60 results about "2 μm laser" patented technology

The invention discloses a 2 mu m all-fiber coherent laser Doppler wind finding radar system, which consists of a 2 mu m off-axis Cassegrain optical antenna system, a 2 mu m laser beam splitting system, a 2 mu m seed implantation laser amplifier, a 2 mu m monitoring detector system, and a 2 mu m balanced heterodyne detection system. The system overcomes the defect of ambient interference existing in a free space optical path, overcomes the influence of shot noise on heterodyne reception signal-to-noise ratio, and solves the problems of all fiber and miniaturization of the 2 mu m all-fiber coherent laser Doppler wind finding radar system, so that the 2 mu m all-fiber coherent laser Doppler wind finding radar system has a more compact structure. In addition, the system has the characteristics of safe laser for human eye, optical path connection by adopting flexible optical fiber devices, high operability and stability, low cost, good real time, long effectively measured distance, high measurement accuracy (speed measurement and distance measurement) and the like, and has high practical value in the field of coherent laser Doppler wind finding radar.

The invention discloses an acousto-optic modulation-based 2mu m polarized orthogonal laser emitting system applied to a laser heterodyne interferometer, which relates to a polarized orthogonal laser source emitting system. The system solves the problem of low measurement precision of the laser heterodyne interferometer due to polarized mixing error of the conventional orthogonal polarized light source emitting system. The system comprises a 2mu m laser device, a plurality of fiber collimators, a polarization sheet, a fiber beam splitter, two acousto-optic frequency shifters, a polarization controller, a polarized beam splitter prism and a plurality of fibers, wherein the laser of the 2mu m laser device passes through the fiber collimators and the polarization sheet and then enters the fiber beam splitter, the input laser is split into two beams of P laser by the fiber beam splitter, one beam of P laser enters one acousto-optic frequency shifter through the fibers to perform frequency shift and then enters the polarized beam splitter prism, the other beam of P laser is subjected to frequency shift and then enters the polarization controller, the polarization controller converts the P laser into S laser and outputs the S laser to the polarized beam splitter prism, and the P laser and the S laser form an orthogonal polarized beam for emission at an emission port of the polarized beam splitter prism. The system is suitable for a light source system of the laser heterodyne interferometer.

The invention discloses a biaxial MEMS reflective galvanometer and F-Theta lens-based linear scanning system used for a laser heterodyne interferometer, which relates to a scanning system using an optical lens and solves the problems that the conventional optical scanning system has single applicable wavelength and cannot realize linear and uniform-speed scanning. The linear scanning system comprises a laser, a polarization beam splitter prism, a 1 / 4 wave plate, a biaxial MEMS reflective galvanometer, a triplet F-Theta lens set, a high reflection mirror and a photoelectric detector, wherein the biaxial MEMS reflective galvanometer is positioned at the position of a system focal length of the triplet F-Theta lens set. The biaxial MEMS reflective galvanometer and F-Theta lens-based linear scanning system used for the laser heterodyne interferometer is suitable for the scanning system of the laser heterodyne interferometer.

The invention discloses a 2 mu m all-fiber coherent laser Doppler wind finding radar system, which consists of a 2 mu m off-axis Cassegrain optical antenna system, a 2 mu m laser beam splitting system, a 2 mu m seed implantation laser amplifier, a 2 mu m monitoring detector system, and a 2 mu m balanced heterodyne detection system. The system overcomes the defect of ambient interference existing in a free space optical path, overcomes the influence of shot noise on heterodyne reception signal-to-noise ratio, and solves the problems of all fiber and miniaturization of the 2 mu m all-fiber coherent laser Doppler wind finding radar system, so that the 2 mu m all-fiber coherent laser Doppler wind finding radar system has a more compact structure. In addition, the system has the characteristics of safe laser for human eye, optical path connection by adopting flexible optical fiber devices, high operability and stability, low cost, good real time, long effectively measured distance, high measurement accuracy (speed measurement and distance measurement) and the like, and has high practical value in the field of coherent laser Doppler wind finding radar.

