108results about How to "Improve frequency doubling efficiency" patented technology

The invention discloses an intra-cavity frequency doubling green-ray fiber laser with a full optical fiber structure. The laser comprises a pumping assembly, a first fiber bragg grating, a third fiber bragg grating, a second fiber bragg grating and a first tail fiber, wherein the output end of the pumping assembly is connected with the first fiber bragg grating; the first fiber bragg grating, the third fiber bragg grating and the second fiber bragg grating are arranged concentrically; a double-pack yttrium-doping optical fiber is connected between the first fiber bragg grating and the third fiber bragg grating; an intra-cavity frequency doubler is connected between the third fiber bragg grating and the second fiber bragg grating; the output end of the second fiber bragg grating is connected with the first tail fiber; and all the components are connected in a molten connecting mode. According to the invention, an optical fiber laser technology and a full-solid intra-cavity frequency doubling technology are combined by the laser, intra-cavity frequency doubling is realized by adopting the full optical fiber structure, the laser outputs at the green ray wave band, the defects caused by the formation of discrete components for the existing laser are overcome, the optical conversion efficiency is improved, the output light bundle has good quality, the light-light conversion efficiency is high, the structure is compact, the performances are stable, and the frequency doubling efficiency is approximate to 100%.

The present invention relates to a high-efficiency laser frequency multiplier device. It includes basic frequency laser, light-beam beam splitter, coherent beam synthesizer and non-linear crystal. After the basic frequency laser is undergone the process of beam-splitting treatment, the coherent synthesis can be implemented, then the synthesized laser can be used as pump source of frequency multiplication laser to pump non-linear optical crystal finally can output multiple frequency laser with high conversion efficiency.

Disclosed is an all-solid-state double frequency yellow Raman laser device with a coupled cavity, which includes a LD (laser diode) pump source and a resonator. The resonator is composed of a rear cavity mirror, a coupling lens and an output lens; a laser amplifying medium, a Q value adjusting device and a Raman crystal are arranged between the rear mirror and the coupling lens; a frequency doubling crystal is arranged between the coupling lens and the output lens. The temperature of the laser amplifying medium, the Q value adjusting device, the Raman crystal and the frequency doubling crystal is controlled by a cooling device. Compared with prior art, the laser device of the invention has small volume, high output power and high conversion efficiency. Due to the small volume, stable performance and low cost, the laser device can be widely used in laser medical treatment field.

The invention discloses a green light output fiber laser, which comprises a fundamental frequency laser system and a frequency doubling system. The frequency doubling system uses a collimating and focusing lens group to collimate and focus the laser output from the The laser is separated into two beams of linearly polarized light whose propagation direction is 90 degrees and the polarization directions are perpendicular to each other. The linearly polarized light is deflected in the direction of propagation by a mirror, and the two beams of polarized light are doubled by a frequency doubling crystal to obtain a green laser output. , the polarization beam combiner superimposes two green laser beams, and realizes high-power green light output through the output mirror. The invention can realize the secondary frequency doubling of the traditional polarized fiber laser, effectively improve the frequency doubling efficiency of the fiber laser, and realize high-power green laser output. It has the advantages of high frequency doubling efficiency and good stability, and is suitable for applications in the fields of laser projection, underwater imaging, and glass and other non-metallic material processing.

The invention disclose a two-crystal compound gain inner cavity Raman yellow light laser which comprises: the gain laser diode pumping source emits 808nm pumping light which is partly absorbed by the Nd: YAG crystal and Nd: YVO4 crystal coaxial placed, the two crystals provide the laser gain at the same time, The 1.06 mum laser polarization of the base frequency is Pi polarization which generates in the resonant cavity which is composed of the whole mirror and the yellow light output mirror; the base frequency laser passes Nd: YVO4 crystal obtains the Raman gain, 1.18 mu m stokes light generates outreaching by the oscillation after outreaching the Raman scattering threshold value; 1.18mum anti-Stokes light is multiplied through the crystal multiplier, the 588nm yellow light is generated and output through the output mirror. The technical scheme depends on double crystal compound gain to guarantee laser polarization so as to increase the multiplier efficiency; higher pump power is exerted depending on high Nd: YAG crystal heat rupture threshold value, therefore the yellow output power is increased.

