106results about How to "Achieve laser output" patented technology

The invention provides a double-resonance, wide-tuning and narrow-linewidth all-solid-state nanosecond pulse medium-infrared optical parameter oscillator comprising four parts including single-frequency pump light, a double-resonance resonant cavity, an electrical control part and seed light. A 1.064 <mu>m single-frequency pulse laser pump quasi-phase matching multi-cycle polarized crystal double-resonance parameter oscillator is adopted to acquire dual-band laser output of wide-tuning range near-infrared signal light and medium-infrared idle light. The output central wavelength is tunable within the wide spectral range, and the cavity length is dynamically adjusted through electro-optical crystal by combining a single-frequency continuous semiconductor laser seed injection technology so as to realize narrow-linewidth laser output of the optical parameter oscillator. The oscillator can be widely applied to the field of high-resolution laser spectroscopy, laser radar, laser remote sensing, environmental detection, optical-electro countermeasure and laser medicine.

The invention relates to a graphene optical Q-switch and an application. The graphene optical Q-switch comprises a SiC substrate and a grapheme material growing on the SiC substrate. One surface carrying the grapheme faces the inner side of the laser cavity while the other surface faces the outer side of the laser cavity. The graphene optical Q-switch is used in the laser, pump light passes through the graphene optical Q-switch after passing through the laser gain medium and the SiC substrate is used as an output mirror and forms a resonant cavity with the front cavity mirror in front of the laser gain medium. The invention can adjust loss of laser generated by visible light, infrared or ultraviolet light. The Q-switch has the advantages of simple preparation, low cost, achievable adjustment of laser with large wavelength range and is beneficial to industrialized production and the like.

The invention relates to a light polarization compensation device for utilizing a beam shaping technology and a space beam combination system to convert incident laser into polarized laser to be output and belongs to the technical field of light polarization compensation. The device mainly comprises an input optical interface, a polarization beam splitter, a shaper, a first reflecting mirror, a spiral wave device, a second reflecting mirror and a space beam combiner. Against the polarization compensation problem of a laser, the light polarization compensation device aims to solve the problem of polarization instability and low extinction ratio of the laser, the lossless polarization compensation device based on the high-duty-cycle space beam combination system and the beam shaping technology is provided, and random laser is converted into high-extinction-ratio polarization laser to be output on the condition that the laser power level and beam quality are not affected. The light polarization compensation device is very small in power loss, the structure of the laser is not affected, and the cost and the complexity of the linear polarization laser can be effectively reduced; a control method for the light polarization compensation device is simple, a feedback and control system does not need to be arranged, and the light polarization compensation device is stable and reliable in performance.

The invention relates to a fiber optical parametric oscillator for achieving Fourier domain mode-locked laser output. Seed light output by two semiconductor lasers is modulated by phase and amplified by a high power optical amplifier to serve as pump light, the pump light is output from the pump output end of a wavelength division multiplexer and enters high nonlinear fiber through a polarization controller, and a part of the pump light is transferred into signal light in the high nonlinear fiber due to fiber nonlinear effect. After the signal light passes through a second optical isolator, dispersion-shifted fiber and a tunable filter, most energy is fed back to the high nonlinear fiber from a high power shunt ratio output end of an optical coupler with 9:1 power shunt ratio through the wavelength division multiplexer so as to form resonance laser output. When modulation frequency of the tunable filter is equal to fundamental frequency of a laser resonant cavity, the Fourier domain mode-locked laser output can be obtained. The fiber optical parametric oscillator achieves the Fourier domain mode-locked laser output, has significant application value in the fields of optical tomography, fiber bragg grating sensing and the like, and has the advantages of being high in wavelength scanning frequency, flexible in laser output spectrum tuning range control and the like.

An ultra narrow linewidth tunable microwave signal source belongs to the field of photoelectron and microwave photonics and aims to solve problems of wide linewidth, high noise, complex system and high cost of a microwave signal source. The ultra narrow linewidth tunable microwave signal source is characterized in that pump light is output from an adjustable narrow linewidth Brillouin pump laser; the pump light is amplified by an Er-doped optical fiber amplifier; after passing a first three-port coupler, most pump light enters a four-port coupler by a polarization controller and a circulator; small part of the pump light achieves a second three-port coupler by a variable optical attenuator; one part, entering the four-port coupler, of the pump light enters a high non-linear optical fiber to excite first-order stokes light in the opposite direction while the other part is output from the port subjected to oblique angle processing; the odd number-order stokes light achieves the second three-port coupler by the circulator and an optical fiber bragg grating; the obtained dual-wavelength laser achieves a photoelectric detector by the second three-port coupler to carry out beat frequency to obtain a narrow linewidth high-frequency microwave signal and the signal is measured by an electric spectrometer.