The invention provides a Fabry-Perot cavity based non-modulating 2 mu m laser frequency stabilizing method and a device thereof. The device consists of a 2 mu m monolithic semi-nonplanar ring oscillator, an opto-isolator, a polarization splitting prism, a 1 / 2 wave plate, a reflector, a confocal Fabry-Perot-type cavity, a photoelectric detector, a P-I control circuit, a drive adapter, piezoelectric ceramics and an LD pumping source. Due to the fact that a confocal Fabry-Perot cavity has different transmissivities to two 2 mu m lasers in different frequencies, generates current difference after photoelectric conversion, fluctuation of laser frequency ensures the current difference can be amplified, and after the P-I control circuit amplifies the current difference signal, the P-I control circuit outputs a feedback control signal, controls the drive adapter and pressurizes a cavity lens of a laser, the device ensures that the laser frequency can regress to achieve the effect of frequency stabilization. The method and the device have application value in the fields of laser radar, laser measurement standard and the like.

The invention relates to a semiconductor diode array side-pumped 2-micrometer laser module which belongs to the technical field of laser. The module comprises a semiconductor diode array, a 2-micrometer laser crystal, a semiconductor diode array heat sink, a laser crystal heat sink and a heat sink reflecting surface, wherein pump light output by the semiconductor diode array enters the 2-micrometer laser crystal and is absorbed by the 2-micrometer laser crystal, and unabsorbed pump light is reflected by the surface of the laser crystal heat sink, reenters the 2-micrometer laser crystal and is absorbed again; a high-reflection film to the pump light is plated on the reflecting surface of the laser crystal heat sink; and when in use, the reflecting surface and the 2-micrometer laser crystal are tightly packed and contacted, which not only carries out conduction cooling on the 2-micrometer laser crystal, but also reflect the unabsorbed pump light to the 2-micrometer laser crystal, thereby improving the absorption to the pump light of the 2-micrometer laser crystal so as to obtain 2-micrometer laser output with higher power.

The invention discloses a thulium-doped microsphere cavity laser and a preparation method thereof, and belongs to the micro-optical device technical field. The thulium-doped microsphere cavity laser is composed of a thulium ion-doped microsphere coupling tapered optical fiber; an 808 nm laser is adopted as a pump light source; the tapered optical fiber is adopted to couple thulium-doped microspheres; and 2-micron laser can be outputted from the other end of the tapered optical fiber. A sol-gel method is adopted to prepare a thulium ion-containing solution; a carbon dioxide laser is adopted toheat the tail end of a communication optical fiber coated with the solution, and therefore, a thulium ion-doped carbon dioxide microsphere can be prepared; a heating and stretching method is adopted to obtain a tapered optical fiber by means of a ceramic heater, the diameter of the tapered region of the tapered optical fiber ranges from 1 micron to 5 microns; the microsphere is coupled to the tapered optical fiber under the control of a three-dimensional platform, so that a microsphere laser which is capable of stably outputting 2-micron band laser, with an 808 nm laser adopted as a pump source, a microsphere adopted a resonant cavity, and thulium ions adopted as a working substance, can be obtained. Since the commercially available 808 nm laser is adopted as the pump light source, the practical value of the thulium-doped microsphere cavity laser of the invention can be greatly improved. The thulium-doped microsphere cavity laser has the advantages of simple fabrication, low threshold,miniaturization and stable output.

The invention discloses a two-micron wave band impulse fiber laser based on a super-continuum spectrum light source, aiming to provide a two-micron wave band impulse fiber laser which easily realizes ps-ns order impulse width laser and is based on the super-continuum spectrum light source. The laser disclosed by the invention consists of the super-continuum spectrum light source, a wavelength division multiplexer, a high-reflectivity fiber bragg grating, a low-reflectivity fiber bragg grating, a gain fiber and a fiber isolator. The super-continuum spectrum light source is selected as a pumping source; super-continuum spectrum light entering the gain fiber contains both pumping light and signal light which are required by the laser and through the wavelength division multiplexer; and as an initial seed laser, the signal light contained by the super-continuum spectrum is reflected and amplified in a resonant cavity, and laser output is obtained finally. According to the invention, the width of the impulse of the two-micron laser depends on pumping super-continuum spectrum light source and is not limited by the cavity length of the laser, the two-micron impulse laser with high repetition frequency can be obtained, and the structure of a system is simple and easy to realize.