The invention discloses an improved radiating GaAs-based terahertz frequency doubling Schottky diode, and relates to the technical field of terahertz frequency doubling Schottky diodes. The improved radiating GaAs-based terahertz frequency doubling Schottky diode comprises a semi-insulating GaAs substrate, heavily-doped GaAs layers arranged on the semi-insulating GaAs substrate, lightly-doped GaAs layers arranged on the heavily-doped GaAs layers, silicon dioxide layers, ohmic contact metal layers and passivation layers. The improved radiating GaAs-based terahertz frequency doubling Schottky diode is characterized in that all the passivation layers are made of adamas. According to the improved radiating GaAs-based terahertz frequency doubling Schottky diode, the adamas which is high in heat conductance is used as the passivation layers of the terahertz frequency doubling Schottky diode, so that the radiating performance of the Schottky diode is greatly improved, and the frequency doubling efficiency of the Schottky diode is improved.

The present invention provides a laser, especially a frequency doubling single direction overlapping output quasi-cw green laser in a full-solid multi-cavity combined cavity, composed of three or more F-P, each F-P adopts flat-concave cavity structure, F-P adopts side pumped Nd:YAG crystal of the semiconductor laser pumped component having same model, each F-P is optimized design by computer simulation, a stably rotatable 1064nm fundamental frequency laser is formed in the F-P, each F-P obtains 532nm quasi-cw green laser by the audio-optical Q switching and frequency doubling technology, overlapping in the several frequency doubling crystals, reflecting by the harmonic reflector, obtaining secondary frequency doubling and output together. The laser does not need any thermal lens and thermal double refraction compensation element, having high output power, better beam quality, high doubling efficiency, better stability, widely used for fields of laser material process, optical storage, laser full color display, laser medicine, scientific research, communication, defense and amusement.

The invention discloses a high-power narrow-linewidth continuous wave visible light optical parametric oscillator, comprising a pump laser and an annular resonant cavity; pump light generated by the pump laser enters the resonant cavity from an input mirror, and is reflected to an optical parametric oscillator nonlinear crystal by a first reflector for transformation; signal light, idler frequency light and rest pump light are output, and the rest pump light passes through a second reflector and a third reflector and then is output; the signal light is reflected to the input mirror by the second reflector, the third reflector, a fourth reflector, an optical parametric oscillator-frequency doubling nonlinear crystal and an output mirror and enters the resonant cavity for continuous oscillation; the idler frequency light is converted into broadband visible light laser by the second reflector, the third reflector, the fourth reflector and the optical parametric oscillator-frequency doubling nonlinear crystal and is output by the output mirror. Single frequency laser of 400nm-540nm is taken as a pumping source, and the annular cavity is taken as the resonant cavity, so the output power is increased, the beam quality is improved, and the linewidth is reduced.

The invention discloses a medicinal all-solid-state yellow laser. The laser comprises a pumping source system and a Z-shaped resonator device, wherein the pumping source system mainly comprises a laser diode (LD), an optical fiber and a focusing coupling lens system which are sequentially arranged on an optical path; the Z-shaped resonator device comprises a tail mirror, a concave folding mirror, a yellow light output mirror and a total-reflection mirror which are sequentially arranged in a Z-shaped chamber; a laser gain medium is arranged between the tail mirror and the concave folding mirror; a Brewster sheet is arranged between the concave folding mirror and the yellow light output mirror; a doubling frequency crystal is arranged between the yellow light output mirror and the total-reflection mirror; and the temperatures of the laser gain medium and the doubling frequency crystal are controlled by a refrigerating device. The medicinal all-solid-state yellow laser has the advantages of simple structure, small volume, high power / energy, high efficiency and good output stability and can obtain a medicinal laser output in a wave band of 561nm.