The invention discloses a glass ceramics whispering gallery mode resonant cavity capable of outputting single mode high-performance laser and a preparation method thereof, and belongs to the field ofoptical devices. The method comprises the following steps: firstly mixing raw materials for preparing the glass resonant cavity with rear earth active ion raw materials sufficiently, then carrying outmelting and rod winding to obtain active fiberglass; drawing the active fiberglass to tapered fiber by melt extraction, and truncating the tapered fiber in the middle to obtain single taper fibers; melting the thin ends of the single taper fibers through a heating source, and forming a microsphere cavity by utilizing the action of surface tension; carrying out heat treatment or laser-induced treatment on the microsphere cavity to obtain a glass ceramics microsphere cavity, and carrying out coupling with the tapered fiber and packaging to obtain the glass ceramics whispering gallery mode resonant cavity. According to the invention, the preparation process is simple, the prepared glass ceramics microsphere cavity has relatively high quality factor, the influence on active ion gain propertyof amorphous state and relatively high phonon energy of glass is improved by the separation of microcrystal, and laser output with lower threshold value and higher slope efficiency can be realized.

The invention provides an intermediate infrared multi-band all-fiber soft glass laser and a method for obtaining intermediate infrared multi-band fiber laser through the laser. The laser comprises a laser pumping source, laser pumping source tail fibers, a first fiber fusing point, a first fiber bragg grating, a second fiber bragg grating, first rare earth ion doped fibers, a third fiber bragg grating, a fourth fiber bragg grating, a second fiber fusing point, a fifth fiber bragg grating, a sixth fiber bragg grating, a seventh fiber bragg grating, an eighth fiber bragg grating, second rare earth ion doped fibers, an ninth fiber bragg grating, a tenth fiber bragg grating, an eleventh fiber bragg grating and a twelfth fiber bragg grating which are connected in sequence. According to the laser, a dual-band cascaded Ho<3+>-doped fluoride fiber laser pumped by a semiconductor laser is used as the pumping source; Pr<3+> and Tb<3+> co-doped sulfide fiber with annular composite core structures are used as gain medium; and a sulfide fiber bragg grating array is used as resonant cavity feedback and output coupling, so that simultaneous output of four-waveband fiber laser of 3.7[mu]m, 4.89[mu]m, 5.1[mu]m and 7.5[mu]m under the all-fiber structure can be realized.

A sandwich rare earth ion doped yttrium aluminum garnet laser material with a sandwich ceramic and single-crystal composite structure is prepared from YAG and RE: YAG and is of the structure that the YAG is located on two sides and the RE: YAG is located in the middle, wherein the molecular formula of the YAG is Y3Al5O12, the molecular formula of the RE: YAG is REx: Y3-xAl5O12, the x is greater than or equal to 0.003 but is smaller than or equal to 0.3, and the RE is Yb3+, Nd3+ or Ho3+. By the adoption of a single-crystal ceramic composite process, the ceramic of the portion combined with a single crystal is integrated with an initial single crystal to obtain the YAG ceramic coated RE: YAG single crystal or YAG single crystal caoted RE: YAG ceramic sandwich composite structure, the thermal performance of a gain medium is improved, the laser pumping intensity is improved, greater energy laser output is achieved, and meanwhile good gain output and light beam quality are obtained.

The invention discloses a single-frequency fiber laser device with a wide single-longitudinal-mode temperature range. The laser device is composed of a broadband fiber grating, a highly-doped gain fiber, a narrowband fiber grating, a wavelength division multiplexer, a single-mode semiconductor pump laser device and an optical isolator. The single-mode semiconductor pump laser device is used as a pump source to carry out pumping on a resonant cavity; with the fiber grating with the short grating zone length, the reflectivity of the narrowband fiber grating is optimized and improved; and with the ultra-short highly-doped gain fiber as a grain medium, the effective cavity length of the whole resonant cavity is shortened effectively from many aspects and the space between adjacent longitudinalmodes inside the cavity is increased substantially, so that the laser device is able to realize a stable single-frequency laser output within a wide temperature range. The laser device has the wide single-longitudinal-mode temperature range and is protected from being affected by the external environmental temperature in operation; and the stable single longitudinal mode output is realized. The laser device can be applied to fields of space detection, coherent optical communication, Doppler wind-finding radar, gravitational wave detection, and quantum optics and the like.