The invention relates to a 2mum coherent wind lidar polarization state matching and correcting system, which comprises a 2mum laser, a first single-mode polarization-maintaining fiber, an acoustooptic frequency shifter, a second single-mode polarization-maintaining fiber, a tail fiber-type Grin lens, a lambda / 2 wave plate, a lens, a polarization beam splitter prism, a lambda / 4 wave plate, an off-axis optical antenna, a stepper motor drive device, a polarizer, a first tail fiber-type coupling lends, a double-channel polarization state analyzer system, a second fiber beam splitter, a photodiode, a coaxial cable, and an oscilloscope. The system can monitor each polarization state situation of reference local oscillation laser signals and laser echo signals in the coherent wind lidar system in real time. when polarization state of two light beams are not matched, the double-channel polarization state analyzer system can automatically correct the polarization state of the laser until matching is realized, thereby greatly improving the heterodyne efficiency of the coherent wind lidar system and improvising detection sensitivity of the system.

The invention provides germanate-tellurite glass for double-clad fiber and a preparation method of the fiber. The germanate-tellurite glass for the double-clad fiber comprises thulium doped fiber core glass, inner clad glass and outer clad glass. An optical fiber preform provided with a hexagonal inner clad is prepared with a stacking method, the fiber which is the double-clad fiber provided with the hexagonal inner clad is formed by wire drawing once in a wire drawing tower. The fiber integrates advantages of germanate glass and tellurite glass; the glass contains Al2O3, has better thermal properties and more excellent spectral properties; and by means of the thulium doped fiber core, minus 2 mu m laser output can be achieved.

The invention discloses a thulium-doped fiber laser-based method and a thulium-doped fiber laser-based device for generating quadruplicated frequency blue laser; the method and the device utilize the characteristics that a thulium-doped fiber laser is high in output power and good in light beam quality; and the 450-500nm blue laser with higher power can be obtained by carrying out frequency multiplication on 1.8-2mu. m laser output by the thulium-doped fiber laser for twice. By adopting the structural form of combining the fiber laser and a crystal optical element, the device is simple in structure and convenient to use, can guarantee better light beam quality while outputting high power, and realizes integration and modularization of a system.

The invention is concerned with the laser that uses the doping crystal and non-doping crystal diffused bonding or combinative place to form non-plane ring cavity creating 2 mum single longitudinal module laser output. The laser medium of the laser is the single non-plane ring crystal that can create 2 mum laser output the doping crystal (such as Tm:YAG, Tm:LuAG, Tm,Ho:YAG, Ho:YAG crystal etc.) and the non-doping crystal (such as non-doping YAG crystal) diffused bonding or combinative place to form single non-plane ring crystal, uses the semiconductor laser as the pump source that the absorb wavelength of the central wavelength and the doping crystal is accordant, can create the 2 mum single longitudinal module laser output. The characteristic of the invention is: uses the diffused bonding or combinative place to form compound crystal as the working material, uses the single non-plane ring cavity as the laser resonance cavity, and creates 2 mum single longitudinal module laser output.

The invention relates to a Tm3+ doping-based fluoride glass microsphere laser, which belongs to the field of solid lasers and mainly comprises a micro-nano optical fiber, a fluoride glass microsphereof the ZYA doped with Tm3+, a pump source and a spectrometer. The pump source, the micro-nano optical fiber, the fluoride glass microsphere of the ZYA doped with Tm3+ and the spectrometer are coupledby a single-mode optical fiber in sequence. The method adopts a CO2 laser micromachining mode to prepare the fluoride glass microsphere of the ZYA doped with Tm3+, and realizes the 2-micron laser output of the fluoride glass microsphere of the ZYA doped with Tm3+. The laser in the invention has the characteristics of low threshold value and high Q value; and the structure is simple, the miniaturization and integration of the laser can be realized under a low threshold value, and a new matrix material is provided for the laser technology. The 2-micron laser obtained by the invention can be applied to the fields of integrated photonics, low-threshold laser, high-sensitivity biosensing, cavity photodynamics and the like.