The invention discloses a royal purple laser device based on frequency doubling alkali metal steam lasers, relates to the technical field of novel laser devices, and solves the problems that an existing solid laser device is low in laser output power and poor in laser beam quality. The royal purple laser device comprises a pump light source structure, an alkali metal steam pool, a resonant cavity and a frequency doubling crystal, wherein the pump light source structure is located outside the resonant cavity, the alkali metal steam pool and the frequency doubling crystal are located in the resonant cavity, and the frequency doubling crystal is placed at a beam waist position of a fundamental frequency light oscillation mold between a front endoscope and an output mirror. Pump light emitted by a laser diode (LD) pump source is output to a coupling lens group through a transmission optical fiber, undergoes coupling focusing and then enters the alkali metal steam pool; under the incentive function of a pump, effective population inversion of alkali metal atoms is realized; fundamental frequency oscillation light is formed in the resonant cavity through feedback of the resonant cavity; and the fundamental frequency oscillation light generates a nonlinear effect in the frequency doubling crystal, is converted into royal purple frequency doubling light and is output through the output mirror. The royal purple laser device has high laser output power and laser beam quality.

The invention discloses a method for generating a third-harmonic-generation ultraviolet laser through a fold resonating cavity. Laser crystal is pumped from the side face of a laser diode, simulated radiation is generated, fundamental frequency light generation is formed in the cavity, fundamental frequency light is converted into pulsed light through a Q switch, the power density of the fundamental frequency light is improved, second harmonics are generated by the fundamental frequency light through frequency doubling crystal, the ultraviolet laser is generated by the remaining fundamental frequency light and the generated second harmonics under the action of sum frequency crystal and is output out of the cavity through an output mirror; ultraviolet emergent light in one direction is reflected to the resonating cavity for vibration in a continued mode by an ultraviolet reflecting mirror outside the fold resonating cavity, so that the ultraviolet light is only output in one direction and loss of the ultraviolet light is reduced. The method of inner-cavity frequency doubling and sum frequency is applied to the fold resonating cavity, the high power density inside the cavity and the large mode volume are utilized, and therefore the ultraviolet laser conversion efficiency is improved.

The invention discloses a frequency multiplication method and frequency multiplier. Wherein, first, accessing input signal into comparator to output square wave signal; second, outputting delayed square wave signal by AND gate delayer with delay time in nano-second level; third, inputting said two signals into two input end of logic AND gate correlator for calculation and output; fourthly, filtering and amplifying the narrow impulse from said correlator to complete the frequency multiplication. Wherein, it also comprises a linear amplifier and a power amplifier. This invention is simple and low cost, and had small phase noise in output signal.

The invention relates to an all solid-state 455nm pulsed laser based on a neodymium-doped fluorinated lutetium lithium crystal, which is suitable for underwater laser communications. The all solid-state 455 nm pulsed laser is characterized by comprising a laser diode output with tail fibers, and a pump optical coupling system, a laser cavity and a multiple frequency crystal are sequentially arranged along the advanced direction of the laser diode outputting a laser, wherein the laser cavity comprises an Nd: LiLuF crystal and an electrooptic Q-crystal. The invention has the characteristics of compact structure, small size, long life and stable working.

This invention discloses a large power semiconductor pump single mode frequency doubled green light laser including a 1064nm basic wave laser medium, an optical pump device, a resonant cavity composed of a plane and a convex mirror, a Q-switching device and a frequency-doubled crystal, among which, a pair of mirrors making up of a hole-expanded telescope is set in the cavity to form a 'Z' like cavity structure together with said plane and convex mirrors, besides, the beam expanding end of said telescope faces the laser medium, and its contraction hole end faces the frequency-doubled crystal, which can increase the quality of laser beams and the frequency doubled efficiency of nm-linear crystals.

The present invention discloses the preparation process and use of potassium fluorocarbonate. The preparation process includes the following steps: setting the mixture of potassium fluoride and alkali metal carbonate in the molar ratio of 1-1.5 into one reaction container, setting the reaction container in sealed environment filled with CO2 at 1.2-1.4 atm. and heating the reaction container to 500-800 deg.c, maintaining for 10-24 hr and cooling naturally to obtain the product potassium fluorocarbonate. The present invention synthesizes potassium fluorocarbonate with potassium fluoride and alkali metal carbonate, and has low cost, high product purity and other advantages.

