14 results about "Stimulated emission" patented technology

The application discloses a kind of carbon dioxide laser pulse signal quality detection and anti-interference control method and system, it is related to the field of device using stimulated emission, this method includes: when enabling effective state indication is effective, external pulse width modulation signal is sampled, and the sequence of multiple-point sampling buffer is obtained, the rising edge and the falling edge of external pulse width modulation signal are determined, and the pulse period measurement value and the pulse width measurement value of current pulse are calculated;Determine the preset duty cycle interval to which the duty cycle of current pulse belongs, and generate a duty cycle interval flag;Measure power measurement value, and compare with the proportional threshold value generated based on current pulse width measurement value, to determine power abnormal state;When power abnormal state is abnormal, determine shielding period in preset mapping table according to duty cycle interval flag, generate protection control signal, and perform anti-interference control to laser. By implementing the present application, abnormal detection and anti-interference control of laser output in a larger duty cycle range can be realized.

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 discloses a photoacoustic stimulated Raman gas detection system and method based on hollow-core optical fiber seed injection enhancement, belonging to the field of laser spectroscopy trace gas detection technology. The system includes a light source and beam splitting module, a hollow-core optical fiber seed generation module, an optical delay module, and a short-path power amplification module. The main laser beam is incident on a beam splitter and splits into a first beam and a strong pump beam. In the hollow-core optical fiber seed generation module, the first beam is reflected by a fifth mirror, a hollow-core optical fiber seed generation unit, a sixth mirror, and a filter, outputting a weak seed beam. The strong pump beam enters the optical delay module and synchronizes with the weak seed beam output from the filter. In the short-path power amplification module, the weak seed beam and the strong pump beam output from the optical delay module are combined and strictly coaxial at a dichroic mirror, then focused by a convex lens and enter the short-path Raman frequency shifter. This invention achieves a significant reduction in the oscillation threshold of the Raman frequency shifter by utilizing seed light-induced stimulated emission.

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.

The present application relates to the technical field of stimulated emission devices, and particularly provides a method and system for self-similar evolution of femtosecond pulses in a chip-level waveguide, the method comprising: introducing input femtosecond pulses into an entrance section of a chip waveguide composed of birefringence heterogeneous materials; obtaining an initial pulse with internal space-time correlation; inputting the initial pulse into a distributed parameter dynamic compensation array in a middle section of the chip waveguide to form synchronous dynamic compensation for nonlinearity and dispersion, and obtaining an intermediate pulse with stable spectral width and phase distribution; inputting the intermediate pulse into an output coupler at an end of the waveguide; simultaneously solidifying a pulse time-domain envelope shape determined by dispersion truncation effect; and outputting femtosecond pulses with self-similar characteristics, stable shape and spectrum after processing by the coupler. The system comprises a space-time correlation processing module, a dynamic compensation synchronization module and a coupling processing module. The present application significantly improves controllability and output quality of femtosecond pulse evolution in an integrated waveguide.

This invention provides a 980nm fiber laser based on co-pumping by an oscillator and an amplifier, comprising a pump source, an oscillator, a filter element, and a second ytterbium-doped double-clad fiber. The oscillator includes a high-reflectivity fiber grating, a first ytterbium-doped double-clad fiber, and a low-reflectivity fiber grating. The high-reflectivity fiber grating and the low-reflectivity fiber grating together form a resonant cavity. The first ytterbium-doped double-clad fiber, located within the resonant cavity, receives the pump light and generates 980nm signal light through stimulated emission. By designing an optical path structure for co-pumping by the oscillator and amplifier, and utilizing the filter element to filter out 1030nm light while allowing residual pump light to enter the subsequent amplification stage, the unabsorbed residual pump energy in the oscillator is reused. This significantly simplifies the system size and reduces costs while solving the core problems of severe pump energy waste and low optical-to-optical conversion efficiency in existing technologies.

Disclosed herein relates to a system of and method for solid-state microwave amplification by stimulated emission of radiation (hereinafter “MASER”) and / or a sound amplification by stimulation emission of radiation (hereinafter “SASER”) used in a series of micro-drones to for monitoring, protecting, controlling, disabling, sterilizing, and / or destroying of a target. The micro-drones may form an autonomous, self-sustaining swarm, such that the micro-drones may exit and rejoin the hybrid drone swarm, automatically, optimizing monitoring by allowing at least one micro-drone to be constantly within the hybrid drone swarm around the target without requiring downtime. Additionally, the micro-drones may automatically recharge via at least one solar panel. In addition, the present disclosure may defend a user and / or area from enemy drones or enemy targets using a system of micro-drones.

This invention discloses an optimization system for laser stimulated emission devices (SEMI) in optical communication chips, relating to the field of optical communication chip technology. Addressing the problems of existing SEMI devices that only optimize in a single dimension, suffer from low fault location accuracy and poor maintenance efficiency in large-scale cluster scenarios, this invention integrates modules for control, compensation optimization, closed-loop control testing, temperature control, stress suppression, heat dissipation, anti-interference, optical coupling, power consumption control, and fault location maintenance within the device itself. These modules work together to achieve dynamic control of the epitaxial structure, lattice mismatch compensation, closed-loop control of epitaxial wafer uniformity and domestic high-frequency testing, precise temperature control and drift suppression, stress and parasitic capacitance suppression, load-adaptive heat dissipation, electromagnetic interference suppression, improved optical coupling efficiency, reduced power consumption, and precise fault location and closed-loop maintenance. This invention effectively improves device performance, stability, and maintenance efficiency, reduces maintenance and testing costs, adapts to the large-scale application of high-speed optical communication, and promotes the independent development of optical communication chip technology.

