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Neodymium-doped lanthanum strontium aluminate tantalate laser crystal and process for preparing the same

A laser crystal, tantalic acid technology, used in crystal growth, chemical instruments and methods, single crystal growth, etc., to achieve the effects of large absorption and emission cross-section, good optical quality, and long fluorescence lifetime

Inactive Publication Date: 2007-10-03
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, Nd-doped aluminum strontium lanthanum tantalate crystals (Nd 3+ :(La,Sr)(Al,Ta)O 3 ) as a laser gain medium has not been reported yet

Method used

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  • Neodymium-doped lanthanum strontium aluminate tantalate laser crystal and process for preparing the same
  • Neodymium-doped lanthanum strontium aluminate tantalate laser crystal and process for preparing the same

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Embodiment 1

[0023] The preparation method of the Nd-doped lanthanum strontium aluminum tantalate laser crystal of the present invention comprises the following steps:

[0024] ① Select the value of x, according to the molecular formula (Nd x La (0.3-x) Sr 0.7 )(Al 0.65 Ta 0.35 )O 3 Weigh the raw materials according to the stoichiometric ratio, the initial raw materials are: La 2 o 3 , SrCO 3 , Al 2 o 3 , Ta 2 o 5 and Nd 2 o 3 , the chemical reaction equation of the preparation process is as follows:

[0025] (0.3-x) La 2 o 3 +1.4SrCO 3 +0.65Al 2 o 3 +0.35Ta 2 o 5 +xNd 2 o 3

[0026] →2(Nd x La (0.3-x) Sr 0.7 )(Al 0.65 Ta 0.35 )O 3 +1.4CO2 ;

[0027] ②Mix the weighed raw materials evenly, press into tablets, put them in an alumina crucible, put them in a muffle furnace, and sinter at a constant temperature of 1200°C for more than ten hours;

[0028] ③The sintered Nd:(La,Sr)(Al,Ta)O 3 Put it into an iridium crucible, under the protection of inert gas, use (La...

Embodiment 2

[0032] Get x=0.1at.% in the raw material proportioning of present embodiment. La 2 o 3 (4N), SrCO 3 (4N), Al 2 o 3 (5N), Ta 2 o 5 (5N) and Nd 2 o 3 (5N) The high-purity raw material oxide powder is properly pre-dried in the air, then weighed strictly according to the stoichiometric ratio, mixed well, and pressurized into a block with a diameter slightly smaller than the inner diameter of the crucible. After pre-firing at high temperature for 15 hours, put it into an iridium crucible and start growing crystals. The crystal growth direction is , the crystal growth rate and crystal rotation rate are 2mm / h and 10rpm respectively, and the growth atmosphere is N 2 Protective atmosphere. The initial solid-liquid interface growth line is convex to the melt, so the faults and impurities are reduced, and the growth boundary line becomes flat later. In order to prevent crystal cracking, the temperature was lowered to room temperature at a rate of 100 °C / h after the growth. A ...

Embodiment 3

[0034] Get x=10at.% in the raw material proportioning of the present embodiment. La 2 o 3 (4N), SrCO 3 (4N), Al 2 o 3 (5N), Ta 2 o 5 (5N) and Nd 2 o 3 (5N) The high-purity raw material oxide powder is properly pre-dried in the air, then weighed strictly according to the stoichiometric ratio, mixed well, and pressurized into a block with a diameter slightly smaller than the inner diameter of the crucible. After pre-firing at high temperature for 20 hours, put it into an iridium crucible and start growing crystals. The crystal growth direction is , the crystal growth rate and crystal rotation rate are 1mm / h and 10rpm, respectively, and the growth atmosphere is Ar protective atmosphere. The initial solid-liquid interface growth line is convex to the melt, so the faults and impurities are reduced, and the growth boundary line becomes flat later. In order to prevent crystal cracking, the temperature was lowered to room temperature at a rate of 30 °C / h after the growth. A...

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Abstract

Disclosed is a neodymium-doped lanthanum strontium aluminate tantalate laser crystal and process for preparation, wherein the crystal has a structural formula of (NdxLa(0.3-x)Sr0.7)(Al0.65Ta0.35)O3, wherein the value range of x is between 0.1-10 at%, the preparation method of the crystal comprises the following steps: (1) weighing raw materials of La2O3, SrCO3, Al2O3, Ta205 and Nd203 according to the molecular formula and chemical measurement, (2) mixing the raw material homogeneously, tabletting and placing aluminium oxide crucible into a Muffle furnace, sintering more than ten hours at 1200 deg C, (3) loading the sintered Nd:(La,Sr)(Al,Ta)O3 into a iraurite crucible, using (La,Sr)(Al,Ta)O3 single crystal as seed crystal, growing with intermediate frequency induction Czochralski method in inert gas atmosphere.

Description

technical field [0001] The present invention relates to crystal growth, especially a kind of laser crystal material of laser working substance, doped with neodymium aluminum tantalate lanthanum strontium Nd 3+ :(La,Sr)(Al,Ta)O 3 Laser crystal and its preparation method. Background technique [0002] In 1960, Maiman made the first ruby ​​pulse laser, which marked the birth of laser technology. Since then, laser technology has developed very rapidly. The all-solid-state laser with artificial crystal material as the matrix and semiconductor laser as the pump source has been widely used in military, industrial, medical and other fields due to its advantages of small size, high efficiency, long life and good beam quality. As a gain medium in a solid-state laser, a series of basic requirements must be met: first, the doping of active ions into the host material must have an energy level structure suitable for generating stimulated radiation; second, the host material must have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/30C30B15/00
Inventor 杭寅朱月芹张连翰宋词
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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