51results about How to "Realize all-fiber" patented technology

The invention relates to a laser of semiconductor laser seed pulse principal oscillation enlarge entire optical fiber, the output of the seed light system connects to the optical fiber amplifier with the optical fiber isolator. The seed light system includes the signal mixer, the bias current supply and the modulation supply oscillator which meets the signal mixer input end, the semiconductor laser chip which meets the signal mixer out-port, the out-port of semiconductor laser chip constitutes the out-port of the seed light system. The optical fiber amplifier includes the optical fiber optical coupler, the semiconductor laser which meets the input end of the optical fiber optical coupler, the doping optical fiber which meets the out-port of the optical fiber optical coupler, the another end of the dopes optical fiber constitutes the out-port of the optical fiber amplifier. The input end of optical fiber optical coupler constitutes the input end of the optical fiber amplifier. The invention has solved the technical question of big volume, bad stability in the background technology. The invention has used the entire optical fiber structure, the frequency of the output laser is adjustable, the pulse width is adjustable.

The invention discloses a linear-cavity active Q-switching all-fiber laser. The laser is characterized in that a linear cavity is provided, the output tail of a pumping semiconductor laser is connected with the pumping input port of a fiber beam combiner; the fiber output port of the fiber beam combiner is connected with a high-reflectivity fiber bragg grating; the other terminal of the high-reflectivity fiber bragg grating is welded with gain fibers together; the other terminal of the gain fibers is welded with a low-reflectivity fiber bragg grating formed on polarization-preserving fiber; an adjustable piezoelectric element signal drive circuit is used for driving a piezoelectric element to press fiber in the cavity periodically to modulate the polarization direction of light; the other terminal of the low-reflectivity fiber bragg grating is connected with the input terminal of a fiber isolator; and the output fiber is connected with the output terminal of the fiber isolator. The laser provided by the invention has the advantages of little insertion loss, simplified structure, high repeating frequency of laser pulses, low cost and easiness in industrialization. Large-diameter core double-cladding gain fibers can be used in the laser cavity, so that high-energy high-power laser pulses can be obtained conveniently.

The invention relates to technical fields of optical fibers and laser, and specifically relates to an incoherent beam combination-based high-energy nanosecond pulse all-fiber laser. The incoherent beam combination-based high-energy nanosecond pulse all-fiber laser is characterized by comprising a nanosecond pulse seed laser, an optical fiber beam splitter, optical fiber amplifiers, synchronous optical paths, an optical fiber beam combiner and a laser output end, wherein the output end of the nanosecond pulse seed laser is connected with the input end of the optical fiber beam splitter; the corresponding optical fiber amplifiers are arranged at the output ends of the sub paths of the optical fiber beam splitter respectively; the optical fiber beam splitter is used for performing branching on an optical signal from the nanosecond pulse seed laser, and then performing amplification on each sub path optical signal of the optical fiber beam splitter separately; the output ends of the sub paths of the optical fiber beam splitter are connected with the input ends of the corresponding optical fiber amplifiers; the output ends of the optical fiber amplifiers are connected with the input end of the optical fiber beam combiner through the synchronous optical paths separately; and the output end of the optical fiber beam combiner is connected with the laser output end. The incoherent beam combination-based high-energy nanosecond pulse all-fiber laser has the advantages of high average power, high pulse energy, small size, easy maintenance, stability, reliability and the like.

The invention belongs to the field of laser devices, and particularly relates to an acousto-optic Q-switched ytterbium-doped all-fiber laser. In order to solve the problems of low coupling efficiency, high maladjustment sensitivity, complex experimental facilities and the like caused by separated component structure in Q-switched fiber laser, the invention adopts a technical proposal of the acousto-optic Q-switched ytterbium-doped all-fiber laser which comprises a fiber bragg grating (FBG), an acousto-optic modulator (AOM) with tail fiber, a multimode coupler, two pumping light-emitting diodes (LDs), ytterbium-doped double-clad fiber and output tail fiber, wherein the two pumping LDs couple pumping light to the ytterbium-doped double-clad fiber respectively by the multimode coupler; the ytterbium-doped double-clad fiber is connected between the output terminal of the multimode coupler and the output tail fiber; the FGB is connected to a signal terminal of the multimode coupler by the AOM with tail fiber, and forms a resonant cavity with the end surface of the output tail fiber simultaneously; and alternating voltage is applied on the AOM. The invention is mainly used in the manufacturing and designing of lasers.

