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Nonlinear optical crystal boric acid lutetium lanthanum scandium

A technology of boric acid and crystals, applied in the fields of nonlinear optics, optics, instruments, etc., can solve problems such as limiting practical applications and difficulty in growing high-quality single crystals

Inactive Publication Date: 2008-10-29
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nonlinear Optical Crystal YAl 3 (BO 3 ) 4 (YAB) has large nonlinear optical coefficients and moderate birefringence in the visible and ultraviolet regions, but it is difficult to grow high-quality single crystals, which limits its practical application

Method used

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  • Nonlinear optical crystal boric acid lutetium lanthanum scandium
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  • Nonlinear optical crystal boric acid lutetium lanthanum scandium

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: Synthesis of LLSB.

[0029] It is sintered at high temperature (1100°C) by solid phase synthesis method, and its chemical reaction equation is as follows:

[0030] 0.5Lu 2 o 3 +0.5La 2 o 3 +Sc 2 o 3 +2B 2 o 3 = Lu x La y sc z (BO 3 ) 4

[0031] And add 1.5wt% LiBO 2 to facilitate the reaction. The specific operation steps are: mix the raw materials in an agate mortar and carefully grind them, then put them into an alumina crucible (Φ30×30mm), put them in a muffle furnace and sinter at 850°C for 2 hours, then take out the crucible and cool it to room temperature. Loose, take out the sample and re-grind it evenly, then put it in a crucible, and sinter it in a muffle furnace at 1100°C for 12 hours, at this time the sample is formed together. Take it out at this time, put it into a mortar, mash and grind it to get the product. X-ray powder diffraction measurements of polycrystalline samples of LLSB synthesized by solid-state reactions. Carry out...

Embodiment 2

[0032] Example 2: growing a small single crystal of LLSB.

[0033] Spontaneous nucleation and growth of small single crystals of LLSB, with Li 6 B 4 o 9 As a flux, the ratio of raw materials is Lu 2 o 3 / La 2 o 3 / Sc 2 o 3 / B 2 o 3 / Li 2 CO 3 =0.5:0.5:1:6:6 is LuLaSc 2 (BO 3 ) 4 : Li 6 B 4 o 9 =1:2. After mixing and grinding the raw materials in a mortar, put them into a Pt crucible (Φ30×30mm), put them in a muffle furnace at 1100°C, keep the temperature for 18h, then drop from 1100°C to 800°C at a rate of 10°C / h. The flux is washed away with hot dilute nitric acid to obtain LLSB single crystals with a particle size of millimeter order.

Embodiment 3

[0034] Example 3: Growth of large-sized LLSB single crystal.

[0035] Large-size single crystals are grown by the molten salt method, using Li 6 B 4 o 9 As a flux, the melt is prepared according to the following molar ratio: Lu 1.3 La 1.3 sc 2 (BO 3 ) 4 : Li 6 B 4 o 9 =1:2. Use a platinum crucible as a container, heat it with a resistance furnace, and control the temperature with a single 808AP machine. First, the material is melted in the muffle furnace, and the raw material is added in batches until the raw material is completely melted. After cooling, it is transferred to a self-made growth furnace. Raise the temperature to 1100°C and keep the temperature constant for 48 hours to fully melt and mix the raw materials evenly. Then drop the melt down to 950°C, and drop the seed crystal into the melt. After a few hours, the seed crystal will leave the liquid surface, and then drop to 940°C, put the seed crystal, and keep the temperature for several days until the see...

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Abstract

The invention relates to a nonlinear optical crystal boric acid lutetium lanthanum scandium, in particular to a novel nonlinear optical crystal. The crystal structure of the invention belongs to a trigonal system, a space group is: R32 and unit cell parameters are that: a is equal to 9.8742, c is equal to 8.0696, Gamma is equal to 120 degrees, and Zeta is equal to 3. An ultraviolet absorption edge is smaller than 200nm, and a nonlinear optical coefficient is 1.29pm / V. LLSB monocrystal grows by using a molten salt method and taking borate as a fluxing agent. The LLSB monocrystal has higher nonlinear optical coefficient, wide diaphanous wave band, moderate double refraction rate, stronger degree of hardness, high melting point and stable chemical and thermal properties, and the LLSB monocrystal can be widely applied to the ultraviolet visible range.

Description

technical field [0001] The invention relates to a novel optoelectronic functional material, in particular to a novel nonlinear optical crystal. Background technique [0002] As an important light source, ultraviolet laser has a wide range of applications in laser micromachining, semiconductor lithography, optical information storage, and laser medical treatment. Excimer ultraviolet lasers currently used have insurmountable defects, such as bulky, expensive equipment, high maintenance costs, poor beam quality, and need to be equipped with expensive optical systems for focusing. Therefore, excimer laser replacement has become the general trend. The core component of an all-solid-state UV laser system is a nonlinear optical crystal capable of generating UV harmonics. Therefore, it is necessary to develop ultraviolet nonlinear optical crystals with excellent comprehensive performance and application prospects to provide reliable and durable frequency doubling devices for all s...

Claims

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Application Information

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IPC IPC(8): G02F1/355
Inventor 叶宁李炜
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI