37results about How to "Stable growth process" patented technology

The invention provides a chromium-doped potassium scandium tungstate tunable laser crystal. 60-90at% of K2W2O7 serves as a fluxing agent, the cooling rate is 1-5DEG C/day, and the revolving speed is 5-30turns/minute. The Cr<3+>: KSc(WO4)3 crystal with high quality and bigger size grows. The crystal belongs to a trigonal system and has a space group structure. The crystal can serve as the tunable laser crystal of which the tunable range is 750-1200nm, and the solid crystal made of the crystal can be used for various fields, such as spectroscopy, biomedicine and military.

The invention provides a Cr<3+>:KMgSc(WO4)3 doped tunable laser crystal and a method for the crystal. The crystal belongs to the trigonal system and has the space group as descried in the description and the following cell parameters: a=9.493A, C=24.545A, V=1915.68A<3>, Z=6 and Dc=4.412g/cm<3>. The crystal can be grown by using flux growth method, wherein the 60-80at% K2W2O7 is used as flux, the temperature decreasing speed is 1-5 DEG C per day, and the rotating speed is 5-30rpm. The high-quality large-size Cr<3+>:KMgSc(WO4)3 crystal has the tunable range of 710-1300nm and is expected to become a novel tunable laser crystal for practical application.

In this invention, C20chralski method is used for the growth of neodymium doped lithium lanthanum barium tungstate laser crystal. The growth conditions are: growth temperature 1410 deg.C, crystal rotation rate 15-20 r.p.m, pulling speed 1.5-3 mm/h. This crystal is of cubic crystal, space group being of Fm3m, single cell parameter a=0.859 angstrom, Z=4, single cell volum V=523.41 cubic angstrom. This invented crystal is a novel kind of laser crystal, it can produce laser output at about 1.06 micron wave length, and being prospected to be real utilization.

The crystal of Nd3+:Ca2La0.67(VO4)2 and the preparation method are provided in the invention. It gets the crystal in the condition of 1600deg.C, 15-25 r/min and 1.0-2.0mm/h of pulling speed. The spectrum indicates that: the crystal has big emission transition section in the wavelength of 1064nm and 880nm to generate the 1064nm and 880nm laser. The 880nm laser can generate the blue laser of 435-460nm after nonlinear optical crystal frequency doubling.

The present invention relates to neodymium doped lithium lanthanum tungstate laser crystal and its preparation process, and relates to artificial crystal. In the Czochralski process at 1065 deg.c, the crystal rotated at 10-35 rpm grows in drawing speed of 0.5-0.6 mm/hr. The crystal is tetragonal one and has space group of 14(1)/a(C4h6), density of 3.152 g/cu cm and refractive index of 2.0. The crystal has one strong absorption peak at 805 nm with absorption cross section of 1.88E(-20) sq cm and hemi-peak width of 18 nm; is suitable for being pumped with laser diode; has strong fluorescent emitting peak at 1062 nm, emitting transition cross section of 21.7E(-20) sq cm, is easy to generate 1062 nm laser output, and expects to obtain practical use.

The invention relates to the field of artificial lenses, in particular to a self-frequency-doubling laser neodymium-doped BaCaBO3F crystal. According to the invention, the Nd3<+>: BaCaBO3F crystal with high quality and larger size can grow by adopting a Czochralski method and at a temperature about 1096 DEG C, a crystal rotating speed of 10-30rpm and a pulling speed of 0.5-2.0mm/h. The Nd3<+>: BaCaBO3F crystal is a novel laser crystal and can generate laser output with wavelengths about 1068bn and 940nm. Meanwhile, because the crystal has a nonlinear optical effect, 534nm green light output and 470nm blue light output can be obtained by self-frequency-doubling. Lasers manufactured by utilizing the crystal disclosed by the invention can be used in the multiple fields, such as spectroscopy, biomedicine, military and the like.

The invention discloses an air filter material. The air filter material comprises a base material, a crystal nucleus inlaid on the surface of the base material and a nano zinc oxide crystal rod growing on the crystal nucleus, wherein the base material is melt-blow non-woven cloth, the crystal nucleus is made of nano tourmaline and consists of a hydrophilic hemisphere and an oleophylic hemisphere, the oleophylic hemisphere is inlaid into the base material, and the hydrophilic hemisphere is exposed on the surface of the base material. The invention also relates to a preparation method and application of the air filter material. According to the invention, the air filter material has the advantages of low resistance, high filter efficiency, good purifying effect and good market prospect.

The invention provides a chromium-doped calcium aluminum niobate tunable laser crystal. The chemical formula of the crystal material is: Cr<3+>:Ca2AlNbO6. The crystal belongs to monoclinic system andhas a P21/c space group structure, and has the following cell parameters: a=5.378angstrom, b=5.4154angstrom, c=7.6248angstrom, beta=89.970(2)degree, and Z=2. The invention also provides a preparationmethod of the above-mentioned tunable laser crystal. The method includes: adopting CaCO3, Al2O3, Nb2O5 and Cr2O3 as the initial raw materials, conducting solid-phase synthesis and double sintering toprepare Cr<3+>:Ca2AlNbO6 raw material, and subjecting the Cr<3+>:Ca2AlNbO6 raw material to czochralski growth into a large size and high optical quality crystal. The crystal provided by the inventioncan be used as a tunable laser crystal, and the tunable range is 600-1000nm.

The invention discloses a self-activation laser crystal scandium-strontium-ytterbium borate (YbSr6Sc(BO3)6) and preparation method, wherein a Czochralski method and a molten salt growth method are employed to grow YbSr6Sc(BO3)6 crystal with high quality and rather large scale, the crystal belongs to R3 space group, and the density is 4.48g/cm3. Optical spectrum and calculation show that, it is easy for the crystal to produce broadband laser output having a wavelength around 1020 nm. The solid-state laser made by the crystal can be applied into the fields of optical spectroscopy, biological medicine and military purpose.

The invention provides tunable laser crystal chrome-doped sodium magnesium molybdate and a preparation method thereof. A molten salt top seed crystal method is adopted, 55-80at.% of Na2Mo2O7 is used as a melting assistant, and the growth parameters are as follows: the cooling velocity is 0.5-3 DEG C/day, the growth temperature is 800-880 DEG C, the rotation speed is 5-30rpm/minute, and a Cr<3+>:Na2Mg5(MoO4)6 crystal which is relatively good in quality and relatively large in size is grown, wherein the doping concentration of Cr<3+> is 0.2-5at.%. The crystal belongs to a triclinic system, and has a P-1 space group structure as shown in the specification. The crystal has the characteristics that the mechanical property is moderate, the tunable laser wave band is wide, the emission cross section is large, and the like, and is a relatively good tunable laser crystal material.