30results about How to "Improve light-to-light conversion efficiency" patented technology

The invention discloses a gain narrowing controlled all-fiber laser amplifier for high-power picosecond pulses. The laser amplifier comprises an all-fiber picosecond seed resource. An optical fiber amplifier is connected to an output end of the all-fiber picosecond seed resource, and an output module is connected to an output end of the optical fiber amplifier; the all-fiber picosecond seed resource is a mode-locked laser in an all-fiber ring cavity structure and comprises a pump laser, a wavelength division multiplexer, a gain optical fiber, an output coupler, a first polarization controller, a polarization beam splitter, a second polarization controller and a polarization independent isolator; and a polarization-maintaining output end of the polarization beam splitter serves as an output end of the all-fiber picosecond seed resource, a non polarization-maintaining output end of the polarization beam splitter is connected with an input end of the polarization independent isolator, the second polarization controller is fixed on an optical fiber between the polarization beam splitter and the polarization independent isolator, and an output end of the polarization independent isolator is connected with the other input end of the wavelength division multiplexer, accordingly, an all-fiber ring structure is formed. By means of the gain narrowing controlled all-fiber laser amplifier for high-power picosecond pulses, long-term stable high-power picosecond pulse laser is obtained easily, and the manufacture cost of a high-power optical fiber laser system can be reduced.

The invention discloses a femtosecond laser device based on single cladding neodymium optical fibers and a ring cavity and a manufacturing method. The femtosecond laser device comprises a cavity part and a space optical path part, wherein the cavity part comprises 808 nm single mode semiconductor optical pumps (1), 808 nm optical fiber type single mode isolators (2), 808/920 nm wavelength division multiplexers (3), a single cladding neodymium-doped gain optical fiber (4) and 920 nm optical fiber collimators (5); the space optical path part comprises a low-pass dichroscope (6), 920 nm 1/4 wave plates (7), 920 nm polarization beam splitter prisms (8), a 920 nm Faraday optical rotation device (9), 920 nm 1/2 wave plates (10) and a birefringence filtering piece (11). Mode locking potential of the neodymium-doped optical fiber is explored between 900 nm and 920 nm, on the premise that single pulse energy is guaranteed, light-light conversion efficiency is improved, and meanwhile the laser device provides a better light source facilitating integration for an integrated two-photon fluorescence microscope.

A high power inner cavity frequency multiplier laser includes a pump source, an optical couple system, a thermal-stable folding resonator composed of three total reflectors (1, 2 and 4) and an output mirror, a laser medium between reflectors 1 and 2 and a multiple crystal between the output mirror and the reflector 4 characterizing that the reflector 1 is a plane-convex lens, 2 is a plane-concave lens or a plane-plane lens, the output mirror and the reflector 4 are plane-concave lenses, the plane-convex total reflectors 1 and 4 are placed in normal incidence against the oscillation light and the lens 2 and output mirror 3 are placed in oblique incidence.

The present invention relates to a laser diode end-face pump solid laser, especially a Q adjusting method for a steady cavity/unsteady cavity of the laser diode end-face pump solid laser, including at least a pump source laser diode for forming a laser, a coupling system and a laser resonant cavity, the laser resonant cavity includes a laser crystal and an output mirror and is characterized in that a light output face of the output mirror is fixed with a piezoelectric ceramic device, the telescoping variation of the piezoelectric ceramic device is controlled by electrical signals to drive the output mirror to move right and left along an optical axis, when the length of the resonant cavity is smaller than the focal distance of a crystal thermal lens due to the telescoping variation, the laser resonant cavity emits laser, when the length of the resonant cavity is more than the focal distance of the crystal thermal lens due to the telescoping variation, the resonant cavity is in an unsteady state and the attrition of the resonant cavity is larger without laser output. The invention may simplify the structure of a Q adjusting laser, avoid the attrition and other badness effects due to the insertion of optical elements, and implement a high light-light translation efficiency.