The invention discloses a narrow-linewidth 2-micron laser device. The narrow-linewidth 2-micron laser device includes a 1.9-micron laser pumping source, an optical coupling system, a holmium ion doped laser crystal, a Q switch, a first cavity mirror, a second cavity mirror, a third cavity mirror and a feedback mirror; 1.9-micron-wavelength laser outputted by the 1.9-micron laser pumping source is shaped through the optical coupling system and then is used for the holmium ion doped laser crystal; and the holmium ion doped laser crystal, the first cavity mirror, the second cavity mirror, the third cavity mirror and the feedback mirror jointly form an active laser resonant cavity. With the narrow-linewidth 2-micron laser device adopted, a special etalon or grating is not needed to be used for narrowing linewidth, and therefore, intracavity loss of the laser can be reduced, and the stability of the laser can be improved. The narrow-linewidth 2-micron laser device of the invention can realize high-power, high-beam quality and narrow-linewidth 2-micron laser output, and has the advantages of simple and compact structure and high stability, and has a bright application prospect in the fields of military, spectroscopy, remote sensing etc..

The invention discloses a 2-micron high-doped thulium fluo phosphate glass fiber and a preparation method thereof. A fiber core is fluo phosphate glass; core glass and inner coating glass are prepared by using a fusion method; an optical fiber perform is prepared by using a suction pouring method; and finally the glass fiber is manufactured by drawing. The fiber manufactured by drawing has high optical uniformity and excellent physicochemical properties. Moreover, when the Tm ion is doped to achieve 6mol percent, a concentration quenching phenomenon dose not appear still. The invention has the advantages that: (1) the fluo phosphate glass fiber of the invention has good fiber mechanical strength and high chemical stability; (2) the fluo phosphate glass fiber obtained by the high-concentration doping of the Tm ion can obtain effective 2-micron laser output; and (3) the fluo phosphate glass fiber of the invention has simpler preparing technique, lower production cost, and excellent practical prospect.

The invention provides an all-fiber gas raman laser device used for generating two-micrometer continuous lasers. According to the laser device, the tunable two-micrometer continuous lasers can be output through the stimulated raman scattering effect to which one-micrometer wave-band continuous pump light and H<2> gas which is arranged in hollow photonic crystal fibers in a filling mode are subjected.

CdSiP2 crystals with sizes and optical quality suitable for use as nonlinear optical devices are disclosed, as well as NLO devices based thereupon. A method of growing the crystals by directional solidification from a stoichiometric melt is also disclosed. The disclosed NLO crystals have a higher nonlinear coefficient than prior art crystals that can be pumped by solid state lasers, and are particularly useful for frequency shifting 1.06 μm, 1.55 μm, and 2 μm lasers to wavelengths between 2 μm and 10 μm. Due to the high thermal conductivity and low losses of the claimed CdSiP2 crystals, average output power can exceed 10 W without severe thermal lensing. A 6.45 μm laser source for use as a medical laser scalpel is also disclosed, in which a CdSiP2 crystal is configured for non-critical phase matching, pumped by a 1064 nm Nd:YAG laser, and temperature-tuned to produce output at 6.45 μm.

The invention discloses a 2-micron laser device enabling linearly polarized output. The 2-micron laser device includes a 1.9-micron laser pumping source, an optical coupling system, a Ho:YAG laser crystal, a YAG crystal, an acousto-optic Q switch, a first cavity mirror, a second cavity mirror and a third cavity mirror; pump light generated by the 1.9-micron laser pumping source passes through the optical coupling system and then is injected into the Ho:YAG laser cryastal; one end of the Ho:YAG laser crystal has a cross section in the shape of a trapezoid; an included angle between the waist and the upper bottom edge of the trapezoid is a specific angle alpha, and therefore, when being refracted, laser of which the transmission direction is perpendicular to the other end surface of the Ho:YAG laser crystal satisfies Brewster conditions; and the Ho:YAG laser crystal, the first cavity mirror, the second cavity mirror and the third cavity mirror jointly form a 2-micron laser resonant cavity. The 2-micron laser device of the invention can realize high-beam quality, high-power and linearly polarized laser output, and has the advantages of simple structure and convenient adjustment.

