Yb-dopped strontium-lanthanum aluminate-tantalate laser crystal and its prepn
A technology of laser crystal and tantalum acid, which is applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problems that the research of laser gain medium has not been reported yet.
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Embodiment 1
[0024] The preparation method of the ytterbium-doped aluminum lanthanum strontium tantalate laser crystal of the present invention comprises the following steps:
[0025] ①Select the value of x, according to the molecular formula (Yb x La (0.3-x Sr 0.7 )(Al 0.65 Ta 0.35 )O 3 The raw materials are weighed according to the stoichiometric ratio, and the initial raw materials in the crystal growth recipe are:
[0026] La 2 O 3 (4N), SrCO 3 (4N), Al 2 O 3 (5N), Ta 2 O 5 (5N) and Yb 2 O 3 (5N), the concrete chemical reaction equation is as follows:
[0027] (0.3-x)La 2 O 3 +1.4SrCO 3 +0.65Al 2 O 3 +0.35Ta 2 O 5 +x Yb 2 O 3
[0028] →2(Yb x La (0.3-x Sr 0.7 )(Al 0.65 Ta 0.35 )O 3 +1.4CO 2 ,
[0029] ②Mix the weighed raw materials evenly, press them into tablets, put them in an alumina crucible, put them in a muffle furnace, and sinter them at a constant temperature of 1200°C for more than ten hours to synthesize;
[0030] ③The synthesized Yb:(La,Sr)(Al,...
Embodiment 2
[0033] In the raw material ratio of this embodiment, x=2.0 at%. will La 2 O 3 (4N), SrCO 3 (4N), Al 2 O 3 (5N), Ta 2 O 5 (5N) and Yb 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, fully mixed, and pressurized into a block with a diameter slightly smaller than the inner diameter of the crucible, above 1200 ℃ in air After pre-sintering at high temperature for 15 hours, it was loaded into an iridium crucible to start crystal growth. The crystal growth direction is , the crystal growth rate and the crystal rotation rate are 1.5mm / h and 15rpm, respectively, and the growth atmosphere is N 2 Protective atmosphere. The initial solid-liquid interface growth line is convex toward the melt, so faults and impurities are reduced, after which the growth boundary becomes flat. In order to prevent crystal cracking, the temperature was lowered to room temperature at a rate of 50 °C / h...
Embodiment 3
[0035] In the raw material ratio of this embodiment, x=0.5at%. will La 2 O 3 (4N), SrCO 3 (4N), Al 2 O 3 (5N), Ta 2 O 5 (5N) and Yb 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, fully mixed, and pressurized into a block with a diameter slightly smaller than the inner diameter of the crucible, above 1200 ℃ in air After pre-sintering at high temperature for 10 hours, it was loaded into an iridium crucible to start crystal growth. The crystal growth direction is , the crystal growth rate and the crystal rotation rate are 2mm / h and 12rpm, respectively, and the growth atmosphere is N 2 Protective atmosphere. The initial solid-liquid interface growth line is convex toward the melt, so faults and impurities are reduced, after which the growth boundary becomes flat. To prevent crystal cracking, the temperature was lowered to room temperature at a rate of 60 °C / h after the g...
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