128 results about "Laser resonance" patented technology

A semiconductor laser device includes a semiconductor laminate structure that includes a light emitting layer that contains In, a p-type guide layer disposed at one side of the light emitting layer, an n-type guide layer disposed at another side of the light emitting layer; a p-type clad layer disposed at an opposite side of the p-type guide layer to the light emitting layer, and an n-type clad layer disposed at an opposite side of the n-type guide layer to the light emitting layer. The semiconductor laminate structure includes a rectilinear waveguide formed parallel to a projection vector of a c-axis onto the crystal growth surface, and a pair of laser resonance surfaces formed of cleavage planes perpendicular to the projection vector.

The invention discloses a 2-micrometer high-pulse energy thulium-doped optical fiber laser of a hybrid pump. The 2-micrometer high-pulse energy thulium-doped optical fiber laser comprises a first fiber grating, a first fiber beam combiner, a second fiber beam combiner, a gain fiber and a second fiber grating, which are connected in sequence, wherein a first pumping source is connected with a second input end of the first fiber beam combiner through a first optical isolator, a second pumping source is connected with a second input end of the second fiber beam combiner through a second optical isolator, the first fiber gating and the second fiber gating form a laser resonance cavity, the first pumping source is a continuous laser diode, the second pumping source is a pulsed laser, and the gain fiber is a thulium-doped fiber. The 2-micrometer high-pulse energy thulium-doped optical fiber laser is reduced in the threshold valve energy of a pumping pulsed light in a gain switch technology, is capable of obtaining pulse with higher energy compared with other laser pulse producing technologies such as regulating Q and mode locking, has the characteristics of full-fiber connection, simple structure and the like, and brings convenience for application and popularization.

The invention discloses a Watt-level all-solid ultraviolet laser cleaner and a laser cleaning method, which pertains to the optical energy cleaning technology field and are applied to cleaning micro electronic substrate such as the integrated circuit. The power of the cleaner is connected with a laser resonance chamber; two non-linear optical crystals, a selective microscope and a reflector are positioned in the light path of pulsed laser from the laser resonance chamber; a rotating mirror drum is fixed above one side of the reflector; a work piece to be cleaned is arranged on a convey belt; a blower is positioned at one side of the convey belt and a cleaner is arranged at the other side. By adopting the method, substrates to be cleaned can be continuously or discontinuously conveyed to go through the laser which is Watt-level pulse laser with about 266nm and comes from the all-solid laser; proper laser intensity, pulse frequency and irradiation time can be controlled to effectively remove micron and submicron particles, organics, oily contamination, etc. on the surface of the substrate. The adhesion of the coating after cleaning and the product yield rate are greatly improved and the warp or spalling of the coating rarely happens.

The invention discloses a solid laser resonator system of automatic optimizing laser pattern, which comprises the following parts: output cavity lens, reflective deforming lens, gain dielectric, narrow-band filter, facular detector, beam splitter, power meter, high-pressure amplifier, main control computer, telescope, image gathering card, focal lens and control algorism. The invention utilizes reflective deforming lens with high reflectance to replace common plane reflective lens as reflective end lens of resonator, which generates kinds of high-low stepped optical aberration to inhibit high-step laser, in order to output high-brightness basic mould. The invention possesses simple structure to be controlled conveniently, which improves the quality of output beam without reducing the output power.

The present invention includes a laser amplifier and a method of making the same. The laser amplifier of the present invention includes a gain medium layer having a first index of refraction, and a coupling layer optically coupled to the gain medium. In the various embodiments described herein, the coupling layer can have a second index of refraction less than the first index of refraction. The laser amplifier described herein can also include an evanescent layer disposed between the gain medium and the coupling layer. The evanescent layer can have a third index of refraction less than the second index of refraction. The laser amplifier provides high power, efficient laser resonance through frustrated total internal reflection and total internal reflection while simultaneously providing for the minimization of waste heat in the gain medium layer.