The invention provides a tunable single longitudinal mode 2[mu]m solid laser based on a bipyramid resonant cavity, belonging to the optical field. The invention aims to solve the problem that a single longitudinal mode 2[mu]m solid laser in the prior art is bad in stability and interference resistance capability, and is easy to be influenced by vibration, changeable temperature, disturbed air flow or other environmental conditions, and the light beam quality of the laser is deteriorated and the output power is decreased. Pump light is emitted into an Ho:YAG crystal through a pump light injection mirror to generate left and right propagation oscillation light; the right propagation oscillation light passes through a polaroid, a first pyramid prism, a double F-P etalon, a second pyramid prism, a quarter wave plate, the pump light injection mirror, the Ho:YAG crystal, and a polaroid; and s light is output by the polaroid; the left propagation oscillation light passes through the quarter wave plate, the second pyramid prism, the double F-P etalon, the first pyramid prism, and the polaroid, and s light is output by the Polaroid; and the bidirectional output of the 2[mu]m laser light is realized on the polaroids. The tunable single longitudinal mode 2[mu]m solid laser is applied to laser technology.

A 2-micrometer laser device capable of forming a half-intracavity optical parametric oscillator on the basis of a volume grating sequentially comprises a first plane mirror, a laser crystal, an acousto-optic Q-switch, a second plane mirror, a nonlinear crystal, a third plane mirror and the volume grating; the first plane mirror, the laser crystal, the acousto-optic Q-switch and the third plane mirror form a 1-micrometer laser device; the second plane mirror, the nonlinear crystal and the volume grating form an optical parametric oscillator; a large beam radius side is arranged on a main nodal plane of the laser crystal; the first plane mirror is high in reflectivity to 1-micrometer laser; the second plane mirror is high in reflectivity to 2-micrometer laser and high in transmission to the 1-micrometer laser; the third plane mirror is high in reflectivity to the 1-micrometer laser and high in transmittance to the 2-micrometer laser; the nonlinear crystal is arranged at the position corresponding to the maximum confocal parameter of 1-micrometer laser beams; and the 2-micrometer laser can be partially transmitted through the volume grating and can be partially reflected by the volume grating. The 2-micrometer laser device has the advantages that the 2-micrometer laser with high beam quality and power and narrow line width can be outputted by the 2-micrometer laser device, and the 2-micrometer laser device is simple in structure and low in cost.

The invention discloses a micro-electro-mechanical-system (MEMS) scanning 2mum laser heterodyne interferometer optics system and an adjustment method thereof. The system comprises a 2mum fiber optic laser, a fiber optic beam splitter, a Green lens, a first lens, a second lens, a polarization beam-splitter prism, a lambda / 4 wave plate, an MEMS array lens, an F-Theta lens, a reflector, a fiber optic receiving collimator, a fiber optic beam combiner, an online polarizer, a photoelectric detector, an oscilloscope, an acousto-optic frequency shifter and an attenuator. During a debugging process, by adjusting the polarization beam-splitter prism, the first lens, the second lens and the MEMS array lens, positions and postures of all devices are determined, and finally, a time-domain curve and a frequency-domain curve displayed by the oscilloscope respectively correspond to external drive signal frequencies of the acousto-optic frequency shifter. According to the MEMS scanning 2mum laser heterodyne interferometer optics system and the adjustment method thereof disclosed by the invention, the problem that the laser test signal coupling efficiency is low under different modes of the large-diameter MEMS scanning laser heterodyne interferometer system is solved, and the system stability and the detection sensitivity of the heterodyne interferometer system are improved.

The invention relates to a cascade 2-mu m solid laser of double-wavelength mixed pumping, which belongs to the technical field of laser. Pumping light output by a double-wavelength mixed pumping source is focused on 2-mu m laser crystals, the 2-mu m laser crystals absorb the pumping light with different wavelengths lambda 1 and lambda 2 and obtain gains, the two 2-mu m laser crystals are cascaded to realize laser oscillation in a laser resonator comprising a laser totally reflecting mirror, a laser reflecting mirror of 45 degrees and a laser output mirror, and 2-mu m laser is output from the laser output mirror. The invention has the advantages that the absorption of the 2-mu m laser crystals to the pumping light can be increased, the thermal lens effect of the 2-mu m laser crystals is decreased, and the quality of the light beam of the 2-mu m output light is improved, thereby obtaining the output of the 2-mu m laser with high power and high efficiency.