The invention discloses a 671 nm laser light system used for cold atom experiments. The laser light system comprises a seed laser, a pumping source, an optical resonant cavity, a laser crystal, a frequency doubling crystal and a frequency locking module; the laser crystal and the frequency doubling crystal are located in the optical resonant cavity; the pumping source is used for outputting pumping light; the seed laser is used for outputting seed light; fundamental frequency laser light having the same wave length as the seed light is generated inside the laser crystal after the pumping light enters the optical resonant cavity; the seed light and the fundamental frequency laser light are oscillated in the optical resonant cavity, and are subjected to the frequency doubling processing of the frequency doubling crystal and the frequency locking processing of the frequency locking module to form target single frequency laser light with a predetermined wave length. The technical solution of the invention adopts an injection locking intracavity frequency doubling technique, to realize an output of high-power single frequency 671 nm laser light with an adjustable frequency and a simple-structured cavity, which is easy to realize and can be directly used for cold atom physical experiments.

The invention discloses a frequency multiplier. The frequency multiplier is composed of at least a composite left / right handed non-linear transmission line unit. The composite left / right handed non-linear transmission line unit is formed by connecting a single left-handed non-linear transmission line and a single right-handed non-linear transmission line in series. In combination with the advantages of the left-handed non-linear transmission line and the right-handed non-linear transmission line, the invention can improve the working frequency and the frequency multiplying efficiency of the frequency multiplier.

The invention discloses a 540nm all-fiber high-power green fiber laser, which comprises a semiconductor laser pumping source, a first total reflection fiber grating, a second total reflection fiber grating and a third total reflection fiber grating, a double-clad ytterbium-doped fiber is connected between the first total reflection fiber grating and the second total reflection fiber grating, an intracavity frequency multiplier is connected between the second total reflection fiber grating and the third total reflection fiber grating, the output end of the third total reflection fiber grating is connected with an output tail fiber, and the components are connected in a welding way; and the laser adopts a frequency multiplier cavity structure which consists of an all-fiber structure, the aggregation type intracavity frequency multiplier and the three fiber gratings, and high-stability and high-power green laser output can be realized. The 540nm all-fiber high-power green fiber laser can be widely applied in fields such as laser projection, laser televisions, laser medicine and laser radars, and has the advantages of high beam quality, high frequency-multiplying efficiency, compact structure and stable and reliable performance.

The present invention provides an acoustic-optic Q-switched frequency double laser employing an electro-optic switch to control laser output. The laser comprises a first total reflector, an acoustic-optic Q-switched crystal, a Brewster polarizer, a folding endoscope, an acoustic-optic Q-switched switch, a LD target bar array, a quartz polarization rotator, an Nd:YAG crystal bar, a second total reflector, a frequency double crystal and an output mirror. The first total reflector, the acoustic-optic Q-switched crystal, the Brewster polarizer and the folding endoscope are coaxially arranged, thefolding endoscope, the acoustic-optic Q-switched switch, the LD target bar array, the quartz polarization rotator and the output mirror are coaxially arranged, and the output mirror, the frequency double crystal and the second total reflector are coaxially arranged. The acoustic-optic Q-switched frequency double laser employing an electro-optic switch to control laser output employs a Z-shaped folding cavity to shorten the size of the device, wherein one folding mirror is taken as an inner cavity frequency double laser output mirror, the highlight high conversion efficiency and the frequency double efficiency are maintained in an acoustic-optic Q-switched mode.

The invention provides a direct frequency multiplication device of a semiconductor laser. According to the scheme, laser beams emitted out by the semiconductor laser pass through a spectrum beam combining and narrowing mechanism, an isolator, a coupling lens, a TEC temperature control module, a non-linear frequency multiplication crystal and a second coupling outgoing mirror in sequence and then is output. By adopting the scheme, locked narrowing and mode selection of the length of each beam combining unit are realized, and the laser beams in a space near field and a far field, which are emitted by a light emitting unit, are superposed to form one beam for output, so that the quality of the light beam after the beam combination is greatly improved, the output high in light beam quality is realized under a high power output condition, and the corresponding locked spectrum is high in spectrum brightness.