Based on the principle of dual-cavity coupling, the present invention realizes an integrated all-fiber passive Q-switched pulsed fiber laser through in-band pumping, fully utilizes the wide absorption bandwidth and emission bandwidth of the doped gain fiber and there is a considerable overlap between the two range characteristics, the working band of the resonator is reasonably designed, and the dual functions of laser radiation gain and saturation absorption are realized in the doped gain fiber. The radiation laser of the first resonator is used to pump the second resonator, and the coupling cavity is realized. All-fiber integrated passive Q-switched pulsed fiber laser. At the same time, the difference between the core diameter of the second resonant cavity doped gain fiber and the first resonant cavity doped gain fiber is used to increase the energy density of the laser in the second resonant cavity doped gain fiber and improve the passive saturable absorber. Bleach switch ability. The pulsed fiber laser of the present invention has compact structure and stable performance, and truly realizes the all-fiberization of the pulsed fiber laser.

The invention is applicable to the technical fields of optical fiber and fiber lasers, and provides photonic bandgap fiber (PBGF). The PBGF comprises a cladding layer and a fiber core wrapped in the cladding layer, wherein, the internal cladding layer is formed by a ring composed of large air holes, and the internal cladding layer contains germanium (Ge)-doped glass wires; and the fiber core contains a fluorine (F)-doped area with low refractive index. In the invention, slight refractive index subsidence is applied to the fiber core of the all-solid-state PBGF, which effectively enhances resonance coupling between a mode field and the Ge-doped glass wires in a 'loss zone' and further reduces the number of the Ge-doped glass wires in the cladding layer and absorption of the glass wires in the cladding layer on pump light.

The invention provides a D-shaped fiber-based cross-polarization beat laser and a sensor. The laser comprises a pump laser, a wavelength division multiplexer connected with the pump laser, a first fiber Bragg grating, one end of which is connected with the wavelength division multiplexer, a second fiber Bragg grating, one end of which is connected with an output fiber, and an erbium-doped D-shaped fiber which is encapsulated between the other end of the first fiber Bragg grating and the other end of the second fiber Bragg grating, wherein the first fiber Bragg grating, the second fiber Bragg grating and the erbium-doped D-shaped fiber are integrated on one fiber. The distributed fiber grating is adopted as a reflector to form an ultrashort resonant cavity, and the cavity length can be effectively shortened, so that the laser can run in a single-longitudinal-mode state, and the generated laser has good coherence. The D-shaped fiber is used as the body of the resonant cavity, the constraining performance of the resonant cavity on light can be reduced, and part of the transmitted light is leaked from one side to form an evanescent field which is sensitive to external environment changes, so that induction of a specific parameter can be realized.

The invention belongs to the technical field of fiber lasers, and particularly relates to an incoherent super-continuum spectrum light source with controllable spectrum and tunable output power. The incoherent super-continuum spectrum light source comprises a random pulse fiber laser, a single-mode fiber, a double-clad ytterbium-doped/tapered ytterbium-doped fiber amplifier and a highly-nonlinearintermediate infrared soft glass fiber. The incoherent super-continuum spectrum light source can realize three modes of incoherent super-continuum spectrum output such as a near-infrared band or an intermediate infrared band, a visible light-near infrared band or a near infrared-intermediate infrared band and a visible light-intermediate infrared band through selecting different super-continuum generation modules. In addition, through performing combined control on the length of the single-mode fiber, the output power of a pumping source in the double-clad ytterbium-doped/tapered ytterbium-doped fiber amplifier and the length of the highly-nonlinear intermediate infrared soft glass fiber, the incoherent super-continuum spectrum light source not only can realize control on the output spectrum range and shape, but also can realize tunable output power of the super-continuum spectrum under the condition that the output spectrum range and shape are fixed.

The invention belongs to the technical field of trace gas detection, and provides a scattering enhanced gas sensing probe comprising a metal shell, a non-resonant photo-acoustic cavity, a porous scattering medium, a fiber F-P sonic sensor sensitive film, a gold-plated reflector, a photo-acoustic excitation light source incident fiber, a fiber collimator, a fiber F-P sonic sensor detection light source incident fiber, a F-P cavity, an air inlet and an air outlet, wherein the metal shell is detachably connected with one end of the non-resonant photo-acoustic cavity, and the gold-plated reflectoris fixed at the other end of the non-resonant photo-acoustic cavity; the porous scattering medium is filled into the non-resonant photo-acoustic cavity; a groove is formed in one surface of the metalshell and sealed by the fiber F-P sonic sensor sensitive film, and thus the F-P cavity is formed; the metal shell is provided with the fiber F-P sonic sensor detection light source incident fiber andthe photo-acoustic excitation light source incident fiber. The scattering enhanced gas sensing probe can improve the absorption optical distance of the gas, and enhance the detection sensitivity of the trace gas.

