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Large size non-linear optic crystal of boron phosphate, flux growth method and usage

A technology of nonlinear optics and growth method, which is applied in the field of molten salt growth of large-sized boron phosphate nonlinear optical crystals. question

Inactive Publication Date: 2006-08-16
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to BPO 4 -Li 4 P 2 o 7 Binary system phase diagram (see the American magazine "J.Am.Ceram.Soc." Vol.44, 393, 1961), BPO 4 and Li 4 P 2 o 7 Form a simple eutectic binary system, so Li 4 P 2 o 7 Growing BPO as a flux 4 crystals, but the viscosity of this system is high, so far it has not been possible to obtain BPO with a size sufficient for physical property testing 4 crystals, which cannot be purchased in the market, and there is no information about BPO 4 The report of the test results of the nonlinear optical properties of the single crystal or the BPO 4 The Report of Using Single Crystal to Fabricate Nonlinear Optical Devices

Method used

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  • Large size non-linear optic crystal of boron phosphate, flux growth method and usage
  • Large size non-linear optic crystal of boron phosphate, flux growth method and usage
  • Large size non-linear optic crystal of boron phosphate, flux growth method and usage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1. Crystal Growth

[0075] (1) Mix the pre-synthesized boron phosphate and flux in proportion, put it into a platinum crucible with an opening of Φ60mm×60mm, put the crucible into a vertical heating furnace, and seal the opening at the top of the furnace with insulating material Above, leave a small hole at the position corresponding to the top of the furnace and the center of the crucible for the entry and exit of the seed crystal rod, rapidly heat up to 880°C for melting, keep the temperature for 24 hours and quickly cool down to 815°C (10°C above the saturation temperature), and obtain the Mixed melt of boron phosphate and flux;

[0076] The flux is Li-containing 4 P 2 o 7 and Li 2 Composite flux of O;

[0077] The boron phosphate and Li 4 P 2 o 7 and Li 2 The molar ratio of compound flux compounding of O is: BPO 4 : Li 4 P 2 o 7 : Li 2 O=1:0.35:0.24;

[0078] (2) At 815°C (10°C above the saturation temperature), the BPO cut along the c-axis 4...

Embodiment 2

[0079] Example 2. Crystal Growth

[0080] The pre-synthesized boron phosphate and Li-containing 4 P 2 o 7 and Li 2 The compound flux of O is mixed, and its molar ratio is: BPO 4 : Li 4 P 2 o 7 : Li 2 O=1:0.35:0.18;, put it into an open platinum crucible of Φ60mm×60mm, put the crucible into a vertical heating furnace, seal the opening at the top of the furnace with insulating material, and place it between the top of the furnace and the center of the crucible Leave a small hole in the corresponding place for the seed rod to enter and exit, quickly heat up to 890°C for melting, and then quickly cool down to 816°C (5°C above the saturation temperature) after constant temperature for 48 hours to obtain a mixed melt containing boron phosphate and flux . BPO that will be cut along the c-axis 4 The seed crystal is fixed on the lower end of the seed rod with a platinum wire. The seed crystal is introduced into the crucible from the small hole on the top of the furnace, immer...

Embodiment 3

[0081] Embodiment 3 crystal growth

[0082] Crystal growth was performed using the top seed method. Using one-time synthesis, directly select analytically pure H 3 BO 3 , NH 4 h 2 PO 4 and Li 2 CO 3 , according to the following molar ratio: H 3 BO 3 : NH 4 h 2 PO 4 : Li 2 CO 3 =1:1.7:0.82, (actual BPO 4 Compounds and Li 4 P 2 o 7 and Li 2 The molar ratio of O composite flux is: BPO 4 : Li 4 P 2 o 7 : Li 2 O=1:0.35:0.12), accurately weigh the above reagents according to the stoichiometric ratio, put them in an agate mortar and grind them evenly, put them into a corundum crucible, pre-fire in a muffle furnace at 400°C for 10 hours, and then put them into the mortar and then sintered at 650°C for 48 hours, put it into an open platinum crucible, place the open platinum crucible on a certain position of the heating furnace, and seal the opening of the furnace with a suitable insulating material, and then heat up to 900 ℃ melting, constant temperature for 72 ...

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Abstract

This invention relates to macro-optical crystal of non-linear boron phosphate, illuestrated by formula of BPO4. It is characterized by: transparent, centimetre-grade, ultraviolet absorption edge=130 nm, non-linear coefficiency d36=0.98 pm / v, d31=0.36 pm / V; aniaxial negative crystal (no>ne), Moh's hardness=4; easy to be cut; easy to be polished and stored. The prepn. procedures are: (1). boron phosphate and fluxing agent are proportionally mixing, heat to being molten, keeping constant temp. for 24-72 hrs, cooling to temp. of 2-10 deg.C above the saturation temp., the ratio of boron phosphate and the fluving agent being BPO4:Li4P2O7:Li2O=1:0.35:(0.24-0.12); (2). seed crystal being placed onto seed rod is placed into the above-said molten mixture for crystal growth during the seed rod rotating, keeping constant temp for 1-6 hrs, quick dropping the temp. to saturation, lowering the temp. at speed of 1-0.2 deg.C / day, taking the crystal out of the liquid.

Description

technical field [0001] The invention belongs to a method for growing nonlinear optical crystals, in particular to a large-size boron phosphate (BPO 4 ) Molten salt growth method for nonlinear optical crystals. Background technique [0002] In laser technology, the laser wavelengths that can be directly obtained by using laser crystals are limited, and there are still blank bands from ultraviolet to infrared spectral regions. Using nonlinear optical crystals, through nonlinear optical effects such as frequency doubling, frequency mixing, and optical parametric oscillation, the limited laser wavelength can be converted into coherent light in a new band. Utilizing this technology can fill the blank spectral region of the laser wavelength emitted by various laser devices, and make the laser more widely used, so it has great application prospects and economic value in the field of laser technology. [0003] At present, borate and phosphate nonlinear optical crystals such as BBO...

Claims

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Application Information

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IPC IPC(8): C30B29/14C30B9/04
Inventor 陈创天吴以成傅佩珍李志华
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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