CN1621575A - Neodymium-doped strontium-yttrium borate laser crystal - Google Patents
Neodymium-doped strontium-yttrium borate laser crystal Download PDFInfo
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Abstract
The present invention relates to artificial crystal, and is especially Nd:Sr3Y2(BO3)4 crystal as one kind of laser crystal material and its preparation process. The Nd:Sr3Y2(BO3)4 crystal is prepared through Czochrolski method with growth temperature of 1313-1358 deg.c, drawing speed of 0.5-2 mm/hr, and crystal rotation speed of 15-30 rpm. The present invention can grow Nd:Sr3Y2(BO3)4 crystal with high quality and great size. The Nd:Sr3Y2(BO3)4 crystal is used as laser matter in solid laser and is pumped with flash lamp or laser diode to produce laser output of 1060 nm wavelength. The laser with the Nd:Sr3Y2(BO3)4 crystal may be used in spectroscopy, biomedicine and other fields.
Description
The invention relates to the field of artificial crystals and crystal growth in the technical field of photoelectron functional materials, in particular to a laser crystal material of a working substance in a solid-state laser.
Background art a laser crystal is a working substance of a solid laser, which refers to a luminescent material that takes a crystal as a substrate, absorbs pump light energy through a discrete luminescent center and converts the pump light energy into laser output. Various physical and chemical properties of the laser crystal are mainly determined by the host material, and spectral characteristics, fluorescence lifetime, and the like are determined by the energy level structure of the active ion. Since the successful development of artificial ruby pulsed lasers in 1960, hundreds of laser crystals have been discovered so far, but for various reasons, only ten laser crystals are really available for practical use.
Currently, the most widely used laser crystal is a neodymium ion doped Yttrium Aluminum Garnet (YAG) crystal, which has various better physical and chemical properties and is easy to grow high optical quality and large-size high-quality crystals. However, it has the disadvantage of narrow absorption line, and is not suitable for pumping by LD, which will be the development direction of laser pumping source in future.
The active search for a high-quality laser crystal material with excellent physical, chemical and mechanical properties and high optical quality and large size, which is suitable for LD pumping, is currently ongoing work of scientists in various countries. Neodymium ions are widely used as active ions due to their superior spectral properties; borate is also a popular choice for laser-based materials due to its good physicochemical and mechanical properties.
The invention aims to develop a novel neodymium-doped yttrium strontium borate Nd: Sr laser crystal3Y2(BO3)4It can directly use flash lamp and LD pump, and is a laser crystal material with higher conversion efficiency. Nd: Sr3Y2(BO3)4The crystal belongs to an orthorhombic system and has a Pnma space group structure. The neodymium ion is used as a doping ion to replace the lattice position of the yttrium ion, the doping concentration of the neodymium is between 0.5 at% and 15 at%, the fluorescence lifetime (tau) is 71.3-45.2 mu s, the fluorescence lifetime is a function of the concentration of the neodymium ion, and the neodymium ions with different concentrations can be doped according to different requirements. The experimental result shows that the laser crystal can output laser with the wavelength of 1060nm and can be used as a laser crystal.
Nd:Sr3Y2(BO3)4The crystal is a molten compound with the same components, and can be grown by a pulling methodThe chemical reaction formula is as follows: are weighed, mixed and tabletted in the proportions of (D) and (D)2O3Then adding the raw materials according to the required concentration, wherein the raw materials are as follows: nd (neodymium)2O3(purity 99.95%, institute of chemistry for Catharanthus of the Chinese academy of sciences), Y2O3(purity 99.99%, institute of applied chemistry of Catharanthus of Chinese academy of sciences), SrCO3(purity 99.95%, Shanghai chemical reagent Co., Ltd., China pharmaceutical group), H3BO3(purity 99.99%, Beijing chemical plant), platinum crucible is used for growth in inert gas (such as N)2Ar, etc.) under the atmosphere, the parameters of crystal growth are that the growth temperature is about 1313-1358 ℃, the pulling speed is 0.5-2 mm/h, the crystal rotating speed is 15-30 rmp, and high-quality Nd and Sr are grown3Y2(BO3)4And (4) crystals.
Sr is added into the Nd to be grown3Y2(BO3)4The crystal was collected on a four-circle diffractometer and structural analysis showed that it belongs to the orthorhombic system, space group Pnma, unit cell parameters a-8.70167 Å, b-15.96203 Å, c-7.39176 Å and V-1026.69 Å3And Z is 4, and the refractive index is 1.74 by oil immersion.
Sr is added into the Nd to be grown3Y2(BO3)4The crystal is analyzed and tested for absorption spectrum, fluorescence spectrum and fluorescence life, and the result shows that (5 at% Nd is doped)3+Sr of3Y2(BO3)4Crystal as an example): nd: Sr3Y2(BO3)4The main absorption peak of the crystal is 807nm, its half-peak width is 15nm, and its absorption transition cross-section is 6.36X 10-20cm2The larger half-peak width at 807nm is very suitable for pumping by adopting AsGaAl semiconductor laser, which is beneficial to the absorption of the laser crystal to the pump light and improves the pumping efficiency. Its emission transition cross section sigma at 1060nmemIs 1.07X 10-19cm2The full width at half maximum (FWHM) is 30.2nm, and the fluorescence lifetime is 51.7 mus, because crystals with long fluorescence lifetime can accumulate more particles at the upper energy level, the energy storage is increased, and the improvement of the output power and the output energy of the device is facilitated. Accordingly, Nd: Sr3Y2(BO3)4The crystal can obtain larger output, and is a laser crystal with high conversion efficiency, low cost, high optical quality and practical application prospect and use value.