The invention discloses a winding device for an active optical fiber and a fiber winding method. The winding device for the active optical fiber comprises a heat dissipation disk, wherein the heat dissipation disk adopts a track structure, the inner wall of the heat dissipation disk is an inclined surface, a groove for winding the active optical fiber is formed in the inclined surface, and the adjacent groove parts are spaced by a certain interval. With the adoption of the winding device and the fiber winding method, heat of the active optical fiber can be better dissipated, besides, the optical fiber extends naturally in the winding process so as to avoid pressure stress caused by fixation by the aid of external force, meanwhile, the difference of inner and outer winding diameters of the optical fiber is small, high-order mode lasers are effectively filtered out, and near-fundamental-mode laser output with the high laser beam quality is obtained.

The invention provides a double-ended output linear cavity all-fiber laser oscillator comprising a gain fiber, a backward output fiber grating, a forward output fiber grating, a fiber coupled semiconductor laser, a pump signal combiner, a signal energy transmission fiber, a pump energy transmission fiber, a forward cladding optical filter, a forward output fiber end cap, a backward cladding optical filter and a backward output fiber end cap. The backward output fiber grating, the gain fiber and the forward output fiber grating are connected in turn to form a fiber laser resonant cavity throughthe signal energy transmission fiber. The fiber coupled semiconductor laser outputs pump light to be injected into the pump signal beam combiner through the pump energy transmission fiber and then injected into the fiber laser resonant cavity through the signal energy transmission fiber. The reflectivity of forward and backward fiber gratings is not greater than 95% so that the laser generated bythe resonant cavity can be outputted from both ends of the resonant cavity. The laser outputted from both ends of the fiber laser resonant cavity passes through the forward and backward cladding optical filters and then is outputted by the connected fiber end cap after beam expansion.

The invention discloses an all-fiber 980nm high-power optical fiber oscillator in order to solve the problem that the existing 980nm optical fiber oscillator is of low electro-optical efficiency and is restricted in pump light coupling. The all-fiber 980nm high-power optical fiber oscillator is composed of a gain module, two pump modules, two optical fiber mode field adapters, two photosensitive optical fibers, two optical fiber gratings, and an output coupling end. The gain module is composed of a pump coupling module and a double-cladding ytterbium-doped optical fiber. The pump coupling module uses two lateral pump combiners or K multi-mode optical fibers. The two pump modules contain multiple pump sub-modules. Each pump sub-module is a semiconductor laser of which the tail fiber outputs laser of 900-960nm or a beam combiner structure. Each of the two optical fiber mode field adapters can be either an optical fiber mode field adapter or a series structure of sub optical fiber mode field adapters. The center wavelength of the optical fiber gratings inscribed in the photosensitive optical fibers is in the laser band. The problem that the existing 980nm optical fiber oscillator is of low electro-optical efficiency and is restricted in pump light coupling is solved.

The invention discloses a transition metal ion concentration gradient doped zinc sulfide/ zinc selenide and a preparation method thereof. The active ion of the laser material is one or more of transition metal ions Tm<2+>, Cr<2+>, Co<2+> and Fe<2+>, and the doping concentration of the transition metal ions on two end surfaces of the laser material is in exponential distribution from high to low and is 10<16>-10<20> ions/cm<3>. The material has the characteristics of wide absorption and emission bandwidth and large absorption and emission section, and can obtain ultra-short and ultra-fast laser output with high peak power. One end of the laser material with large doping concentration is attached to a heat sink, so that heat energy generated when incident light enters the laser gain material can be quickly taken away, thus the heat effect produced by laser is reduced, and efficient laser output is achieved.