The invention discloses a miniaturized human eye safety pulse laser. The pulse laser comprises a laser diode, a shaping coupling system, a resonant cavity, an optical window sheet and a shell; the laser diode emits pump light with the central wavelength of 940-980 nm, or 1.47 [mu]m, or 1.53 [mu]m, and the divergent pump light enters the resonant cavity after passing through the shaping coupling system; the shaping coupling system consists of two convex lenses and is used for realizing collimation and size adjustment of the pump light beam; the resonant cavity is used for generating pulse humaneye safety laser with the wavelength of 1.6 [mu]m; the optical window sheet is a laser-emitting window, and the surface of the window is plated with an antireflection film with the wave band of 1.6 [mu]m; and the shell is made of a metal material, and the laser diode, the shaping coupling system, the resonant cavity and the optical window sheet are all fixed on the shell. A new technical means for realizing high-peak-power and high-energy giant pulse output with low pumping power is adopted, and the whole laser is compact in design structure, stable, durable, miniature, convenient to carry and applicable to various scenes.

The invention discloses a green laser device which comprises a pumping source, a focusing lens, a self frequency multiplication laser crystal and a frequency multiplication crystal, wherein the pumping source, the focusing lens, the self frequency multiplication laser crystal and the frequency multiplication crystal are sequentially arranged. The laser transmitting faces of the self frequency multiplication laser crystal and the frequency multiplication crystal are plated with dielectric film. The contact faces of the self frequency multiplication laser crystal and the frequency multiplication crystal are fixed together. By means of the green laser device, the frequency multiplication crystal and the self frequency multiplication laser crystal are combined to jointly output green lasers. Under the low-temperature condition, the frequency multiplication crystal is mismatched, and the green lasers are output by the self frequency multiplication laser crystal; under the normal-temperature condition, the self frequency multiplication laser crystal serves as a laser crystal to generate fundamental frequency lasers, due to the fact that the frequency multiplication crystal has the larger nonlinear coefficient and the higher laser-laser conversion efficiency, frequency multiplication is carried out on the fundamental frequency lasers through the frequency multiplication crystal to generate the green lasers for outputting, and compared with a single self frequency multiplication crystal, the laser-laser conversion efficiency and the output power are greatly improved. The gluing technology is adopted for the self frequency multiplication laser crystal and the frequency multiplication crystal, the structure is compact, and the stability is good.

The invention discloses a resonant cavity shared cascading pump module and a laser. The pump module comprises a disc laser, a beam splitting system, a coupling system (7), a gain material and a reflection system (8) which are arranged in sequence along a direction of a light path. The disc laser comprises a pump light source, a cavity mirror (2) and an active gain mirror (1). The pump light source is used for pumping the active gain mirror (1), thereby generating laser. The laser is reflected by the beam splitting system, is coupled into the gain material through focusing of the coupling system and is reflected by the reflection system (8). The laser is returned according to the original light path. The beam splitting system is used for transmitting required laser and reflecting undesired laser. The invention also discloses the laser with the pump module. According to the resonant cavity shared cascading pump module, the laser generated in the cavity of the disc laser passes through a gain optical fiber repeatedly, so the pump light absorbed by the optical fiber is increased, and the light conversion efficiency is greatly improved.

The invention provides a neodymium glass regenerative amplifier, which comprises a regeneration cavity edge polarizing device, a quarter-wave plate, an electro-optical crystal and a first reflecting mirror which are sequentially arranged on a main optical path, and a regeneration cavity internal polarizing device, a neodymium glass rod and a second reflecting mirror which are sequentially arranged on an auxiliary optical path, wherein the regeneration cavity edge polarizing device is used for transmitting first-class polarized light and reflecting second-class polarized light; the quarter-wave plate is used for converting the first-class polarized light or the second-class polarized light into circularly polarized light; voltage applied to the electro-optical crystal is controlled, the electro-optical crystal is equivalent to a flat plate when no voltage is applied to the electro-optical crystal, and the electro-optical crystal is equivalent to a quarter-wave plate which quarter-wave voltage is applied to the electro-optical crystal; the regeneration cavity internal polarizing device is used for transmitting the first-class polarized light and transmitting the second-class polarized light, and the regeneration cavity internal polarizing device and the regeneration cavity edge polarizing device mutually receive the polarized light reflected by the opposite parties; and the neodymium glass rod is used for providing gain.

