69 results about "Stimulated emission" patented technology

A chip-scale mode-locked laser including a cavity including a gain medium for amplifying signal electromagnetic radiation (signal) through stimulated emission, the signal comprising a signal wavelength; and a passive or active mode-locking device to enforce pulse formation in the laser. The mode-locking device includes a thin-film waveguide having a thickness on the order of the signal wavelength so as to confine and guide the signal along the thin-film waveguide, and a material comprising a second-order nonlinear susceptibility to enable active or passive mode-locking of the signal. The mode-locking device leads to generation of pulses of the signal outputted from the mode-locked laser.

A deep learning-based super-resolution fluorescence lifetime imaging microscopy (SR-FLIM) method includes the steps of: S1, performing fluorescence microscopic imaging on a sample to obtain confocal intensity images and stimulated emission depletion (STED) intensity images at a same location; S2, co-registering the acquired confocal and STED intensity images; S3, pairing the co-registered confocal and STED intensity images as input (Input) and ground truth (GT) to assemble a dataset; S4, partitioning the dataset into training and validation sets following a predefined ratio; and S5, constructing a network, and selecting hyperparameters and an optimizer. This method may achieve SR-FLIM within a conventional confocal FLIM system, surpassing spatial resolution limitations of FLIM, breaking through resolution barriers of conventional optical microscopy, while preserving normal fluorescence lifetime characteristics of fluorescent probes.

The embodiment of the invention provides an anti-resonance active optical fiber and a preparation method thereof, and belongs to the technical field of optical fibers. The anti-resonance active optical fiber comprises a solid-state fiber core doped with rare earth elements, and the solid-state fiber core is stimulated to emit and transmit laser; the plurality of anti-resonance structures are uniformly arranged at intervals around the circumferential direction of the solid-state fiber core, the refractive index of the anti-resonance structures is greater than that of the solid-state fiber core, and the anti-resonance structures are configured to generate anti-resonance for the laser in a preset wavelength mode, the solid-state fiber core is arranged in the anti-resonance structure, so that the laser which is incident to the anti-resonance structure and is in a preset wavelength mode is restrained in the solid-state fiber core; the outer cladding wraps the anti-resonance structure and the solid fiber core, and the refractive index of the outer cladding is smaller than that of the anti-resonance structure. According to the anti-resonance active optical fiber provided by the embodiment of the invention, high-power and high-single-mode laser gain and transmission functions can be realized.

The invention relates to the technical field of lasers, and provides a double-gain-medium Q-switched laser and a constant-power pulse width adjusting method.The laser comprises a first pumping source, a second pumping source, an optical fiber beam combiner, a beam shaping system and a laser resonant cavity, the laser resonant cavity comprises a reflecting mirror, a first gain medium, a second gain medium, a polarization selector, a quarter-wave plate, a Q switch and an output mirror which are arranged in sequence; the first gain medium is used for absorbing first pumping light, the second gain medium is used for absorbing second pumping light, and the pumping power of the first pumping source and the pumping power of the second pumping source can be independently controlled. By changing the pumping power of the two pumping sources, real-time adjustment of the pulse width of the laser under the constant output power is achieved, the structure is compact, and control is easy and convenient.

The invention provides a target entity detection method and device, electronic equipment and a storage medium, and relates to the technical field of target detection. In the application, a first signal is generated based on a stimulated emission frequency of a target entity, and the first signal is sent to a target area; wherein the stimulated emission frequency belongs to a preset radio wave frequency range, and the first signal is used for detecting whether a target entity exists in the target area; receiving a second signal from the target area, and performing quantum state feature extraction on the second signal to obtain a feature extraction result of the second signal; if the feature extraction result comprises the quantum state identifier of the target entity and the second signal is determined not to be the first signal based on the feature extraction result, determining that the target entity exists in the target area; wherein the quantum state identifier is related to the stimulated emission frequency. Therefore, the detection accuracy of the target entity is improved.

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.