The invention discloses an intermediate infrared laser device with an tunable inner cavity OPO. The intermediate infrared laser device comprises an LD semiconductor pumping source, an optical fiber coupling system, a laser gain crystal, an air-cooling radiator, a crystal temperature control furnace, a film-coated endoscope and a periodically poled crystal. The film-coated endoscope comprises a front-cavity mirror plane mirror M1, an intracavity focusing lens, an OPO front-cavity mirror plane mirror M2 and a rear-cavity mirror M3. A light source generated by the LD semiconductor pumping source passes through the optical fiber coupling system and is output. The front-cavity mirror plane mirror M1, the laser gain crystal, the intracavity focusing lens, the OPO front-cavity mirror plane mirror M2, the periodically poled crystal and the rear-cavity mirror M3 are sequentially arranged in the output direction of the coupling light source of the optical fiber coupling system in parallel. The laser gain crystal is arranged on the air-cooling radiator. The periodically poled crystal is arranged on the crystal temperature control furnace. The intermediate infrared laser device is simple and compact in structure, low in energy consumption and capable of being miniaturized and fully solidified easily, and can be mounted onboard or on vehicles.

The invention relates to an optical fiber of coupling a multilayer rare earth blending ring-shaped fiber core with a single-mold fiber core, belonging to high-power optical fiber amplifiers, lasers and special fibers; a rare earth blending ion core area (1) is arranged at the center of the optical fiber, a first silicon ring core (21), a first rare earth blending ion ring core (41), ...(N+1)th silicon ring core (2, N+1), and a coating layer (3) are sequentially arranged from inwards to outwards, wherein, N is more than or equal to 2 and is less than or equal to 50; the refractive indexes of the rare earth blending ion core area, the first rare earth blending ion ring core, ...and the Nth rare earth blending ion ring core (4N) are equal, the refractive indexes of the first silicon ring core, ...and the (N+1)th silicon ring core are equal, the refractive indexes of the first silicon ring core (21), ...and the (N+1)th silicon ring core are lower than the refractive indexes of the rare earth blending ion core area, the first rare earth blending ion ring core, ...and the Nth rare earth blending ion ring core; the refractive index of the coating layer is lower than the refractive indexes of the first silicon ring core, ...and the (N+1)th silicon ring core (2, N+1), the manufacturing difficulty of the optical fiber is reduced, and large and effective mold area of the optical fiber is realized.

The invention discloses an out-of-focus compensated high-power narrow linewidth and linear polarization optical fiber laser generating system. The out-of-focus compensated high-power narrow linewidthand linear polarization optical fiber laser generating system comprises a narrow linewidth and linear polarization optical fiber seed source, a polarization control module, a non-polarization-maintaining cascading optical fiber amplifier, an out-of-focus compensated beam-expanding collimating system, an integrated polarization and optical signal extracting module and an active polarization controlsystem. Laser output from the narrow linewidth and linear polarization optical fiber seed source is injected to the non-polarization-maintaining cascading optical fiber amplifier through the polarization control module, and the amplified laser is injected to the integrated polarization and optical signal extracting module through the out-of-focus compensated beam-expanding collimating system. Anextracted optical signal is converted to an electrical signal by the integrated polarization and optical signal extracting module, and the electrical signal is injected to the active polarization control system. The electrical signal is processed by the active polarization control system, and a control signal is applied to the polarization control module, so the closed-loop control of the whole system is realized. The system is capable of simultaneously realizing the high-power narrow linewidth, linear polarization, and low-aberration optical fiber laser output.

The invention relates to a multi-wavelength intermediate infrared optical parametric oscillator implemented by difference frequency in a multi-seed injection cavity, and belongs to the technical field of multi-length laser. A plurality of seed light with different wavelengths are injected into a stable optical fiber laser pumping optical parametric oscillator, stable strong signal light exists in an optical parametric oscillator cavity already, the injected multi-wavelength seed light cannot generate difference frequency with the signal light, thus, a plurality of intermediate infrared laser outputs with different wavelengths are generated; a complicated wavelength selection device or a specially-polarized crystal is not needed to introduce or customize, the signal light only exists in the cavity, difference frequency is performed between a multi-seed light source and the signal light to generate the multi-wavelength outputs, and the multi-wavelength intermediate infrared optical parametric oscillator is simple in structure and stable and reliable in performance, and is easy to implement; and parameters such as line width, wavelength, intensity and envelope of the seed light used in the invention are relatively independent, the multi-wavelength intermediate infrared optical parametric oscillator is high in expansibility, many laser outputs in different types can be achieved, and a plurality of laser wavelength generated are stable and controllable in number, intensity and frequency interval.