The invention discloses a Tm-doped lanthanum vanadate-doped TmzLa1-zVO4 luminescent material (z is more than or equal to 0.0001 and less than or equal to 0.1) and a melting crystal growth method thereof. The melting crystal growth method comprises the following steps of: carrying out sufficient mixing, press forming and high-temperature sintering on raw materials prepared in proportion to obtain an initial raw material of crystal growth; placing the initial growth raw material into a crucible, and sufficiently melting through heating to obtain an initial molten mass of melting growth; and then growing by adopting melting methods, such as a czochralski method, a bridgman-stockbarger method, a temperature-gradient method and other melting methods. The TmzLa1-zVO4 can be used as a luminescent display material, a laser operating substance of 2 micrometers, and the like.

The invention relates to a 3.5-micron extreme-narrow linewidth laser output method. 1.9-micron pumping light transmitted by a first pumping laser device (9) and a second pumping laser device (10) enters an isolation device, the pumping light transmitted through the isolation device enters a uni-doped Tm: YVO4 crystal (2) and is absorbed by the uni-doped Tm: YVO4 crystal (2), then 3.5-micron laseris produced, 2-micron obtained through total reflection conducted on the 3.5-micron laser by a second total reflection mirror (3) enters a graphene Bragg grating (4), and first compressed light is obtained through beam linewidth compression of the graphene Bragg grating (4). The first compressed light enters a quartz dispersing prism (5) performs second time of linewidth compression, compressed beams are output from an output coupling lens (6), a computer system (12) automatically adjusts parameters of the pumping lasers, optical grating and a prism till the performance of the output light ismatched with pre-stored simulation information, and accordingly laser output of picometer linewidth is obtained.

The invention discloses a Cr, Tm, Ho-doped lanthanum vanadate CrxTmyHozLa1-x-y-zVO4 luminescent material (x is more than or equal to 0.0001 and less than or equal to 0.1, y is more than or equal to 0.0001 and less than or equal to 0.1, z is more than or equal to 0.0001 and less than or equal to 0.1) and a melting crystal growth method thereof. The melting crystal growth method comprises the following steps of: carrying out sufficient mixing, press forming and high-temperature sintering on raw materials prepared in proportion to obtain an initial raw material of crystal growth; placing the initial growth raw material into a crucible, and sufficiently melting through heating to obtain an initial molten mass of melting growth; and then growing by adopting melting methods, such as a czochralski method, a bridgman-stockbarger method, a temperature-gradient method and other melting methods. The CrxTmyHozLa1-x-y-zVO4 can be used as a luminescent display material, a laser operating substance of 2 micrometers, and the like.

The invention discloses a Ho-doped lanthanum vanadate HozLa1-zVO4 luminescent material (z is more than or equal to 0.0001 and less than or equal to 0.1) and a melting crystal growth method thereof. The melting crystal growth method comprises the following steps of: carrying out sufficient mixing, press forming and high-temperature sintering on raw materials prepared in proportion to obtain an initial raw material of crystal growth; placing the initial growth raw material into a crucible, and sufficiently melting through heating to obtain an initial molten mass of melting growth; and then growing by adopting melting methods, such as a czochralski method, a bridgman-stockbarger method, a temperature-gradient method and other melting methods. The HozLa1-zVO4 can be used as a luminescent display material, a laser operating substance of 2 micrometers, and the like.

The invention discloses a Ho-doped scandium vanadate (Ho<z>Sc<1-z>VO4) luminous material (z is less than or equal to 0.1 and is more than or equal to 0.0001). Raw materials prepared according to a ratio are fully mixed, compacted and shaped, and sintered in a high temperature, and then a starting material for crystal growth is prepared. The starting material for crystal growth is added into a crucible and heated to be fully melted, and then initial melt for melt method crystal growth is prepared. Then crystal growth is carried out by using a melt method such as a Czochralski method, a Bridgman-Stockbarge method, a temperature gradient technique method, and other melt methods. The Ho<z>Sc<1-z>VO4 provided by the invention can be used as luminous and displaying materials, 2-micron laser materials, and the like.