spectrally analyzed to obtain spectrum data of the full wave band of ultraviolet to near infrared light; the spectrum data are denoised to obtain the spectrum of the target to be detected; temperature data are obtained according to spectrum analysis of the target to be detected; and the concentration of gas is calculated based on the spectrum and a pre-established spectrum database; the temperature of the target to be detected can be accurately measured, and the measurement accuracy is improved.

The present application provides an optical fiber amplifier, comprising: a gain optical path, configured to amplify signal light; a first filter, configured to filter backward spontaneous emission light generated by the amplification of the signal light by the gain optical path, and retain auxiliary light that meets a preset requirement; and a coupler, configured to combine the auxiliary light with new signal light to be amplified by the gain optical path, so as to enhance population inversion generated when the combined new signal light is amplified by the gain optical path.

The utility model discloses an embodiment of amplifying spontaneous emission light source. The amplifying spontaneous emission light source includes seed source and power amplifier, and the seed source is used for outputting the wide spectrum signal light of 900nm to 930nm wave band, and the power amplifier includes first doped neodymium optical fiber, first pump source and beam combiner, and the first pump source is used for outputting the first pump light, and the input end of beam combiner is connected with the output end of seed source and the output end of first pump source respectively, and the output end is connected with the input end of first doped neodymium optical fiber, and the first pump light is used for pumping neodymium ion in first doped neodymium optical fiber, so that neodymium ion is stimulated emission, and the seed signal light is amplified. The utility model solves the problem that the output power of the existing 900nm to 930nm wave band wide spectrum spontaneous emission light source is low, and it is difficult to fully meet the application requirement of high power nonlinear frequency multiplication, and realizes the stable output of high power amplifying spontaneous emission light with the center wavelength of 910-930nm.