Nd:Sr3Y2(BO3)4The crystal can be very easily grown into a crystal with excellent quality by a Czochralski method, has high growth speed, hard texture, good heat-conducting property and excellent optical characteristics, can be easily pumped by a flash lamp and an LD to obtain laser output with the laser output wavelength of 1060nm, and can be used as a better laser crystal. The solid laser made of the crystal is used in the fields of spectroscopy, biomedicine, military and the like.
Nd: Sr of the invention3Y2(BO3)4The crystal is a molten compound with the same components, can be grown by adopting a pulling method, has short growth period and can obtain high-quality large-size crystals. In the experimental process, a proper solid-phase synthesis method and a better growth condition are found, and crystals with high optical quality and the size of phi 24.6mm multiplied by 56mm are grown by adopting a pulling method.
The preferred modes of carrying out the invention are as follows:
example 1: nd with doping concentration of 2.0 at.% for Czochralski growth3+Nd of3Y2(BO3)4And (3) laser crystals.
Accurately weighing SrCO according to the proportion3、Y2O3、H3BO3、Nd2O3Mixing, grinding, tabletting, and adding 60 × 40mm3The platinum crucible of (2) was subjected to a solid-phase reaction in a muffle furnace at 900 ℃ for 12 hours, and then heated to 1020 ℃ for 10 hours. Putting the synthesized sample into a pulling furnace, and adopting a pulling method in N2In the atmosphere, the growth temperature is 1313 ℃, the crystal rotation speed is 10rmp, and the pulling speed is 1mm/h, the growth size is 30 multiplied by 28 multiplied by 20mm3High quality Nd3+Content of 2.0 at%Nd of3Y2(BO3)4And (4) crystals.
Example 2: nd with doping concentration of 5.0 at.% for Czochralski growth3+Nd of3Y2(BO3)4And (3) laser crystals.
Accurately weighing SrCO according to the proportion3、Y2O3、H3BO3、Nd2O3Mixing, grinding, tabletting, and adding 60 × 40mm3The platinum crucible of (2) was subjected to solid-phase reaction in a muffle furnace at 950 ℃ for 10 hours, and then heated to 1050 ℃ for 8 hours. Putting the synthesized sample into a pulling furnace, and growing the crystal with the size of 27 multiplied by 25 multiplied by 23mm by adopting a pulling method under the conditions that the growth temperature is 1330 ℃, the crystal rotating speed is 5rmp and the pulling speed is 0.7mm/h in Ar atmosphere3High quality Nd3+Sr and Nd in the content of 5.0 at%3Y2(BO3)4And (4) crystals.
Claims (5)
1. A neodymium-doped strontium yttrium borate laser crystal is characterized in that: the molecular formula of the crystal is Nd: Sr3Y2(BO3)4Belongs to an orthorhombic system, the space group is Pnma, the unit cell parameters are a-8.70167 Å, b-15.96203 Å, c-7.39176 Å and V-1026.69 Å3And Z is 4, and the refractive index is 1.74.
2. The neodymium-doped strontium yttrium borate laser crystal of claim 1, wherein: in the crystal, Nd3+Ion as doping ion to replace Y in crystal3+The doping concentration of the lattice sites of the ions is 0.5 at% to 15 at%.
3. A method of preparing a neodymium-doped strontium yttrium borate laser crystal according to claim 1, characterized in that: the crystal is grown by adopting a pulling method, the growth temperature of the crystal is 1313-1358 ℃, the pulling speed is 0.5-2 mm/h, and the crystal rotating speed is 15-30 rmp.
4. Use of a neodymium-doped strontium yttrium borate laser crystal according to claim 1, characterized in that: the crystal is used as a laser working substance in a solid laser, and a flash lamp or a Laser Diode (LD) is used as a pumping source to excite and generate laser output with the wavelength of 1060 nm.
5. Use of a neodymium-doped strontium yttrium borate laser crystal according to claim 1, characterized in that: the solid laser made of the crystal is used in the fields of spectroscopy, biomedicine, military and the like.
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| CNB2003101166754A CN100368602C (en) | 2003-11-26 | 2003-11-26 | Neodymium-doped strontium-yttrium borate laser crystal |
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| CNB2003101166754A CN100368602C (en) | 2003-11-26 | 2003-11-26 | Neodymium-doped strontium-yttrium borate laser crystal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102965730A (en) * | 2011-09-01 | 2013-03-13 | 中国科学院福建物质结构研究所 | Novel ytterbium-activating-gadolinium calcium borate ultrafast laser crystal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102965730A (en) * | 2011-09-01 | 2013-03-13 | 中国科学院福建物质结构研究所 | Novel ytterbium-activating-gadolinium calcium borate ultrafast laser crystal |
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