44 results about "Lithium triborate" patented technology

The invention relates to a non-linear optical crystal of iodic acid zinc potassium. The iodic acid zinc potassium has a chemical formula of K2Zn(IO3)4(H2O)2 and the molecular weight of 864.74 and belongs to a monoclinic system; and the iodic acid zinc potassium has a space group C2 and unit-cell parameters are as follows: a is equal to 13.936 (6), b is equal to 7.7609(18), alpha and gamma are both equal to 90 degrees, beta is 126.75(3) degrees and Z is 1. The iodic acid zinc potassium is prepared by using a hydrothermal method. The iodic acid zinc potassium (K2Zn(IO3)4(H2O)2) has excellent non-linear optical performance and the powder second harmonic generation (SHG) coefficient of the iodic acid zinc potassium is 2.3 times that of KDP (KH2PO4) and is equivalent to that of LBO (lithium triborate).

The invention discloses a preparation method of a nonlinear crystal lithium triborate crystal surface high-laser-damaged-threshold antireflection film. Aiming at high LBO crystal anisotropy and the damage mechanism of the antireflection film, the method includes the steps that the surface of an LBO crystal is plated with a SiO2 film through an IAD process, and the film with which the surface of the LBO crystal is plated through the IAD process carries out plating through a sol-gel method. The LBO antireflection film prepared through the method has excellent optical properties, the high damage threshold and good environmental stability, and can be compatible with existing substrate machining, cleaning and film preparation processes. The preparation method has the beneficial effects of being high in process repeatability, high in controllability, easy to popularize and the like, and has wide application prospects in the field of high-power laser films in future.

The invention discloses a femtosecond ultraviolet laser. The femtosecond ultraviolet laser is composed of an optically connected seed source, a pulse broadener, an optical amplifier, a pulse compression module and a third frequency multiplication module. The seed source is an all-fiber passive mode-locked seed source or a solid mode-locked seed source; The pulse broadener is an all-optical fiber broadener or a spatial light broadener; The optical amplifier is an optically connected multi-stage optical amplifier; The pulse compression module is a prism pair or a grating pair or a chirped volumeBragg grating (CVBG); The frequency tripling module sequentially comprises a 1 / 2 wave plate, a polarization beam splitting prism, a convex lens, a concave lens, a frequency doubling crystal, a frequency tripling crystal, an absorbing block and an ultraviolet window plate. The second harmonic generation crystal is a kind of phase-matched lithium triborate (LBO) crystal, and the third harmonic generation crystal is a kind of phase-matched lithium triborate (LBO) crystal. The back surface of the third harmonic generation crystal is not coated and cuts the Brewster angle Theta B 1 of ultravioletlight, and the front surface of the second harmonic generation crystal is not coated and cuts the Brewster angle Theta B 2 of infrared light. The femtosecond ultraviolet laser realized according to the invention has simple and stable structure, long service life and is suitable for generating high-power femtosecond ultraviolet light.

The invention relates to nonlinear optical and ferroelectric crystals dimethylammonium germanium tetraborate, a preparation method and application thereof. A chemical formula of the crystals is [Ge(B4O9)].2CH3NH3; the molecular weight is 323.97; the crystals belong to a monoclinic system; the space group is C2; and unit cell parameters are that: a is 10.249(1), b is 9.449(1), alpha is equal to gamma which is 90 degrees, beta is 131.76(2) degrees, and Z is 2. The dimethylammonium germanium tetraborate is prepared by a solvothermal method. The dimethylammonium germanium tetraborate has excellent nonlinear optical and ferroelectric properties. The powder second harmonic generation (SHG) coefficient of the dimethylammonium germanium tetraborate is 2.0 times that of potassium dihydrogen phosphate (KDP) and is equivalent to that of lithium triborate (LBO). The remanent polarization strength is about 0.98mu C.cm<-2>, the coercive field is 22kV.cm<-1>, and the spontaneous polarization strength is 1.26mu C.cm<-2>.

A 473nm electro-optic q-switch laser comprises a local oscillator stage, an amplifier stage and an extracavity frequency doubling stage. A convex-concave cavity suitable for high-power laser output is adopted for a resonant cavity of the local oscillator stage, a double-end pulse pump is in bonding with a neodymium-doped yttrium aluminium garnet (Nd:YAG) crystal, an electro-optic q-switch generates 946nm fundamental frequency light, high-power 946nm laser is obtained through the amplifier stage, and 473nm blue light laser is generated by two lithium triborate (LBO) crystals placed in a cascade mode finally. The 473nm electro-optic q-switch laser has the advantages of being high in repetition frequency, narrow in pulse width, high in single pulse energy and good in light beam quality, and is suitable for underwater measurement of a high-precision laser radar.

A broad line red light generator is configured with a single mode (SM) pulsed ytterbium ('Yb') fiber laser pump source outputting pump light in a fundamental mode ('FM') at a pump wavelength which is selected from a 1030 - 1120 nm wavelength range. The disclosed generator further includes a SM fiber Raman converter spliced to an output of the Yb fiber laser pump source. The Raman converter induces an 'n' order frequency Stokes shift of the pump light to output the pump light at a Raman-shifted wavelength within 1220 and 1300 nm wavelength range with a broad spectral line of at least 10 nm. The disclosed light generator further has a single pass second harmonic generator ('SHG') with a lithium triborate ('LBO') nonlinear optical crystal having a spectral acceptance linewidth which is sufficient to cover the broad spectral line of the pump light. The SHG generates a SM pulsed broad-line red light with a broad spectral line of at least 4 nm.