The invention relates to a double-pack optical fiber inactive Q-adjust laser, which comprises pump light source, optical fiber couple system, and resonance chamber. Wherein, the resonance chamber comprises front chamber mirror, double-pack yttrium-doping optical fiber, and Q adjuster; the input of optical fiber is contacted with front chamber mirror, while the outlet is contacted with Q adjuster; the couple system is between the pump light source and front chamber mirror. The invention has high increment, high light transform efficiency, low threshold value, and stable property.

A multi-pass total reflection laser amplification module includes a cuoid laser gain medium, an optical fiber coupling semiconductor pumping source, a seed source and a planar dichroscope. The multi-pass total reflection laser amplification module has advantages that the amplification module is small in size and the transmission optical path lengths of seed laser and pumping laser in the gain medium are comparatively large, so that the pumping light can be absorbed completely; the mode matching of the pumping light and the seed laser is comparatively good, so that the seed laser can be amplified completely and light-light conversion efficiency is high; at the same time; the thickness of the strip gain medium is small and the cooling area is large, so that the temperature gradient in the strip thickness direction is reduced. The multi-pass total reflection laser amplification module facilitates the realization of output of laser with high power and high optical quality.

The invention relates to an end face pump green-light laser which comprises a V-type folding cavity, a coupling and focusing system, a pump unit, a laser crystal, a frequency doubling crystal and a Q adjusting device. The end face pump green-light laser adopts a V-type folding optical circuit structure; basic frequency light produced by a resonant cavity is subjected to frequency doubling through the frequency doubling crystal in the cavity to produce frequency doubling light; and the frequency doubling light is output. The laser has reasonable design, novel conception, a normative process, a compact structure and no pollution, is suitable for industrialized batch production, and can be widely applied to communication, precise electron and other fields.

The invention discloses a compact direct coupling all-solid-state laser device which mainly comprises laser diode pump sources, a laser crystal, a heat sink and a semiconductor cooler, wherein end faces and side faces of the laser crystal are plated with film. The laser crystal and the semiconductor cooler are fixed on two sides of the heat sink respectively. The laser diode pump sources are laser diode linear array double-side-face symmetrical pumps, and are arranged on two sides of the laser crystal respectively. A first laser crystal face is plated with laser all-trans film, and is a resonant cavity reflector, a six laser crystal face is plated with laser partial transmission film, and is a laser output mirror, a second laser crystal face and a fifth laser crystal face are semi-cylindrical lenses, and are plated with pump light total transmission and laser all-trans film, and texturing processing is carried out on a third laser crystal face and a fourth laser crystal face. According to the compact direct coupling all-solid-state laser device, a cavity-mirror-crystal integrated design is formed, adjustment of a cavity mirror does not need to be carried out, the compact direct coupling all-solid-state laser device is stabler, and integration of the compact direct coupling all-solid-state laser device is convenient.

The invention discloses a preparation method and polarization equipment of a fan-shaped periodic optical superlattice polarization crystal. The preparation method comprises the following steps: S100,a first electrode structure and a second electrode structure are respectively manufactured on the + Z plane and the + Z plane of the superlattice crystal substrate, wherein the first electrode structure comprises a plurality of electrode lines, and the electrode lines are arranged on the + Z plane to form radial fan-shaped regions symmetrical about a Y axis; the second electrode structure comprises a plurality of electrode regions; S200, the electrode lines are divided according to an inclined included angle to form a plurality of sub-electrode line groups; S300, the polarization conditions ofeach sub-electrode line group are respectively controlled so as to polarize the superlattice crystal substrate, so that the fan-shaped periodic optical superlattice polarized crystal can be obtained.According to the preparation method, the fan-shaped periodic optical superlattice polarized crystal device with uniform duty ratio in the same period can be obtained, and the optical conversion efficiency of the device is greatly improved.

The method comprises: using a transparent medium made of second order nonlinear optic nano-crystal in size of 1-100nm as a display basis, and using infrared laser with two times of wavelength of its corresponding RGB tricolor visible light to scan the display basis, and using the computer to control the scan rate and the laser focus position, such that a 3D color image will be displayed in the transparent media.