31 results about "Yttrium lithium fluoride" patented technology

The invention discloses a growth device, a growth furnace and a preparation method of yttrium lithium fluoride laser crystals, belonging to the field of laser crystals; the growth device comprises a crucible, a thermal insulation cylinder, a copper induction heating coil and a seed crystal rod, wherein the thermal insulation cylinder is arranged outside the crucible; the copper induction heating coil is arranged outside the thermal insulation cylinder; the seed crystal rod passes through the top of the thermal insulation cylinder and stretches into the crucible; a first circular hole having the diameter of 60-120mm and used for passing through the seed crystal rod is arranged in the middle at the top of the thermal insulation cylinder; the crucible is a platinum crucible or an iridium crucible; a nickel layer or a high-temperature resistant resin layer is formed on the outside surface of the copper induction heating coil in a spraying manner; and therefore, corrosion of fluoride gas can be avoided. The preparation method of the yttrium lithium fluoride laser crystals is disclosed on the basis of the growth furnace and the growth device of the yttrium lithium fluoride laser crystals. By adopting the induction heating manner, floats are salvaged in a manner of replacing seed crystals; and therefore, steady growth of high-quality yttrium lithium fluoride laser crystals is realized.

The invention discloses an Er<3+> / Yb<3+> co-doped yttrium lithium fluoride monocrystal and a preparation method thereof. The yttrium lithium fluoride monocrystal is a rare earth ion Er<3+> / Yb<3+> co-doped monocrystal; the molecular formula is LiY(1-x-y)ErxYbyF4, wherein x is greater than or equal to 0.008 and less than or equal to 0.085, and y is greater than or equal to 0.002 and less than or equal to 0.170; the segregation coefficients of Yb<3+> and Er<3+> in the yttrium lithium fluoride are about 1, and efficient intermediate infrared laser of 2.7 microns can be output; and the yttrium lithium fluoride monocrystal has high transmittance of intermediate infrared laser, has better thermal, mechanical and chemical stabilities than those of glass state materials and has the characteristics of low phonon energy, high optical transmittance of wavebands with width of 300-5500nm, less color center forming amount, low thermal lens effect and the like, thereby being more easily processed and more suitably used in laser devices. In the preparation method disclosed by the invention, a sealing crucible falling technology is used, so that the operation is simple; the raw material is fluorated at high temperature in a sealed water-free and oxygen-free environment, so that the crystal is isolated from air and water vapor during the growth; and therefore, the high-quality Er<3+> / Yb<3+> co-doped LiYF4 monocrystal containing little OH<-> ion and oxide is obtained.

The invention discloses an Er<3+> / Pr<3+> co-doped yttrium lithium fluoride monocrystal and a preparation method thereof. The yttrium lithium fluoride monocrystal is a rare earth ion Er<3+> / Pr<3+> co-doped monocrystal; and the molecular formula is LiY(1-x-y)ErxPryF4, wherein x is greater than or equal to 0.010 and less than or equal to 0.085, and y is greater than or equal to 0.0001 and less than or equal to 0.008. The yttrium lithium fluoride monocrystal has the advantages of high emission efficiency of fluorescence of 2.7 microns and high transmittance in intermediate infrared ray, has better thermal, mechanical and chemical stabilities than those of glass state materials and has the characteristics of low phonon energy, high optical transmittance of wavebands with width of 300-5500nm, less color center forming amount, low thermal lens effect and the like, thereby being more easily processed and more suitably used in laser devices. In the preparation method disclosed by the invention, a sealing crucible falling technology is used, so that the operation is simple; the raw material is fluorated at high temperature in a sealed water-free and oxygen-free environment, so that the crystal is isolated from air and water vapor during the growth; and therefore, the high-quality Er<3+> / Pr<3+> co-doped LiYF4 monocrystal containing little OH<-> ion and oxide is obtained.

A 696nm red light total-solid laser of Blu-ray pump praseodymium-doped yttrium lithium fluoride relates to a total-solid laser. The 696nm red light total-solid laser of Blu-ray pump praseodymium-doped yttrium lithium fluoride is provided with a 444nm Blu-ray semiconductor laser, a plastic prism, a focusing lens, a plane input mirror, Pr: yttrium lithium fluoride (YLF) laser crystal, barium boron oxide (BBO) birefringent crystal, a laser output mirror and a Blu-ray optical filter; wherein the 444nm Blu-ray semiconductor laser serves as a pump source of the 696nm red light total-solid laser, the plastic prism is arranged at an output end of the 444nm Blu-ray semiconductor laser, the focusing lens is arranged at an output end of the plastic prism, the plane input mirror is arranged at an output end of the focusing lens and serves an input mirror of 696nm red light, an input end face of the Pr: YLF laser crystal is next to the plane input mirror; the BBO birefringent crystal is arranged at an output end of the Pr: YLF laser crystal, the laser ouput mirror is arranged at an output end of the BBO crystal and serves as an output mirror of the 696nm red light laser, and the Blu-ray optical filter is arranged at an output end of the laser output mirror and used for filtering Blu-ray.

