93results about How to "Improve output beam quality" patented technology

A monolithic passively Q switched microlaser includes an optically transparent heat conductive element bonded to a gain medium, which is in turn bonded to a saturable absorber, which may also be bonded to a second optically transparent heat conductive element. Only the gain medium and saturable absorber are disposed within the laser resonator.

A large-mode-area (LMA) optical fiber (10) that operates as a single-mode optical fiber. The optical fiber includes a core region (20) surrounded by an inner cladding (32), which in turn is surrounded by an outer cladding (40). The inner cladding includes at least one up-doped ring region (32R1). The ring region is configured to form a large attenuation differential between the higher-order modes and the fundamental mode so only that the fundamental mode remains traveling in the optical fiber. If necessary, the optical fiber can include a bend (10B) having a select “resonant” bend diameter (DB) that increases the relative attenuation of the fundamental and higher-order modes. The optical fiber supports an effective mode field diameter (MFD) of up to 40 μm to 50 μm. As a result, detrimental non-linear effects are suppressed, which allows the optical fiber to carry substantially more optical power than conventional LMA optical fibers. The LMA optical fiber is thus eminently suited for a number of optical-fiber-based applications calling for high optical power, such as fiber lasers and pump sources for wavelength conversion.

A spectrum measurement system with multi-spectrum section in infrared laser continuous tuning and high-resolution type is prepared as forming near infrared spectrum subsystem by ECDL laser, laser power supply, gas absorption pool, near infrared photoelectric detector, data collection- process circuit and computer; forming intermediate infrared spectrum subsystem by ECDL laser, DFB laser, laser power supply, 1/2 wave plate, beam combination mirror, achromatic glued mirror, PPLN nonlinear crystal, CaF2 lens, Ge filtering plate, non-spherical surface mirror, gas absorption pool, MCT photoelectric detector, etc.

An air-cored fiber of cladding gain guided microstructure includes a core area and a cladding area. The invention is characterized in that the core area is air-cored and is filled with air; the cladding area includes an internal cladding area and an external cladding area; the cladding area surrounds the core area; the internal cladding area introduces laser materials and the external cladding area is made of solid materials with evenly distributed refractive index; the thickness of the solid material between the hollow core area and a first air hole in the internal cladding area or the air gap is smaller than one wavelength. The fiber is provided with a great model area. The fiber laser adopting such fiber is more conducive to the realization of high power, in addition to the advantages of high gain, high conversion efficiency, low threshold value, good quality of output beam, simple structure and high reliability.

The invention discloses a two-dimensional vertical-cavity surface-emitting laser array with high light beam quality, belonging to the technical filed of a semiconductor laser device, and relating to alaser device array. The invention aims to solve the technical problems of providing a two-dimensional vertical-cavity surface-emitting laser array with high light beam quality. The technical scheme to solve the technical problems comprises a surface electrode, a central zone single unit laser device, first circular ring unit laser devices and second circular ring unit laser devices, wherein, thecenter of the array is the central zone single unit laser device, and the first circular ring unit laser devices are evenly distributed on a concentric circular ring on the outer side of the array; the second circular ring unit laser devices are evenly distributed on the concentric circular ring on the outer side of the first circular ring, and the number of the first and the second circular ringunit laser devices is same; the diameters of the unit laser devices on the same circular ring are same, and the diameters of the unit laser devices on different circular rings respectively reduce frominternal to external; the central zone unit laser device and the unit laser devices on the same direction of each concentric circular ring are in rayed arrangement on the same radius.

The invention discloses an all-optical fiber broadband flat intermediate-infrared super-continuum spectrum light source. The light source is characterized in that the light source comprises a thulium-doped mode-locked fiber laser module used for generating ultra-short pulses, a thulium-doped fiber amplification module used for generating high-power and high-order soliton pulses, a 2-3 micron high-power SC spectrum generation module used for generating 2-3 micron high-power SC spectrum laser, a silica fiber and chalcogenide fiber efficiently-coupled and encapsulated module and a 2-5 micron intermediate-infrared broadband flat SC spectrum generation module for generating a 10dB-bandwidth coverage 2-5 micron intermediate-infrared band broadband flat SC spectrum, wherein the thulium-doped mode-locked fiber laser module, the thulium-doped fiber amplification module, the 2-3 micron high-power SC spectrum generation module, the silica fiber and chalcogenide fiber efficiently-coupled and encapsulated module and the 2-5 micron intermediate-infrared broadband flat SC spectrum generation module are arranged sequentially. According to the light source, quartz optical fiber tapering and lens optical fibers are used in a matched manner, so that efficient coupling of quartz optical fibers and chalcogenide optical fibers can be realized, and pumping efficiency can be improved, the high-quality full-optical fiber broadband flat intermediate-infrared SC (super-continuum spectrum) light source can be realized; since the light source is of a full-optical fiber structure, the intermediate-infrared SC spectrum light source has the advantages of low cost, high conversion efficiency, high-quality output beams and simple and compact structure.