The present invention relates to a fluid shockwave reactor. The fluid shockwave reactor introduces laser resonance theory into the field of fluid physics. It consists of a shockwave resonance energy concentration device and at least one set of jet collision device. The shockwave resonance energy concentration device can enhance the shockwave strength produced during jet collisions; strengthen the ultrahigh pressure and cavitation effect of the shockwave field; it can also intensify physical and chemical effects on the processed materials. The fluid shockwave reactor can achieve ultrafine crushing on the fluid materials with lower energy consumption. Under certain technological conditions, the fluid shockwave reactor may also effectively catalytize the chemical reaction process on fluid materials.

The invention discloses an LD pumped co-gain double-cavity very large frequency difference double-frequency Nd:YAG laser, comprising: LD, LD controller, LD tail fiber, collecting optical system and laser resonance cavities, where the left end face of the Nd:YAG crystal and a first output coupling mirror compose a straight line cavity, KTP frequency doubling crystal and polarizing light splitting prism are arranged in order behind the Nd:YAG crystal in the straight line, a second output coupling mirror is arranged in the direction vertical to the axis of the straight line cavity and in the position corresponding to the polarizing light splitting prism, the left end surface of the Nd:YAG crystal and the second output coupling mirror compose a right angle cavity, the two resonance cavities contain the same Nd:YAG crystal and birefracting filter plate composed of polarizing light splitting prism and KTP frequency doubling crystal, making them both operate in single longitudinal mode; the straight line cavity and the right angle cavity can contain two KTP frequency doubling crystals which compose two birefracting filter plates with the polarizing light splitting prism, thus making the two resonance cavities both operate in single longitudinal mode. And two single-frequency green lights outputted by the straight line cavity and the right angle cavity are merged into orthotropic linear polarizing double frequency 532 green light whose maximum frequency difference can reach 360GHz.

The invention provides a dual-wavelength Q-switched pulse fiber laser comprising a first laser pump source, a second laser pump source, a light beam combination device, a diachronic mirror, a coupling lens, a dual-cladding Er <3+>-doped ZBLAN fiber, a first collimating lens, a focusing lens, an equivalent saturable absorber, a second collimating lens, and a high reflector. The light beam combination device, the diachronic mirror, the coupling lens, the dual-cladding Er <3+>-doped ZBLAN fiber, the first collimating lens, the focusing lens, the equivalent saturable absorber, the second collimating lens, and the high reflector are connected in sequence. The first laser pump source and the second laser pump source are connected with the light beam combination device. The reflection wavelength of the high reflector is 3 to 5 microns. The high reflector and the front end surface of the dual-cladding Er <3+>-doped ZBLAN fiber form a laser resonance cavity; and in the dual-cladding Er <3+>-doped ZBLAN fiber, the energy level transition of the Er <3+> ion corresponds to transition radiation of the wavelength of 3.2 to 3.9 microns, thereby realizing output of high-power pulse laser with the wavelength larger than 3 microns. On the basis of the way, a problem that the traditional fiber laser uses a single wavelength pump source and thus laser with the wavelength larger than 3 microns can not be generated easily can be solved.

The present invention relates to a method for making erbium doped high-silica infrared luminescent glass. Said method includes the following steps: (1), selecting high-silica porous glass, SiO2 content in said glass is 95-98 wt%; (2), preparing solution containing erbium ion, the erbium ion concentration range is 0.02-0.42 mole/L; (3), soaking the high-silica porous glass in the solution containing erbium ion to form high-silica porous glass containing erbium ion; and (4), drying and solid-phase sintering in high-temperature furnace at 1050-1200deg.C so as to obtain the invented product. Said glass can produce infrared red light nearby frequency range of 1.53 micrometer, and can produce laser light of 1.54 micrometer in laser resonance cavity.