The invention discloses a Ho<3+> / Pr<3+> codoping lithium yttrium fluoride monocrystal and a preparation method thereof. The lithium yttrium fluoride monocrystal is a rare-earth iron Ho<3+> / Pr<3+> codoping monocrystal; the molecular formula of the lithium yttrium fluoride monocrystal is LiY(1-x-y)HoxPryF4, wherein x is more than and equal to 0.004 or less than and equal to 0.08, and y is more than and equal to 0.0002 or less than and equal to 0.01. The lithium yttrium fluoride monocrystal disclosed by the invention has the characteristics of high efficiency of 2.9 mu m fluorescence emission, high intermediate-infrared transmittance, more excellent thermotic, mechanical and chemical stability compared with those of a glass-state material, low phonon energy, high optical transmissibility at a 300-5500 nanometer broadband, small color center forming amount, low thermal lens effect, and the like, and is easier to process and more suitable for a laser device. The preparation method disclosed by the invention adopts a sealing crucible descent method technology, is easy to operate, carries out high-temperature fluorination treatment on a raw material and obtains the high-quality Ho<3+> / Pr<3+> codoping LiYF4 monocrystal almost without -OH ions or oxides by insulating the monocrystal from air and vapors in the growing process by adopting a water-insulated oxygen-insulated sealing environment.

The invention discloses an yttrium lithium fluoride composite crystal and a preparation method thereof, and belongs to the technical field of laser crystal preparation. According to the method, an yttrium lithium fluoride crystal on a c-axis crystal orientation is pre-boned at the end part of a doped yttrium lithium fluoride crystal on an a-axis crystal orientation with a direct bonding technology, and a first intermediate product is obtained; the intermediate product is subjected to pressure treatment in the direction perpendicular to the bonding surface of the first intermediate product, and a second intermediate product is obtained; and finally, under the vacuum condition, the second intermediate product is subjected to hot isostatic pressure treatment, and the yttrium lithium fluoride composite crystal is obtained. The prepared yttrium lithium fluoride composite crystal doesn't have the axial matching problem and has a low heat effect, thermally induced depolarization loss of the crystal is reduced, and the output power and the beam quality of a laser are improved.

A polygonal crystal for a solid laser comprises a laser crystal 1 and bonded crystals 2 located at both ends of the laser crystal 1, wherein the laser crystal 1 and the bonded crystals 2 have regularly pentagonal cross sections; the laser crystal 1 uses one of a neodymium-doped yttrium lithium fluoride crystal, a thulium-doped yttrium lithium fluoride crystal, a thulium-holmium-codoped yttrium lithium fluoride crystal, and a holmium-doped yttrium lithium fluoride crystal; the bonded crystals 2 are yttrium lithium fluoride crystals. The polygonal crystal and an all-solid-state laser of the invention use the regularly pentagonal laser crystal and the bonded crystals made of the yttrium lithium fluoride material, suppress the generation of self-oscillation in the crystal to the utmost extentby using side pumping, and realize high-energy high-efficiency laser output.

The invention relates to an erbium-doped gadolinium lithium fluoride crystal and a growth method thereof, belonging to the technical field of optoelectronic materials. The conventional erbium-doped yttrium lithium fluoride crystal has low doping concentration for the reasons of ionic radius matching; and in the growth process of the conventional erbium-doped yttrium lithium fluoride crystal, the crystal with large size is difficult to grow as the yttrium lithium fluoride has high melting point and the raw material has high volatility. The erbium-doped gadolinium lithium fluoride crystal belongs to a tetragonal crystal system and takes rare earth erbium as an activated ion, wherein the erbium-doped gadolinium lithium fluoride crystal has a molecular formula of Er: LiGdF4, and the crystal matrix is gadolinium lithium fluoride. The growth method of the erbium-doped gadolinium lithium fluoride crystal is characterized in that LiF is excessively added according to LiF: GdF3=16.5 to 17:7.76to 8, and the crystal growth process parameters are determined as: the pulling speed is 0.3 to 0.8mm / h, the rotation speed is 3 to 10rpm, and the growth temperature is 745 to 755 DEG C. The erbium-doped gadolinium lithium fluoride crystal is a laser crystal and is suitable for a high-power solid laser.