A large-mode-area single-mode multi-core segmented cladding fiber belongs to high-power fiber optic amplifiers, laser devices and special optical fibers. The large-mode-area single-mode multi-core segmented cladding fiber overcomes the defect that existing large-mode-area single-mode fibers are low in production yield and limited in segmented mode area. According to the large-mode-area single-mode multi-core segmented cladding fiber, a rare earth doped ion core area (1) is formed in the center; from the inside to the outside, a first silicon ring core (2, 1), a first rare earth doped ion ring core (3, 1)... an Nth silicon ring core (2, N) and an Nth rare earth doped ion ring core (3, N), M segmented cores (4, 1)... (4, M) uniformly distributed around the Nth ion ring core and provided with the same radius and the same radian, an internal cladding layer (5) and an external cladding layer (6) are distributed. The ion core area, the ion ring cores and the segmented cores are identical in refractive index and are n1; the silicon ring cores are identical in refractive index and are n2, and n2<n1. A segmented fiber core is processed into the M segmented fiber cores with the same radius and the same radian through an optical fiber preform, so that the large-mode-area single-mode multi-core segmented cladding fiber save materials and is easy to manufacture, simple and effective in manufacturing method and applicable to large-scale production.

The invention discloses a high-power pulse width tunable semiconductor laser light source module, which utilizes optoelectronic integrated packaging technology to integrate laser drive control and a laser for package, performs fiber output on semiconductor laser coupling through a polarization combining technique and a self-focusing lens fiber coupling technology to achieve high peak power, smallvolume and narrow pulse, and uses an external trigger signal to realize pulse width tunable function. Compared with fiber lasers and solid lasers, the high-power pulse width tunable semiconductor laser light source module has obvious advantages in performance, cost and photoelectric conversion efficiency.

The invention discloses a multilayer YAG-Tm:YAG-YAG-Ho:YAG-YAG composite laser ceramic as well as a preparation method and application thereof. The composite ceramic is prepared by the following steps: by taking commercial raw material powder aluminum oxide (Al2O3), yttrium oxide (Y2O3), thulium oxide (Tm2O3) and holmium oxide (Ho2O3) as raw materials, by adopting tetraethoxysilane (TEOS) as a sintering aid, adding a certain amount of organic additives, performing ball-milling for a certain time under a planetary ball mill, thereby obtaining the needed slurry; performing processes such as defoaming, tape casting, laminating and compounding and isostatic compaction on the slurry, fully degreasing the green body under oxygen or air conditions, and finally performing high-temperature vacuum sintering and annealing treatment. The method is simple in process and high in production efficiency and can be widely applied to the fields of electronics, materials and energy, preparation of large-area ultrathin ceramic materials can be realized, and textured preparation of the ceramics can be realized.

The invention proposes a silicon-based laser device, which relates to the technical field of optical communication. The silicon-based laser device comprises a silicon substrate and a semiconductor light emitting chip, wherein an annular closed silicon waveguide, a connection silicon waveguide, an annular open silicon waveguide and an output silicon waveguide are formed on the surface of the silicon substrate; light emitted from the semiconductor light emitting chip enters the annular closed silicon waveguide and the annular open silicon waveguide via the connection silicon waveguide for resonance; light reflection occurs at a junction of the annular open silicon waveguide and the output silicon waveguide, so that part of the light is reflected back to the connection silicon waveguide for resonance, and the other part of the light is reflected toward the output silicon waveguide to be output externally. The silicon-based laser device provided by the invention can be used for resonatingand reflecting the light provided by the semiconductor light emitting chip so as to finally realize laser output, thereby improving the silicon light emitting efficiency.

The invention discloses an array fiber laser device which comprises a multi-core fiber. The multi-core fiber is a capillary tube, and multiple gain fibers and coreless fibers laid in the radial direction of the capillary tube are fixed to the inside of the multi-core fiber; two end surface and side surfaces of the capillary tube are plated with high-reflective films for pump light; film layers with high reflectivity for the pump light or photoetching gratings are applied to end surfaces of the gain fibers; the refractive index of the coreless fibers is not larger than that of an adjacent medium. The invention further discloses another array fiber laser device. The coreless fibers are used for introducing the pump light into the multi-core optical fiber, and side pumping is performed on the gain fibers in the multi-core fiber for multiple times, so that multi-wavelength signals are amplified. The invention further discloses two manufacturing methods of the multi-core fiber. The laser device or an amplifier can realize multi-wavelength laser output and signal amplification, is an all-solid-state device, and is easy to operate, simple in structure and manufacturing process and low in cost.