The invention discloses a double-cavity interconnection V shape structure single-direction overlapping output quasi-cw green light laser which uses two semiconductor laser pumped components with same type pump two Nd:YAG crystals from side surface (semiconductor laser pumped Nd:YAG mode). Two modes are set in a plane concave V shape resonant cavity and a plane concave straight cavity, and form two beam 1064nm basic frequency lights with stabile operation, generate two beam frequency doubled lasers via acousto-optic Q switch and frequency doubled crystal, and reach plane folding mirror, single-direction overlapping output via plane folding mirror, and gain 532nm green light with average power as high as 206W. The laser has stable property, high frequency doubled efficiency, and is wide used in laser material processing, light storage, laser full-color display, laser medicine, scientific research, communication, national defence and amusement etc.

The present invention provides a laser, especially a frequency doubling single direction overlapping output quasi-cw green laser in a full-solid T type double-cavity combined cavity, composed of two F-P, each F-P adopts flat-concave cavity structure, F-P adopts side pumped Nd:YAG crystal of the semiconductor laser pumped component having same model, each F-P is optimized design by computer simulation, a stably rotatable 1064nm fundamental frequency laser is formed in the F-P, each F-P obtains 532nm quasi-cw green laser by the audio-optical Q switching and frequency doubling technology, overlapping in the several frequency doubling crystals, reflecting by the harmonic reflector, obtaining secondary frequency doubling and output together. The whole system finally obtains 532nm green laser which power achieves 202W. The laser does not need any thermal len and thermal double refraction compensation element, having high output power, better beam quality, high doubling efficiency, better stability, widely applied in medical, industry.

A full solid state electro-optic modulation Q green laser adopts a V-shaped folding cavity. An optical coupled system, a plano-concave front cavity mirror, a laser crystal, a polarizer, a 1 / 4 wave plate, an electro-optic modulation Q crystal and a negative meniscus shaped refrative mirror are sequentially arranged along the direction of advance of the laser output by a laser diode. The reflected light path of the negative meniscus shaped refrative mirror is sequentially provided with a frequency doubling crystal and a plano-concave rear cavity mirror. The laser has the advantages of compact structure, high output pulse repetition rate, narrow pulse width, high beam quality, and the like, and can be widely applied to the fields such as laser material processing, laser color display, laser medicine, military confrontation, undersea detection, etc.

Disclosed is an all-solid-state double frequency yellow Raman laser device with a folded cavity, which includes a LD (laser diode) pump source and a resonator. The resonator is composed of a rear cavity mirror, a 45 degrees reflection mirror and a total reflective mirror. The laser device of the invention is characterized in that a laser amplifying medium, a Q value adjusting device, a Raman crystal are arranged between the rear cavity mirror and the 45 degrees reflection mirror of the resonator; a frequency doubling crystal is arranged between the 45 degrees reflection mirror and the total reflective mirror. The temperature of the laser amplifying medium, the Q value adjusting device, the Raman crystal and the frequency doubling crystal is controlled by a cooling device. Compared with prior art, the laser device of the invention has small volume, high output power and high conversion efficiency. Due to the small volume, stable performance and low cost, the laser device can be widely used in laser medical treatment field.

The invention discloses a terahertz two-stage cascade balanced type nonuple frequency multiplier circuit, which relates to the technical field of terahertz circuits. The terahertz two-stage cascade balanced type nonuple frequency multiplier circuit comprises an input waveguide, a cavity, a nonuple frequency multiplication circuit chip and an output waveguide, wherein a terahertz diode in the circuit is manufactured by adopting a GaAs process. The terahertz two-stage cascade balanced type nonuple frequency multiplier circuit comprises a two-stage terahertz balanced diode frequency tripler, andcan realize a nonuple frequency multiplication function. Only one diode is arranged on the single side of each stage of frequency tripler circuit, so that the cut-off frequency of each stage of frequency doubling tube is improved, and higher output frequency doubling loss can be obtained. Each stage of frequency tripler circuit adopts an odd harmonic balance type structure, so that the terahertz two-stage cascade balanced type nonuple frequency multiplier circuit has good symmetry, even-order harmonics can be better inhibited, the power on the diode is reduced, the heat dissipation of the diode is facilitated, and direct current bias can be more conveniently introduced.