The invention discloses a laser molecule with cascade excited state double proton transfer activity, a single crystal material and a preparation method and application of the laser molecule and the single crystal material. According to the invention, the laser molecule with a specific structure and cascade excited state double proton transfer activity is designed, so that the J-type aggregate can be spontaneously formed; by utilizing the intermolecular coupling effect of J-type aggregation, the excited state energy of the tautomer B is effectively reduced, and two times of proton transfer are promoted to be completely completed in thermodynamics. The thorough cascade excited state double-proton transfer process can avoid excited state particle shunting loss and promote excitons to release energy through an excited radiation channel, so that the utilization rate of the excitons is remarkably improved, sufficient population inversion intensity and optical gain are guaranteed, and the photoelectric conversion efficiency is improved. Finally, the core problems that an existing near-infrared organic solid laser is low in exciton utilization rate and insufficient in optical gain are solved, and ultralow-threshold near-infrared laser emission is achieved.

This invention belongs to the field of laser technology and discloses a method and system for controlling the working cavity length of an ultra-stable laser system capable of achieving a magic cavity length. The method involves: acquiring the output signal generated by the laser based on the fundamental mode resonance frequency; acquiring the output signal emitted through the working cavity after stimulated emission of the atomic gain medium; performing beat frequency detection on the two output signals to obtain a beat frequency signal; determining the magic cavity length region of the working cavity based on the relationship between the beat frequency signal and the change in the working cavity length; and adjusting the cavity length of the working cavity according to the aforementioned magic cavity length region. The system includes an ultra-stable frequency reference unit for generating a signal based on the fundamental mode resonance frequency; a magic cavity length confirmation unit for determining the magic cavity length region and generating a piezoelectric ceramic adjustment signal; and a working cavity length control unit for adjusting the cavity length of the working cavity. This invention significantly improves the short-term frequency stability and environmental noise immunity of the system, providing a highly promising new path for next-generation optical clocks and precision physical measurements.

This invention proposes a gallium nitride-based semiconductor laser with a gradient peak rate electric field waveguide layer. The fitting curves of the In ion intensity distribution or In atom concentration distribution, the fitting curve of the peak rate electric field distribution, and the fitting curve of the saturated electron drift velocity distribution obtained from SIMS testing of the upper and lower waveguide layers with the gradient peak rate electric field all satisfy any one of the Logistic function, Logistic 5 function, or Nelder function, forming a high electric field barrier. Electrons transporting from the active region to the p-type layer must overcome this barrier height, suppressing electron leakage from the active region to the p-type layer. The low electric field matches the low-velocity transport of holes, avoiding enhanced hole scattering. High injection efficiency allows carriers in the active region to quickly reach the stimulated emission threshold. The saturated electron drift velocity gradually decreases from high to low, and the low saturated electron drift velocity on the active region side avoids punch-through leakage caused by high-speed electrons rushing through the active region.

The utility model provides an intelligent temperature control laser shell of special optical transmission equipment, which belongs to the crossing field of special optical fibers and lasers and comprises a shell, and a dustproof shell component and a temperature control component for cooling the lasers are mounted in the shell. According to the utility model, through the housing assembly, the laser is installed inside the housing, then the laser is started, the laser enters the resonant cavity, the laser is reflected for multiple times in the cavity through the holophote to be enhanced, the enhanced laser is stimulated by the gain medium to radiate and amplify an optical signal, and finally the laser is output through the partial reflector. And meanwhile, the residual light maintains resonance, the seam of the laser and the shell is sealed through a sealing ring, and the seams of the total reflection mirror, the partial reflection mirror, the gain medium and the resonant cavity are sealed through epoxy resin glue.

The application discloses a kind of based on single-double mode optical fiber laser's ultra-short pulse generation method and device, method includes: pump light enters erbium-doped optical fiber by double-mode wavelength division multiplexer, excitation erbium ion to upper level and form particle number inversion, produce stimulated emission, amplify laser signal;Pass through double-mode optical fiber coupler, a small amount of laser output to outside cavity and measure, remaining laser continues to oscillate in cavity;Remaining laser passes through polarization controller and adjusts the polarization state in resonant cavity, to ensure that laser is stably transmitted in cavity, utilize carbon nanotube saturable absorber to realize the mode locking of laser, ensure that stable ultra-short pulse is generated;Laser passes through double-mode isolator and ensures that optical pulse is unidirectional operation in resonant cavity, re-enters double-mode wavelength division multiplexer and forms circulation;After periodic mode coupling, finally form stable mode-locked pulse.The application is suitable for few-mode fiber mode-locked laser, with simple structure, easy to construct and maintain, with very high stability and reliability.