Apparatuses, methods, and systems for a modulated laser are disclosed. The modulated laser includes a substrate including a plurality of laser segments, a first laser segment comprising a DC electrode, a second laser segment comprising an AC electrode, an isolation barrier formed between the first laser segment and the second laser segment, and a modulated laser cavity spanning from a rear face to a front face of the modulated laser inclusive of the plurality of laser segments, wherein a primary injection current supporting stimulated emission at a desired optical output power out of the front face of the modulated laser is generated when a DC bias is applied to the DC electrode, and wherein a carrier signal of the modulated laser is modulated when an AC signal is applied to the AC electrode, wherein the AC bias is independent of the DC bias.

The invention discloses a photoacoustic stimulated Raman gas detection system and method based on hollow-core optical fiber self-seed injection enhancement, and belongs to the technical field of laser spectrum trace gas detection, the system comprises a light source and beam splitting module, a hollow-core optical fiber seed generation module, a light delay module and a short optical path power amplification module; the main laser beam is split into a first light beam and strong pump light after entering the beam splitter; in the hollow-core optical fiber seed generation module, a first light beam passes through a fifth reflecting mirror, a hollow-core optical fiber seed generation unit, a sixth reflecting mirror and an optical filter, and weak seed light is output; the strong pump light is synchronized with the weak seed light output from the optical filter after entering the optical delay module; in the short-optical-path power amplification module, weak seed light and strong pump light output by the light delay module are combined at a dichroscope and are strictly coaxial, and then are focused by a convex lens and enter a short-optical-path Raman frequency shifter. According to the invention, the oscillation starting threshold of the Raman frequency shifter is greatly reduced by utilizing seed light-induced stimulated radiation.

The invention belongs to the technical field of laser, and particularly discloses a high-efficiency laser chip of a direct pumping light-emitting layer and a laser, and the laser chip comprises a substrate layer, an integrated broadband reflector, an integrated active region, a window layer and a protection layer which are sequentially arranged. The integrated broadband integrated active area comprises a plurality of active groups, each active group comprises spacing layers and light-emitting layers, and the spacing layers and the light-emitting layers are alternately arranged; after the light-emitting layer absorbs photon energy of pump light, a carrier at the top of a material valence band of the light-emitting layer is excited to a material sub-energy level of the light-emitting layer and then relaxed to the bottom of a material conduction band of the light-emitting layer, and stimulated radiative transition is generated in the light-emitting layer. According to the invention, the light-emitting layer of the active area can be directly pumped, so that the wavelength of the pumping light source required by the laser chip is close to the laser wavelength, thereby greatly improving the light-light conversion efficiency of the chip, reducing the quantum loss in the laser generation process, reducing the waste heat in the laser chip, relieving the heat effect of the laser, and improving the production efficiency of the laser chip. The output power of the laser is improved.

The invention belongs to the technical field of optical microscopic imaging, and discloses a microscopic imaging system and a stimulated radiation loss microscope. The microscopic imaging system comprises an illumination mechanism used for providing a first light beam and a second light beam which are coaxially incident; the phase modulation optical device comprises multiple layers of diffractive optical elements, and the multiple layers of diffractive optical elements are arranged at intervals in the transmission direction of the first light beam and the second light beam and used for conducting phase modulation and convergence on the first light beam and the second light beam in a matched mode. And the first light beam and the second light beam can form a first light spot and a second light spot at the focal plane of the stimulated radiation loss microscope, and the first light spot and the second light spot are in one-to-one correspondence and coincide in center. According to the technical scheme of the invention, the stimulated radiation depletion microscope can be normally matched with a commercial laser which has a large bandwidth and wavelength drift and is used as an excitation beam and a depletion beam.

The invention discloses a confocal interference scattering-stimulated radiation loss super-resolution composite microscope system and application thereof. The system comprises an STED module, a confocal module, an iSCAT module, a sample and objective lens module and a pinhole module. The STED module is used for generating STED light to coaxially irradiate a sample with the laser of the confocal module; the confocal module is used for generating fluorescent laser and generating light signal light splitting and filtering for a sample; the iSCAT module is used for generating laser and detecting interference scattering signals; and the pinhole module is arranged on a conjugate image surface of the confocal module and has a function of continuously adjusting the aperture size. According to the invention, by integrating the iSCAT and STED channels in the same confocal light path, synchronous acquisition of non-label scattering signals and fluorescent super-resolution images in the same visual field, the same time and the same space focal plane is realized for the first time, and the channels share a scanner, a pinhole structure and a relay optical path, so that the accuracy of the system is improved. And a high-performance imaging scheme with a compact structure and integrated functions is realized.