The invention provides a cross-polarization dual laser for green wave band and relates to the field of lasers. The laser adopts a Yb:YCaO(BO3)3 crystal as a laser gain medium; a semiconductor laser or other light sources is / are taken as a pumping source; an LBO (lithium triborate) with the non-critical phase matching angle is taken as a frequency multiplication material; and the green wave band dual laser output is obtained by the frequency multiplied Yb:YCaO(BO3)3 crystal cross-polarization dual lasers generated in a cavity and out of the cavity.

The invention relates to the design and manufacturing of a compact laser chip, which utilizes a 1.06-um fundamental frequency laser of a laser crystal Nd: YVO4, and obtains 0.53-um frequency doubling green light through frequency doubling of nonlinear crystal PPLN (periodically poled lithium niobate). The chip comprises a laser crystal Nd: YVO4, a nonlinear crystal PPLN [or potassium titanyl oxygenic phosphate (KTP), lithium triborate (LBO), periodically poled potassium titanyl oxygenic phosphate (PPKTP), periodically poled lithium tantalite (PPLT) and the like), heat sink Si or AIN, and a resonant cavity consisting of optical films plated on the surfaces of two crystals. The compact laser chip is characterized in that the laser crystal and the nonlinear crystal are welded (or glued) on the heat sinking through welding flux (glue) under the situation that two cavity surfaces are ensured to be parallel. The laser chip structure has a simple structural design, small volume, low cost, and convenience in mass production; and when the compact laser chip is used, a suitable semiconductor pumping source is matched so that the green light with specific wavelength can be output, and the compact laser chip is expected to be widely applied in laser display.

Provided is a mixed positive electrode active material comprising a large-grain positive electrode active material with an average diameter of 10 μm or greater and a small-grain positive electrode active material with an average diameter of 5 μm or smaller, in which the large-grain positive electrode active material and the small-grain positive electrode active material are coated with different materials between lithium triborate and metal oxide, respectively.

The invention provides a Raman spectral liquid detection method based on laser frequency doubling and hollow-core optical fibers. The method adopts a continuous laser device with the wavelength of 915 nm or 976 nm as a light source and adopts a laser resonant cavity composed of a first optical fiber Bragg grating and a second optical fiber Bragg grating, and furthermore, a narrow-line-width 532 nm laser is obtained through an active optical fiber and a lithium triborate frequency doubling crystal and a to-be-detected liquid is stimulated to generate Raman scattering light; at the same time, the liquid detection method also has the advantages of wide application range, high measuring efficiency, high reliability and the like.

The invention provides a Raman spectrum liquid detection method based on a linear intracavity frequency doubling and hollow-core fiber. According to the method, a continuous laser device with the wavelength of 915 nanometers or 976 nanometers is used as a light source and an annular laser resonant cavity is adopted, 532 nanometer laser with narrow linewidth is further obtained through an active fiber and a lithium boric oxide frequency doubling crystal, and liquid to be detected is stimulated to generate Raman scattering light; meanwhile, the liquid detection method provided by the invention has the advantages of few longitudinal modes, good coherence, compact structure, high frequency doubling efficiency, high reliability and the like.

The invention relates to a growing device of a lithium triborate (LBO) crystal. The growing device comprises a crucible and a convex part which is arranged on the inner bottom of the crucible. The invention also relates to a growing method of the LBO crystal. Growth of the LBO crystal is carried out by adopting the growing device. The growing device provided by the invention is simple in structure, simple and convenient to manufacture, and low in cost. By adopting the growing device and the growing method provided by the invention, large-caliber flat LBO single crystal can be directly grown, the cutting difficulty of a crystal apparatus is reduced, the utilization rate of the crystal is obviously improved, the processing link is reduced, the growth period of the crystal is shortened, and the manufacturing cost is reduced.

The invention provides a Raman spectrum liquid detection method based on laser frequency doubling and dual hollow-core fibers. A continuous laser with the wavelength of 915 or 976 nanometers is used as a light source, a laser resonant cavity comprising a first fiber Bragg grating and a second fiber Bragg grating is used, narrow-line-width 532 nanometer laser is further acquired by an active fiber and lithium triborate frequency doubling crystals, and reference liquid and liquid to be detected in the dual hollow-core fibers are respectively excited to generate Raman scattering light. Besides, the liquid detection method has the advantages of less longitudinal modes, good coherence, high measuring efficiency, high reliability and the like.

The invention discloses a preparation method of a nonlinear crystal lithium triborate crystal surface high-laser-damaged-threshold antireflection film. Aiming at high LBO crystal anisotropy and the damage mechanism of the antireflection film, the method includes the steps that the surface of an LBO crystal is plated with a SiO2 film through an IAD process, and the film with which the surface of the LBO crystal is plated through the IAD process carries out plating through a sol-gel method. The LBO antireflection film prepared through the method has excellent optical properties, the high damage threshold and good environmental stability, and can be compatible with existing substrate machining, cleaning and film preparation processes. The preparation method has the beneficial effects of being high in process repeatability, high in controllability, easy to popularize and the like, and has wide application prospects in the field of high-power laser films in future.