The invention relates to an optical-fiber laser, in particular to a 1.7mum all-optical-fiber thulium-doped quartz optical-fiber laser based on a two-directional pumping structure. The 1.7mum all-optical-fiber thulium-doped quartz optical-fiber laser comprises a pumping source, an isolator and a laser resonance cavity, wherein the laser resonance cavity comprises an optical-fiber Bragg grating A, an optical-fiber Bragg grating B, an optical-fiber Bragg grating C, a wavelength division multiplexer and a thulium-doped quartz optical fiber. The 1.7mum all-optical-fiber thulium-doped quartz optical-fiber laser has the advantages that high-reflectivity optical-fiber grating at the wavelength position of the pumping source to reflect forward pumping light which cannot be completely absorbed back into the laser resonance cavity so as to form a simple and ingenious two-directional pumping structure. Due to the structure, the problem of low pumping-light absorbing efficiency caused by low doping concentration and short length of thulium-doped gain optical fiber can be effectively solved.

The invention relates to a third harmonic laser generating method, which comprises a pumping resource, a Q switch, a duplex frequency nonlinear crystal, a triplicate frequency nonlinear crystal and a plurality of reflecting mirrors. The high power density fundamental wave light generated by the pumping resource pump acts on the duplex frequency nonlinear crystal so as to generate second harmonic laser; the second harmonic laser and the high power density fundamental wave light generated by the pumping resource pump synchronically is emitted into the triplicate frequency nonlinear crystal to be summed so as to generate third harmonic laser to be output out of a laser resonance cavity; the duplex frequency nonlinear crystal, the triplicate frequency nonlinear crystal and the pumping resource are all positioned in the laser renounce cavity. The present invention develops a diode array side pumping ultraviolet 355nm laser so as to get ultraviolet 355nm laser output with high basic mold and light conversion rate and long service life.

The invention discloses a laser resonance Raman method for extra-high-voltage corona discharge early diagnosis. A diagnosis system adopted in the method is composed of a remote laser resonance Raman testing system (1) and a rotary lifting adjusting support (19). The remote laser resonance Raman testing system is composed of a main control analysis subsystem (10), a visible light imaging system (9), an ultraviolet source subsystem (12), a cassette telescope (21), an ultraviolet spectrograph (4) and an optical accessory. Corona discharge early diagnosis can be achieved by carrying out laser resonance Raman spectrum detection on extremely tiny amounts of ozone, nitrogen oxide and nitric oxide gas molecules produced in the early-stage corona discharge chemical effect. According to the laser resonance Raman method for extra-high-voltage corona discharge early diagnosis, remote visible spectrum detection operation is achieved through the visible light imaging and laser resonance Raman spectrum detection optical path sharing and automatic focusing technology, ozone molecule molecular resonance Raman spectrum detection with extremely high sensitivity is achieved, and nitric oxide and nitrogen dioxide Raman spectra are effectively detected.

The invention belongs to the technical field of measurement and particularly relates to an optical resonant cavity mode and loss measurement device based on an optical cavity ring-down method. The measurement device comprises a laser, an acousto-optic switch, a first spherical reflector, a plane reflector, a second spherical reflector, a polarizer, a resonant cavity fixing platform, a spectroscope, a high-resolution CCD telescoping collimation system, an image acquisition card, a high-speed detector, a high-speed data acquisition card, a master control computer, an acousto-optic switch driver and a manual piezoelectric ceramic driver. According to the device, by monitoring the specified intrinsic mode in the optical resonant cavity and the light intensity attenuation characteristic time in the cavity, the intrinsic mode and the loss of the optical resonant cavity can be accurately measured at the same time, the measurement accuracy is high, and operation is convenient to perform. Through the device, the loss in the installing and adjusting process of an annular laser resonance cavity can also be well completed, and the device has important significance in improving the performance of laser gyroscopes and the percent of pass in production.

