Method for growing calcium borate oxysalt crystal with frequency multiplication effect

A technology of calcium borate oxygen and frequency doubling effect, applied in crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of complex processing, poor device performance, low utilization rate, etc., and achieve simple crystal processing and crystal utilization rate High, the effect of improving the utilization rate

Inactive Publication Date: 2011-01-12
SHANDONG UNIV +1
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Problems solved by technology

[0009] The purpose of the present invention is to: for the existing rare earth Nd 3+ Doped or pure calcium oxyyttrium borate YCOB or calcium oxygadolinium borate GdCOB has the disadvantages of complex crystal processing, low utilization rate and poor device performance due to its low symmetry and the best phase matching direction not in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example prepares calcium borate oxysalt Nd grown along the optimal frequency doubling direction (θ=113°±5°, φ=36.5°±5°) 0.1 Y 0.9 Ca 4 O(BO 3 ) 3 ; Wherein, the Nd doping concentration is x=0.1.

[0039] In this embodiment, the high-purity Y 2 o 3 、Nd 2 o 3 , CaCO 3 And boric acid as raw material, the application of conventional pulling method, the specific steps are as follows:

[0040] 1). Calculate the raw materials according to the conventional method for preparing calcium borate oxysalt crystals: that is, according to the following calcium borate oxysalt Nd x Y 1-x Ca 4 O(BO 3 ) 3 The stoichiometric ratio of the crystal chemical formula weighs raw materials, where, Nd 3+ The doping concentration x is 0.1; that is Nd 0.1 Y 0.9 Ca 4 O(BO 3 ) 3 ; The chemical equation is as follows:

[0041] 0.1Nd 2 o 3 +0.9Y 2 o 3 +8CaCO 3 +6H 3 BO 3 →2Nd 0.1 Y 0.9 Ca 4 O(BO 3 ) 3 +8CO 2 ↑+9H 2 O ↑ The total amount of raw material is determined ...

Embodiment 2

[0048] Preparation of calcium borate oxysalt Nd grown along the optimal frequency-doubling direction (θ=67°±5°, φ=143°±5°) 0.001 Y 0.999 Ca 4 O(BO 3 ) 3 Crystal (Nd:YCOB crystal); wherein, the Nd doping concentration is x=0.001.

[0049] The growth process of this embodiment is the same as that described in Embodiment 1, except that the cutting direction of the seed crystal is (θ=67°±5°, φ=143°±5°).

[0050] 1). According to Nd 0.001 Y 0.999 Ca 4 O(BO 3 ) 3 The stoichiometric ratio weighs raw materials, and its chemical equation:

[0051] 0.001Nd 2 o 3 +0.999Y 2 o 3 +8CaCO 3 +6H 3 BO 3 →2Nd 0.001 Y 0.999 Ca 4 O(BO 3 ) 3 +8CO 2 ↑+9H 2 O ↑ The total amount of raw material is determined according to the crucible size and demand, and the present embodiment is about 300g;

[0052] 2). Mix the raw materials taken in step 1) evenly, put them into a mold and press into a platinum crucible, and sinter at a temperature of 1000°C to obtain calcium borate oxysalt N...

Embodiment 3

[0058] Prepare YCOB crystals grown along the optimal frequency doubling direction (θ=113°±5°, φ=36.5°±5°).

[0059]As described in Example 1, the difference is that the raw material is selected as Y 2 o 3 , CaCO 3 and boric acid, according to YCa 4 O(BO 3 ) 3 Chemical formula for ingredients:

[0060] Y 2 o 3 +8CaCO 3 +6H 3 BO 3 →2YCa 4 O(BO 3 ) 3 +8CO 2 ↑+9H 2 O↑

[0061] The seed crystal is a Nd:YCOB crystal cut along the direction (θ=113°±5°, φ=36.5°±5°),

[0062] Its growth process is identical with embodiment 1.

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Abstract

The invention relates to a method for growing a calcium borate oxysalt crystal with a frequency multiplication effect. The method comprises the following steps of: weighing raw materials according to a stoichiometric ratio of a chemical equation of the calcium borate oxysalt and performing crystal growth by the traditional pulling method, wherein a seed crystal is formed by finding the direction of the maximum nonlinear coefficient of the calcium borate oxysalt crystal which grows in the traditional direction through X-ray diffraction and cutting the crystal along the optimum phase matching direction; conveying the cut seed crystal slowly, vertically and downwards into polycrystal material melt to make the top of the seed crystal contact with the polycrystal material melt; maintaining the seed crystal to grow in the vertical direction of the polycrystal material liquid level of the calcium borate oxysalt; and obtaining the calcium borate oxysalt crystal with the frequency multiplication effect through three technological processes of necking, shouldering and ending. The method avoids the defects of complicated process, low utilization ratio, low properties of devices and the like caused by that the traditional calcium borate oxysalt crystal grows along the b direction. The method has the advantages of high optical homogeneity in the light-transmitting direction and high practical value.

Description

technical field [0001] The invention relates to a crystal growth method with frequency doubling effect, in particular to a calcium borate yttrium oxide YCa with frequency doubling effect 4 O(BO 3 ) 3 (abbreviation: YCOB) or calcium borate gadolinium GdCa 4 O(BO 3 ) 3 , (abbreviation: GdCOB], and neodymium Nd with self-frequency doubling effect 3+ The growth method of doping YCOB or GdCOB crystal with the best phase matching direction. Background technique [0002] As an important means of frequency conversion, frequency doubling has been widely used in optical storage, laser printing, laser indication, deep-sea detection and communication, military command and other fields related to international people's livelihood, and has demonstrated important Application prospects. As an important frequency doubling material, calcium borate yttrium oxide YCa 4 O(BO 3 ) 3 (hereinafter abbreviated: YCOB) or calcium borate gadolinium Ca 4 O(BO 3 ) 3 , (abbreviation: GdCOB] ha...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B15/00
Inventor 王继扬张怀金于浩海王正平蒋民华许祖彦宗楠彭钦军
Owner SHANDONG UNIV
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