A method of producing an array of stimulated emission light emitting devices comprises: forming a plurality of layers of material; forming a dielectric mask layer over the plurality of layers, the dielectric mask layer having an array of holes through it each exposing an area of one of the layers of semiconductor material, and growing a light emitting structure in each of the holes arranged to emit light of at least one wavelength by stimulated emission. At least one of the plurality layers forms an upward reflector arranged to reflect light of said at least one wavelength.

The invention relates to the technical field of intelligent sensing, in particular to a method for measuring an underground water migration path by utilizing a tracer agent, which comprises the following steps: synchronously acquiring two paths of signals according to the action of pump light and probe light on a fluorescein sodium tracer agent in a pore medium, and the returned stimulated light and the local oscillation light subjected to frequency shift by the acousto-optic modulator are interfered to generate an interference beat frequency electric signal. Two different optical signals from the same tracer block mass are synchronously collected and deeply analyzed, multi-dimensional and high-precision representation of the underground water migration process is achieved, returned stimulated emission light is interfered with local light, spectrum analysis is carried out on interference beat frequency signals, and the accuracy of the underground water migration process is improved. The instantaneous flow velocity value reflecting the motion state of the tracer agent block mass can be obtained, the limitation that the flow velocity is calculated by depending on the average time between two points traditionally is avoided, and the real dynamic change rate of the fluid in the complex pore medium can be captured.

The invention discloses a carbon dioxide laser safety protection method and system based on directional coupling, and relates to the field of devices utilizing stimulated emission, and the method comprises the steps: collecting a forward signal outputted by a power supply of a carbon dioxide laser and a reverse signal reflected by a load through a directional coupler, and determining a forward voltage and a reverse voltage; calculating a reflection coefficient according to the forward voltage and the backward voltage, and calculating a voltage standing wave ratio according to the reflection coefficient; collecting audio data in the operation process of the carbon dioxide laser through an audio sensor, and extracting to obtain audio features; when the voltage standing wave ratio exceeds a normal operation threshold value, determining a first fault judgment result based on the voltage standing wave ratio; the audio features are matched with a preset fault feature library, and a second fault judgment result is determined; and based on the first fault determination result and the second fault determination result, generating a fault processing instruction and executing the fault processing instruction. According to the invention, the equipment maintenance efficiency can be improved.

Spontaneous and stimulated emission devices such as edge emitting laser diodes and vertical cavity surface emitting lasers operating in the visible spectrum and in the infrared spectrum between 380 mm and 1600 nm, and to the application of the light-emitting devices are disclosed. The devices are based on relaxed InGaN to provide strain-balanced epitaxial layer stacks.

The invention provides an object detection method and device, electronic equipment and a storage medium, and relates to the technical field of detection. In the application, in response to an object detection request for a target area in which a to-be-detected object is located, an object detection signal is generated based on a stimulated emission frequency of the to-be-detected object; the object detection signal is used for detecting a to-be-detected object, so that the to-be-detected object generates a stimulated emission signal based on the object detection signal; sending an object detection signal to the target area and the target object, obtaining a first bio-electricity signal generated when the target object receives the object detection signal, and obtaining a second bio-electricity signal generated when the target object receives the stimulated emission signal; and determining a detection result of the to-be-detected object based on a bio-electricity signal difference between the first bio-electricity signal and the second bio-electricity signal. Therefore, accurate and efficient object detection can be realized in a complex environment through the bioelectricity signal difference of the target object when the target object receives the object detection signal and the stimulated emission signal.

A pulse type carbon dioxide laser control method, system, medium and product, relates to the field of devices utilizing stimulated emission, and the method comprises: collecting a pulse signal of a target laser to obtain historical voltage data; determining a historical reference period, a historical pulse width and a historical peak voltage, and calculating a historical duty cycle; obtaining a pulse signal of a current period to obtain current voltage data and determine a current period starting time; inputting the historical duty cycle, the historical peak voltage and the current voltage data into a data simulation model to obtain a predicted duty cycle and a predicted peak voltage of the current period; determining a maximum allowed duty cycle corresponding to the predicted peak voltage, and taking the smaller value between the predicted duty cycle and the maximum allowed duty cycle as a target duty cycle; calculating a target pulse width and a signal adjustment period; and generating a driving pulse signal and outputting the driving pulse signal to a resonant cavity. By implementing the present application, damage of a triode caused by overvoltage or heat accumulation can be avoided, thereby reducing maintenance cost.