The invention relates to an intermediate infrared femtosecond mode-locked laser which comprises a collimating mirror, a focusing mirror, an input spherical surface mirror, a laser medium and a spherical surface high-reflection mirror which are sequentially arranged along a direction of a pumping light beam outputted by a laser diode, wherein lasers in a five-mirror laser resonance cavity formed by the input spherical surface mirror, the spherical surface high-reflection mirror, the spherical surface high-reflection focusing mirror, an output coupling mirror and a graphene mode-locking element is reflected onto the high-reflection focusing mirror through the input spherical surface mirror, is focused on the graphene mode-locking element, returns back along the original path by sequentially passing through the spherical surface high-reflection focusing mirror, the input spherical surface mirror, a laser crystal and the spherical surface high-reflection mirror, is deflected and reflected to a dispersion compensation prism pair by the spherical surface high-reflection mirror, and is output from the output coupling mirror through a slit. According to the intermediate infrared femtosecond mode-locked laser, graphene growing by adopting a CVD (Chemical Vapor Deposition) method is transferred to a laser wavelength high-reflection mirror, and is protected by using inert gas, and thus stable mode-locked laser pulse output is realized in an intermediate infrared band. The intermediate infrared femtosecond mode-locked laser has the advantages of being simple in regulation, low in manufacture cost, and easy to realize single layer (little non-saturated loss).

The invention provides a crystal laser device side pumped by laser diode and employing a fluorinated lutetium-lithium crystal dual-doped with thulium and holmium, which is characterized by adopting laser diode array side pump; a laser resonance cavity consists of a back reflection mirror and a front reflection mirror between which Tm:Ho:LuLF crystal is disposed. The invention has compact structure, low pumping threshold value, large pulse energy and the laser output wavelength is approximately 2 mum m, and the pulse repetition frequency is adjustable, so that the invention has widely application prospect on the aspects of laser ranging, coherent Doppler wind-finding radar and so on.

The invention discloses a double-resonance vertical-cavity surface-emitting laser structure for generating terahertz wave and microwave and relates to the field of optoelectronic devices. The structure comprises a lower metal electrode, an n-type substrate, a lower distributed feedback Bragg reflector, an n-type phase matching layer, a gain area, a p-type phase matching layer, an upper distributed feedback Bragg reflector, a passivation layer and an upper metal electrode which are sequentially arranged from bottom to top; the structure is characterized in that the length d of a laser resonance cavity is formed by the optical thickness of the n-type phase matching layer, the optical thickness of the gain area, the optical thickness of the p-type phase matching layer, and energy transmission depth of laser in the lower distributed feedback Bragg reflector and the upper distributed feedback Bragg reflector; the length d of the resonance cavity is required to meet the equation as follows: d=c/2omega; if the omega is greater than 0.1THz and smaller than 10THz, the terahertz wave is generated; if the omega is greater than 300MHz and smaller than 300GHz, the microwave is generated. Compared with the existing terahertz light source, the double-resonance vertical-cavity surface-emitting laser structure for generating the terahertz wave and the microwave has the advantages of integration, miniaturization, working at room temperature and easiness in formation of two-dimensional arrays.

A method for detecting concentration of gas based on circular optical fiber laser includes applying conical optical fiber, raising measurement accuracy by utilizing laser resonance to increase effective action length based on evanescent wave absorption in optical fiber laser cavity and realizing concentration measurement of different gas by applying tunable filter.

The invention provides a far-end pumping erbium-doped optical fiber amplifier. The amplifier comprises a pump light source and an erbium-doped optical fiber amplifier body which are connected through a pump transmission optical fiber, wherein the pump light source is a high-power laser with a wavelength being 1390nm, one end of the pump transmission optical fiber is connected with the pump light source through a high-reflectivity fiber bragg grating with a wavelength being 1480nm, and the other end of the pump transmission optical fiber is connected with the erbium-doped optical fiber amplifier body through a low-reflectivity fiber bragg grating with a wavelength being 1480nm. A laser resonance cavity is formed by the fiber bragg grating pair, and high-efficiency frequency shift from laser with the wavelength being 1390nm to laser with the wavelength being 1480nm is realized. The far-end pumping erbium-doped optical fiber amplifier overcomes the defect of low Raman frequency shifting efficiency in 1390nm laser transmission, sufficient 1480nm pump laser can be obtained after longer optical fiber transmission, the power of 1480nm pump laser obtained through the optical fiber amplifier is increased by more than 3dB than that of the 1480nm pump laser obtained in a traditional manner; with the adoption of the far-end pumping erbium-doped optical fiber amplifier, a larger signal gain can be obtained under the condition of the same distance, or a further pump transmission distance can be realized under the condition of the same signal gain.