The invention discloses a fiber grating wavelength demodulating device based on a saturable absorption fiber. The device comprises a pumping source, a gain fiber, the saturable absorption fiber, a circulator, an annular cavity or linear cavity fiber laser formed by a fiber grating to be measured and a photoelectric detection system used for measuring the repetition frequency of lasers. By measuring the repetition frequency of the lasers, wavelength changes of the fiber grating to be measured are obtained through calculation, and wavelength demodulation is achieved. The fiber grating wavelength demodulating device based on the saturable absorption fiber avoids using spectral analysis equipment and thus lowers the wavelength demodulation cost. Meanwhile, an all-fiber demodulating system is obtained, the demodulating system is made to be small in size, easy to maintain and easy and convenient to use.

The invention relates to a nanosecond pulse fiber laser with a circle structure, belonging to the technical field of lasers. The laser mainly comprises a pumping source (1), a WDM (wavelength division multiplexer) (2), a gain fiber (3), a fiber beam splitter (4), an output end (5) of the fiber beam splitter, a first glass sleeve (6), a first auto-focusing lens (7), a saturable absorber (8), a second auto-focusing lens (9), a second glass sleeve (10), a fiber circulator (11), an FBG (fiber Bragg grating) (12), a reflector (13) and a fiber isolator (14). The glass sleeves, the auto-focusing lenses and the saturable absorber are bonded together to form a miniaturized Q-adjusting component, thus realizing the overall fiber of the fiber laser and reducing the interferences from other external factors. The nanosecond pulse fiber laser has the advantages of small volume, low cost, overall fiber, simple structure, wide application prospects and the like.

The invention discloses a cascaded pumping all-optical fiber cable polarization mode-locked laser device, which comprises a cascaded pumping system, a main oscillator loop and a nonlinear optical loopmirror system. By adopting the cascaded pumping all-optical fiber cable polarization mode-locked laser device, mode-locked pulse output is realized without using a space component, and the cascaded pumping all-optical fiber cable polarization mode-locked laser device has the advantages of simple design, compact structure, high stability and high efficiency.

The invention discloses an all-solid-state high-speed rotation measurement system based on an optical fiber structure. Its three sets of orthogonal optical fiber gyroscope modules and optical fiber metering modules share a light source, and three axial optical fiber gyroscope modules and three axial optical fiber gyroscope modules The optical fiber metering modules share a detector respectively, and multiplexing technology is used to extract motion information in three orthogonal directions. The whole system is uniformly controlled by the central processor to realize the fusion of the fiber optic gyroscope module and the fiber optic metering module. The present invention realizes the all-solid-state, all-optical, integration and integration of the entire inertial measurement system, which not only saves resources and costs for the system, reduces power consumption, but also improves the stability and reliability of the system, providing a The upgrade provides strong technical support.

A device for measuring a stimulated brillouin scattering gain spectrum of a low-temperature optical fiber comprises a continuous optical fiber laser device, an optical fiber isolator, a 1*2 optical fiber beam splitter, a doubly clad optical fiber amplifier, an optical fiber circulator, a temperature control system, a monomode optical fiber, a 2*2 port 3dB beam splitter, a band-pass filter, a photoelectric detector and an electrical-graphic analyzer. The optical fiber can be refrigerated in a temperature-controllable manner by using liquid nitrogen, the stimulated brillouin scattering gain spectrum in the optical fiber is measured by using an optical heterodyning detecting technology, and measurement accuracy can be improved. The device can realize all-fiber laser, and is controllable in temperature, compact in structure and high in measurement accuracy.

An optical fiber smoke sensing temperature fire automatic alarm linkage control system is provided. The system comprises a fire linkage controller, at least one smoke fire alarm controller, and at least one temperature fire alarm controller. The fire linkage controller is in a signal connection with the smoke fire alarm controller and the temperature fire alarm controller by using the optical fiber; the fire linkage controller, the smoke fire alarm controller, and the temperature fire alarm controller are in a signal connection with a manual fire alarm button, a manual fire hydrant button, a linkage control device, and a fire extinguishing controller by using the optical fiber; and the smoke fire alarm controller and the temperature fire alarm controller are in a signal connection with a corresponding fiber-optic smoke-sensed detector and a corresponding fiber-optic temperature-sensed detector by using the optical fiber. According to the design of the present invention, not only the optical fiber technology can be used to build a fire alarm system with a better fire alarm effect, but also high precision, strong safety and a wide control area can be realized.