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.

One example includes an electrometer system. The system includes a sensor cell comprising an alkali metal vapor within. The system also includes an excitation beam system configured to provide at least one excitation optical beam through the sensor cell to excite the alkali metal atoms from a ground state to a Rydberg energy state. The system also includes a stimulated emission beam system configured to provide a stimulated emission optical beam through the sensor cell to provide energy decay of the alkali metal atoms to a decay energy state that is less than the Rydberg energy state. The system further includes a detection system configured to monitor fluorescent detection light emitted from the alkali metal atoms as the alkali metal atoms decay from the decay state to the ground state to determine signal characteristics of an external signal based on an intensity of the fluorescent detection light.

The invention provides a reverse pumping free space isolator which is low in cost, stable and reliable in light output and suitable for high-power occasions and an optical signal processing method. The isolator comprises an isolator body (1), a pump light coupling assembly (2), a signal end active optical fiber (3), a dichroic mirror (4), a pump light processing assembly (5) and a pump light source. The method comprises the following steps: S1, converting pump light with the wavelength of 976nm into parallel light through a collimating lens; s2, converting the parallel light into an annular Bessel-Gaussian beam by using a conical mirror; s3, expanding and collimating the annular light through a biconvex spherical lens to form an annular pumping light spot adaptive to fiber cladding coupling; s4, reflecting the pump light at 45 degrees by using a dichroic mirror, and coupling the pump light to a signal end active optical fiber; and S5, the signal light enhanced by stimulated radiation is transmitted by the dichroic mirror and then enters the isolator body for subsequent processing. The optical isolator is applied to the technical field of optical isolators.

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.

A hybrid optical fiber amplifying device is proposed that is based upon a concatenated combination of a section of Tm-doped fiber (TDF) followed by a section of Ho-doped fiber (HDF). The doped fiber sections are configured to be no more than a few meters in length. Using the sections of doped fiber in this order (i.e., TDF followed by HDF) has been found to provide amplification of input signals over a relatively wide wavelength band from about 1725 nm to about 2105 nm (thus exhibiting a useful wideband range of about 380 nm). The use of pump beams operating at several Watts of power have been found to yield multi-Watt output signals. The wideband hybrid device itself may take the form of an amplifier, laser (including a ring laser configuration), or a source of amplified stimulated emission (ASE).

A communication system is disclosed that features a computing device, a radiating element coupled to the computing device and including a primary helical coil, a secondary helical coil positioned within the primary helical coil, one or more inductor coils that are free to rotate positioned within the secondary helical coil, an optohelical antenna, a central core positioned within the one or more inductor coils, one or more central core coils positioned within the central core, and a central core cavity positioned within the one or more central core coils, in which the central core cavity includes a plasma and / or a gain medium which exhibits magnetic resonance, spontaneous emission, stimulated emission, and / or absorption. The communication system includes a signal injection circuit, a signal detection circuit communicatively coupled to the computing device, and a control module communicatively coupled to the computing device to determine a mode of a transceiver module.

The utility model relates to a three-frequency coupling resonance water molecule nanocluster optimization filtering device which comprises a pipe body, a sound wave oscillation generator is arranged in the pipe body, a terahertz waveguide layer is arranged on the inner surface of the pipe body, an electromagnetic coil is arranged on the outer surface of the pipe body, and when water flows through the pipe body, the electromagnetic coil is arranged on the inner surface of the pipe body. Water is in frictional contact with the terahertz waveguide layer, the terahertz waveguide layer is stimulated to emit terahertz waves to penetrate through the water, the electromagnetic coil emits extremely-low-frequency electromagnetic waves to penetrate through the water, and the sound wave oscillation generator actively emits sound waves to penetrate through the water. When the device is used as a filter element for filtering water, terahertz waves, extremely-low-frequency electromagnetic waves and sound waves cooperatively resonate to activate water. Compared with the prior art, stable micromolecule nanocluster water is generated, and the activation effect of the water is improved.