The invention discloses a laser working head with variable width of a cladding layer, belonging to the technical field of laser processing. The laser working head comprises a concave reflection mirror assembly, a convex reflection mirror assembly, a protection lens assembly and an adjusting assembly. A focusing system integrated with the working head comprises a convex reflection mirror and a concave reflection mirror; and because of the optimized optical design, the changes of the output focal length of the focusing system is realized by a manner of changing the distance between the two mirrors. Because of the installation of protection lens, partial thermal radiation light can be effectively prevented from entering a laser resonance cavity. For fiber lasers and semiconductor lasers, the stability of output power can be effectively ensured. During the laser cladding process, the working head can realize the real-time changes of the width of the cladding layer.

The invention discloses a radial polarization beam laser. The radial polarization beam laser comprises an output cavity mirror (101), a pumping source (102), a gain medium (103) and a symmetrical polarization selecting assembly (104). The output cavity mirror is a mirror plane reflecting one part of light emitted by the laser and transmitting the other part of the light emitted by the laser, and the output cavity mirror outputs one part of the laser generated by the laser in a coupling mode and reflects the other part of the light to the laser to maintain laser resonance. The pumping source provides energy for the laser gain medium, and the laser gain medium is excited to jump to a higher energy level. The radial polarization beam laser structurally comprises the pumping source, the gain medium and the symmetrical polarization selecting assembly, wherein the pumping source and the gain medium provide energy for the laser resonance, the symmetrical polarization selecting assembly is composed of a barrel-shaped polarization mold, a reflecting mirror and a conical reflector. Polarization of a beam in a cylindrical symmetry mode can be achieved through the symmetrical polarization selecting assembly, and thus beam output of the radial polarization laser is achieved. The radial polarization beam laser is clear in structure, high in stability and capable of achieving high-power output.

The invention discloses a high-efficiency all-fiber cylindrical vector beam laser. Since the few-mode long-period fiber grating can realize high-efficiency conversion from the fundamental mode to the first-order mode at the resonant wavelength and has the characteristics of low insertion loss, the few-mode The long-period fiber grating is introduced into the laser cavity as a mode conversion device to improve the mode conversion efficiency and reduce the loss in the cavity to achieve high-efficiency output of the cylindrical vector laser beam. The laser includes an amplifier module, which is used to provide laser generation and amplification; a resonator module, which is used to realize laser resonance; a polarization control module, which is used to control the polarization state of the laser in the cavity; for high-efficiency mode switching. The cylindrical vector beam output by the laser has the characteristics of high efficiency, low threshold, high purity, and mode switchable, and has no spatial coupling structure, high stability, good portability, and is suitable for commercialization.

This invention discloses one direct angle inner and outer round tamper total reflection lens laser resonance chamber, which comprises total reflection lens, plane output lens and laser work medium, wherein, the reflection lens is of right angle reflection lens and inner lens combination; the right angle outer round surface outer tamper surface and inner lens are as reflection surface; right angle outer round tamper reflection lens and inner lens have central axis lines overlapped with height H larger than zero and less than right angle inner round tamper height.

The invention discloses a semiconductor laser with enhanced luminous efficiency. According to the laser, on the basis of a traditional semiconductor laser preparation technology, high-vacuum equipment is adopted to performing cleavage on a laser epitaxial wafer in an ultrahigh-vacuum environment and cavity surface metal nanometer particle and cavity surface film preparation are performed. According to the laser disclosed by the invention, uniformly distributed metal nanometer particles are prepared on laser resonance cavity surface, free electrons of metal nanometer particles are utilized to be coupled with incident electromagnetic waves, collective oscillation of free electrons is caused, an enhanced local area electric field is generated, a strong near field enhancing effect is provided, radiative recombination of active region carriers of the laser is enhanced, and improvement of the luminous efficiency of the semiconductor laser device is realized.

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 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.