A solid-state laser generating a green continuous laser and a method thereof are disclosed. The laser comprises a pumping source used for generating 798-801nm pumping light, a light splitting unit, an optical path conversion unit, an Er3+:YAlO3 crystal, a resonant cavity and two Fabry-Perot etalons. The light splitting unit is used for splitting the pumping light into a first light beam and a second light beam. The first light beam is entered into a first end surface of a laser crystal. The second light beam is entered into a second end surface of the laser crystal through the optical path conversion unit. The laser crystal is used for generating up-conversion fluorescence under excitation of the first light beam and the second light beam. The resonant cavity is used for outputting a laser of a green light wave band. The two Fabry-Perot etalons are located in the resonant cavity and are used for compressing a line width of an output laser. The structure of the laser is simple, cost is low and green-light continuous output of a narrow line width is realized. The invention also provides a method of generating the green-light continuous laser. Advantages that output laser beam quality is good; the line width is narrow; optical to optical conversion efficiency is high and so on are possessed.

The invention relates to an off-axis spectrum beam combination device of a laser diode array, which comprises a laser diode array and a fast axis collimation lens, wherein the rear side of the fast axis collimation lens is provided with a first lens, a second lens and a high-reflection mirror are sequentially arranged above the rear of the first lens, and rear end faces of the high-reflection mirror and the second lens as well as the first lens and the diode array form an off-axis outer feedback cavity; a diffraction grating is arranged below the rear of the first lens, an output coupling mirror is arranged between the diffraction grating and the first lens, a spectrum beam combination structure is formed among the output coupling mirror and the diffraction grating as well as the first lens; and light rays emitted upwards by the laser diode array are subjected to divergence-angle compression through the first lens and the second lens and then projected on the high-reflection mirror, light rays parallel to the high-reflection mirror are reflected to the fast axis collimation lens, light rays emitted downwards by the laser diode array irradiate to the diffraction grating through the lower part of the first lens, and are processed through the output coupling mirror after being diffracted by the diffraction grating, part of the light rays are fed back to an active region of the diode array along the original path, and part of the light rays are output used as laser. The off-axis spectrum beam combination device has a simple and compact structure, can improve the beam quality of the two-dimensional laser diode array and is safe and reliable.

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 discloses a graphene photonic crystal terahertz amplifier and a regulating and control method thereof. Due to the characteristics that the conductivity of graphene at specific temperature and bias voltage is a negative value in a terahertz wave band, the graphene can be used as a terahertz wave gain medium, and the function of the terahertz amplifier can be achieved by using a periodic 'graphene-single crystal silicon layer' one-dimensional photonic crystal structure. According to the graphene photonic crystal terahertz amplifier, different bias voltages can be applied by alternatively introducing positive and negative electrodes to the graphene which is periodically arranged, and active regulation and control on terahertz wave amplification and working frequency are achieved. As the one-dimensional photonic crystal structure is combined with the terahertz gain characteristics of the graphene, due to the cascade connection of a plurality of pieces of graphene, and the photonic band gap, the slow light enhancement, the F-P effect and the mode competitive effect of the one-dimensional photonic crystal structure, the gain amplification coefficient and the Q-value of the terahertz waves in a single transmission mode can be effectively increased, and the single-frequency terahertz wave output with the high gain and high Q-value is achieved. The graphene photonic crystal terahertz amplifier works in a frequency band of 1-2THz, the working frequency can be tuned according to working voltage, the maximum output gain is greater than 30dB, the Q-value is greater than 50, and the graphene photonic crystal terahertz amplifier is a large-format high-performance terahertz amplifier.

Guided adiabatic bend transitions for multimode fibers are presented to preserve the power of guided light in the fundamental mode while guiding from one level of curvature to another for improved operation of mode filters and fiber amplifiers. A method is provided to find the guidance path. Implementations of these transducers include modal power back converters, and guidance paths into and out of higher order mode filtering devices which work on bending. A spiral structure is shown to incorporate adiabatic bends for a forward-pumped fiber amplifier.

The invention discloses a toroidal concave reflector laser cavity resonator which comprises a reflector, a laser medium and an output mirror and the toroidal concave reflector laser cavity resonator is characterized in that: the reflector is toroidal and concave and comprises one or more homocentric and toroidal arc concave faces. The invention can make the center of the reflecting surface into a round surface or the center of the reflector surface into a non reflecting surface or an air core. The invention can also adopt a toroidal concave output mirror. The laser cavity resonator of the invention has simple processing, convenient adjustment, stable working, large available mode volume, very small divergence angle and good beam quality, thus being applicable to middle, high power gas lasers or solid lasers and especially being applicable to gain medium of large volume and toroidal and columnar gain medium.