The invention discloses a LD side diode-pumped all-solid-state high-power continuous green laser. On the level road of all-plane incident mirror, the laser crystal and planar-concave are installed in turn. A high-power diode-pumped component is set on the side of Laser Crystal. The frequency doubling crystal and planar-concave all-incident mirror are set on the road of folding mirror. The basic frequency light from laser diode LD side after pumping the crystal oscillates and enlarges in the V-type resonator cavity formed by the all-planar mirror, all-concave mirror and planar-concave output mirror, which is output by the output mirror through two-way doubling frequency. The output power is over 40W, and the frequency efficiency is greater than 40%, with good beam quality, high frequency efficiency, and higher stability.

The method for producing green laser of double frequency in high efficiency uses pump light source for pumping laser at side by working crystal, and flat-convex short cavity in 'L' or 'V'shape. Flat mirror and convex mirror are as front and back cavity mirrors. Focus of thermal lens produced by laser working module and radius of curvature of the convex mirror are matched to length of cavity. Using Q adjustment produces quasi-continuous fundamental light in high peak power inside cavity so as to generate oscillation in narrow pulse and high power by infrared fundamental light. Finally, using non-linear crystal in double frequency inside cavity generate second harmonic to output green light. The invention makes size of laser medium basic mode maximum so as to be in favor of improving quality of light beam. Short cavity forms narrow laser pulse, and high power of peak value raises efficiency of double frequency. L' or 'V'shaped cavity eliminates two beams of green light outputted.

The invention relates to a laser treating equipment whose emission wavelength is 593nm, 594nm, or 589nm which is near to ideal the absorption peak 577nm of oxidized hemoglobin, and since it is the full-solid laser treating equipment, compared to dyestuff laser, said treating equipment can significantly reduce the cost. The pulse length of output laser is 3-100ms which is continuously adjustable and each pulse can be divided into two or more 0.2-3ms long-pulse laser. Said long pulse laser treating equipment can replace present dyestuff laser treating equipment to treat the erythema lesion.

The invention relates to design, construction, temperature control and frequency conversion technologies of a blue light laser frequency multiplier, and particularly relates to a monoblock crystal cavity blue light frequency multiplier. The monoblock crystal cavity blue light frequency multiplier can solve demand of photoelectric engineering technologies, optical information and optics frontier scientific research for a blue light laser, and effectively overcomes defects that output results are affected by great loss and unstable cavity length of a separated or semi-separated frequency multiplication cavity at present and that an existing frequency multiplication temperature control device is unstable in time delay and temperature. Stable continuous frequency multiplication blue light output can be acquired through the monoblock crystal cavity blue light frequency multiplier. The design of a balance temperature control structure provided by the invention is conducive to keeping constant crystal cavity temperature, thereby being capable of simultaneously realizing phase matching and cavity resonance accurately. The monoblock crystal cavity blue light frequency multiplier can be widely applied to the process of nonlinear frequency conversion.

The invention discloses a fiber laser frequency doubling device, which includes a fiber collimator that collimates the fundamental frequency light output from the fiber into parallel light output, and a polarization beam splitter that separates the fundamental frequency light with randomly distributed polarization states into two beams in the propagation direction. Two beams of linearly polarized light with 90 degrees and the polarization directions are perpendicular to each other. The linearly polarized light is deflected in the direction of propagation by the mirror. The two beams of linearly polarized light are doubled by the frequency doubling crystal to obtain the frequency doubled laser output. The polarization beam combiner The two frequency-doubled laser beams are superimposed and coupled into the core output of the fiber through the fiber collimator. The invention uses a polarization beam splitter to split the polarization-independent fundamental frequency light and doubles the frequency respectively, thereby effectively improving the frequency doubling efficiency of the fiber laser; a fiber collimator is used to shape the beams of the fundamental frequency light and the frequency doubled light to realize frequency doubling The optical fiber output of the laser can be used as an independent fiber laser frequency doubling device, which has the advantages of high frequency doubling efficiency, good stability and easy operation.