A long and short laser pulse synchronization device is applicable to high precision time synchronization between short laser pulses and arbitrarily-shaped long laser pulses, and a stable relative time relation between multiple paths of laser pulse signals is realized. Beam splitting is carried out on light outputted by a short laser pulse system by a 1*2 beam splitter, a beam of light obtained through beam splitting sequentially passes through an optical pulse accumulation device, a high-speed photoelectric tube, a fast comparator and a first wideband high speed electric amplifier, and after outputted square wave electrical signals are subjected to shaping of an aperture coupled microstrip line shaping plate and amplification of a second wideband high speed electric amplifier, the signals are inputted to a radio frequency input end of an amplitude modulator. In addition, output light of a long pulse laser enters the amplitude modulator via a second adjustable delay device, and the amplitude modulator outputs shaped light pulses. The relative time jitter between light pulses outputted by the shaped light pulses and the short pulse laser system is 3.5 ps (mean square root, five hours), the repetition frequency can achieve MHz order of magnitude, and the device of the invention has the advantages of compact structure, reliable work, low cost and easy extension.

The invention discloses a mode-locked fiber laser based on self-phase modulation. The mode-locked fiber laser comprises a wavelength division multiplexer, a semiconductor laser, a gain fiber and a band-pass filter. Laser pulses emitted by the semiconductor laser are coupled into the gain optical fiber through the wavelength division multiplexer. The spectrum is broadened nonlinearly under the action of self-phase modulation, the width of the laser pulse is in positive correlation with the broadened spectrum, the spectrum broadening reaches the filtering range of an optical filter in the band-pass filter so as to improve the transmittance of the optical filter to the spectrum, and a saturable absorption mechanism is formed so as to realize mode locking. The mode-locked fiber laser has the advantages that the structure of the fiber laser is simplified, the monopulse energy of the laser is improved, the spectral width of pulses is increased, the pulse width of the pulses is reduced, and the peak power of the pulses is improved.

The invention relates to a fluorescence detection system and method based on a double-core photonic crystal fiber. A to-be-detected fluorescence sample solution is poured into an air hole of the double-core photonic crystal fiber through a liquid absorption device; one end of the double-core photonic crystal fiber is connected to a spectrometer module, and the other end of the double-core photonic crystal fiber is connected to a laser through a single-mode fiber; a first fiber core in the double-core photonic crystal fiber outputs excitation laser; a second fiber core in the double-core photonic crystal fiber outputs a fluorescence signal; and the fluorescence signal is coupled to a spectrograph module for subsequent analysis. Background laser can be effectively filtered, the micro-fluidic function and the fluorescence excitation enhancing function are achieved, and a good detection effect can be obtained under the condition that only a small number of samples are consumed.

The invention discloses an all-fiber polarizer and a preparation method. According to the polarizer, acting surfaces and a metal film are designed on a double-clad fiber, a stripping area is arranged in the middle of a coating layer of the fiber, two acting surfaces are processed on a cladding corresponding to the stripping area, the acting surfaces are symmetrically distributed on the two sides of a fiber core and are parallel to each other, and a layer of metal film is plated on each acting surface. The preparation method disclosed by the invention comprises the steps of firstly, stripping part of the coating on the coating layer; then grinding the cladding to obtain two acting surfaces which are symmetrical and parallel to each other; secondly, plating a layer of metal film on the two acting surfaces; and finally, packaging a coating layer stripping area by using a glass tube. The all-fiber polarizer provided by the invention can be directly welded with the output end of a polarization-maintaining fiber laser, greatly improves the extinction ratio of polarization-maintaining laser while ensuring the transmission efficiency, can realize laser single-mode transmission, ensures that the light beam quality is not degraded, and has the advantages of simple structure, low cost, capability of realizing all-fiber and the like.

The invention relates to a coupling structure and a packaging method of an SESAM (semiconductor saturable absorber mirror) and an optical fiber. The coupling structure comprises an optical fiber optical path switching device, a plug, an SESAM mounting base and a multi-axis mounting frame, wherein the SESAM mounting base is arranged on the optical fiber optical path switching device; the plug comprises micropores, and the optical fiber passes through the micropores from one end face of the plug to the other end face of the plug. The other end surface of the plug and the mirror surface end of the SESAM7 are sealed in a closed space; the SESAM is mounted on the SESAM mounting base, and the multi-axis mounting frame clamps the SESAM mounting base to adjust the relative distance and angle between the mirror surface end of the SESAM and the other end surface of the plug, so that each working point of the SESAM corresponds to the position of each optical fiber passing through the plug; pointchanging work of the SESAM is achieved through switching of the multiple optical fibers, the utilization rate of the SESAM is increased, the service life of the SESAM is obviously prolonged, and the maintenance cost of the laser is reduced. The coupling mode is simple in structure, feasible in operation, low in cost and compact in size, realizes all-fiber and replaceable points of the SESAM, and is very beneficial to batch production of fiber ultrafast lasers.