The invention relates to an end-pumped active Q-regulated outer cavity frequency doubling green-light laser which comprises a laser pumping source, an energy transmission fiber, an optical coupling system, a V-type folding resonant cavity, a laser crystal, an active Q-regulated switch, a steering mirror, a focusing lens, a nonlinear frequency doubling crystal, a collimating mirror and a harmonic wave separating mirror. Quasi continuous basic frequency light with high peak power is produced through an active Q-regulated mode and is output; the output basic frequency light is focalized in the nonlinear frequency doubling crystal placed outside a cavity through the lens and produces fine light spot and high power density of the basic frequency light; and green light is output after the frequency doubling crystal. Compared with an inner cavity frequency doubling mode, the outer cavity frequency doubling mode has better stability, a flexible structure and easy regulation. In the outer cavity frequency doubling green-light laser, the efficiency of conversion from the basic frequency light to the frequency doubling light is more than 50 percent; and the average power of the green light is more than 4.5 W. The outer cavity frequency doubling green-light laser is widely applied in industry processing, scientific research, medical treatment, military affairs and other fields.

A one dimension all-metal slab waveguide gas laser comprises a slab waveguide gas discharge area and an optical resonator disposed in a metal vacuum chamber. The gas discharge area is formed by a top and a bottom metal electrodes and metal supporting blocks insolated with the electrodes. A metal liner plate and a metal press plate are sequentially disposed on upside of the metal electrodes. A metal supporting plate is disposed at underside of the metal electrodes. The metal top electrodes are connected with a supply power through link pins of the metal electrodes. An output mirror and a feedback mirror are respectively arranged at two sides of the optical resonator. An output window of the laser is disposed in the vacuum chamber. The present one dimension waveguide gas laser has advantages of good quality of high thermo conducting and simple processing as well as low cost, and can avoid appearing modulation of the output power of the laser which is caused by high order mode of the guide in current two dimension slab guide laser, thereby the quality of optical beam of the laser is improved.

The invention discloses a medium and small power LD parallelly pumped high-power green laser, which comprises a resonant cavity, frequency doubling crystals and parallelly connected end-pumped lasers, wherein the frequency doubling crystals are located in the resonant cavity so as to form a frequency doubling resonant cavity, each end-pumped laser comprises an end-pumped device formed by a pumping source, a coupling mirror and a laser crystal, a sub resonant cavity formed by a first totally reflecting mirror and a second totally reflecting mirror, a Q-switch arranged in the sub resonant cavity and a first output mirror used for reflecting and outputting fundamental frequency pulse laser, an included angle between an optical axis of each end-pumped laser and the first output mirror inside is 45 degrees, and the fundamental frequency pulse laser outputted by each first output mirror generates frequency doubling green laser after passing through the frequency doubling crystal, and the frequency doubling green laser is combined into a beam in the resonant cavity and then outputted from a second output mirror of the resonant cavity. The medium and low power LD parallelly pumped high-power green laser can acquire high laser power output and high beam quality.

The invention discloses a broadband laser system chromatic aberration dynamic compensation device, which comprises a first half-wave plate, a polarizing spectroscope, a first quarter-wave plate, a convex lens, a concave lens group, a concave mirror, a first two-dimensional translation stage, a second two-dimensional translation stage, a second quarter-wave plate, a plane mirror, and a second half-wave plate. The broadband laser system chromatic aberration dynamic compensation device uses image transfer structural design and can significantly improve output beam quality by spatial filtering andsmall hole filtering. The relative distance among the concave lens group, the concave mirror and the convex lens can be controlled by moving the two-dimensional translation stage. The broadband lasersystem chromatic aberration dynamic compensation device can gradually change a beam diameter emitted to the concave lens group, thereby continuously controlling a chromatic aberration compensation amount and being advantageous for precisely optimizing a chromatic aberration compensation effect. The device of the invention can be applied as a chromatic aberration compensation unit to an ultra-short pulse laser system, provides full system chromatic aberration compensation, can also be used in a common optical system, and has a large chromatic aberration compensation range.

The invention provides a laminated forming method of rare-earth ion-doped yttrium aluminum garnet laser ceramics and belongs to the technical field of laser materials. The invention aims at providing the laminated forming method of the rare-earth ion-doped yttrium aluminum garnet laser ceramics which are produced by compressing the ytterbium yttrium aluminum garnet laser ceramic powder raw materials different in concentration gradually in steps. According to the laminated forming method, the Yb ion doping gradient of the first layer is 0.4at.%, the Yb ion doping gradient of the second layer is 1.6at.%, the Yb ion doping gradient of the third layer is 3.6at.%, the Yb ion doping gradient of the fourth layer is 6.4at.% and the Yb ion doping gradient of the fifth layer is 10at.%, and each layer is compressed under the pressure of 100Mpa and stands for 10 minutes. The laminated forming method has the advantages that the concentration gradient is formed in the longitudinal direction to improve the optical characteristics of the ceramics and satisfy application under special conditions, the ceramic structure is optimized by virtue of laminated forming, the compression is tighter and the structure is more reasonable, the internal temperature distribution of the laser ceramic is more uniform and the laser ceramics are prevented from deformation due to thermal effect, the optical characteristics of the laser ceramics are enhanced, the laser output efficiency of the solid laser device is improved and the quality of the output laser beam is optimized.