The utility model relates to resonant cavity variable laser teaching equipment, which comprises a laser source, a resonant cavity, a shell and a laser power meter, and is characterized in that the laser source is used for emitting pump light; the resonant cavity comprises a convergence optical system, a laser medium and an output mirror, laser emitted by the laser source is coupled to the end face of the laser medium through the convergence optical system, the laser medium realizes stimulated radiation, absorbs pump light, emits laser and forms laser gain under excitation of the laser, and the high-reflectivity mirror is used for reflecting photons. The output mirror is used for allowing part of photons to escape to form laser output, and the distance between the output mirror and the laser medium is adjustable; the laser power meter is used for measuring the power of laser output, and the convergence optical system is arranged in the shell. The distance between the output mirror and the laser medium is adjustable, so that the length of the resonant cavity is changed, the light emitting power is changed, and students can conveniently know the relation between the length of the resonant cavity and the light emitting power.

The invention belongs to the technical field of optical microscopic imaging, and discloses a microscopic imaging system and a stimulated radiation loss microscope. The microscopic imaging system comprises an illumination mechanism used for providing a first light beam and a second light beam which are coaxially incident; the annular partition phase modulation element comprises a first phase modulation area and a second phase modulation area connected to the peripheral side of the first phase modulation area, the first phase modulation area is circular, and the second phase modulation area is annular; the first phase modulation area and the second phase modulation area are configured to perform phase modulation and convergence on a first light beam and a second light beam which are vertically incident respectively, so that a first light spot and a second light spot which are in one-to-one correspondence and coincide in center are formed on the focal plane of the stimulated radiation loss microscope respectively. According to the technical scheme, light energy loss caused when the microscope adopts a high-numerical-aperture illumination objective lens is improved, miniaturization of the system is facilitated, and the imaging quality is improved.

This invention relates to the field of organic optoelectronic functional materials technology, providing a class of organic near-infrared luminescent dye compounds, their crystals, and applications. The materials of this invention include a series of compounds composed of a 4-(dimethylamino)phenyl and cyanoacrylate conjugate backbone, as well as maronitrile derivatives. They possess simple structures and small molecular weights, and can be efficiently synthesized via a one-step Knoevenagel condensation reaction. This process is simple, low-cost, and easily industrialized. The emission wavelength and performance can be adjusted by changing the end-group substitution or acceptor type. The materials exhibit good self-assembly ability and high crystallinity in the solid state, enabling the formation of stable laser gain media. They achieve stable laser output with narrow spectrum, high brightness, and low threshold in the near-infrared band, with a photoluminescence quantum yield of 24% and excellent stimulated emission performance. The materials possess good chemical stability and device compatibility, showing broad application prospects in near-infrared solid-state dye lasers, optical communications, fiber optic amplifiers, and other fields.

The utility model discloses an inner cavity frequency doubling blue light fiber laser welding device based on a fiber bragg grating, and relates to the technical field of fiber lasers. The semiconductor pump light source is connected to the input end of the optical fiber wavelength division multiplexer, the output end of the optical fiber wavelength division multiplexer is sequentially connected with the ytterbium-doped optical fiber, the frequency doubling crystal and the end face reflector, and the optical fiber bragg grating is obtained by adopting a purple light mask method in an inscribing mode, connected to the other input end of the wavelength division multiplexer and then sequentially connected with the dichroscope, the collimator and the welding head. Under excitation of pump light, ions in the ytterbium-doped optical fiber generate stimulated radiation, laser oscillates in a resonant cavity formed by the fiber Bragg grating and the end face reflector, 490 nm blue light is generated through the frequency doubling crystal, the blue light is transmitted through the two-phase color mirror, 980 nm light is reflected through the two-phase color mirror, and finally the laser is output through the welding head. The fiber bragg grating is high in inscribing resolution, high in stability, high in production efficiency, high in inner cavity frequency doubling electro-optical conversion efficiency, high in quality of output blue light beams, compact in structure and suitable for welding of high-reflectivity materials.