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Non-linear infrared inorganic optical crystal and its preparing process

A technology of nonlinear optics and crystal materials, applied to the growth of polycrystalline materials, active dielectric materials, chemical instruments and methods, etc., can solve the problems of small bandwidth of semiconductor materials, laser damage, etc., and achieve good thermal stability and air stability Effect

Inactive Publication Date: 2004-11-03
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The semiconductor material has a small bandwidth, although the nonlinear optical coefficient is large, it is also easy to cause laser damage

Method used

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  • Non-linear infrared inorganic optical crystal and its preparing process
  • Non-linear infrared inorganic optical crystal and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: CsCdBr 3 preparation

[0018] 0.81 g (4 mmol) CsBr and 1.46 g (4 mmol) CdI 2 Mixed in about 3 ml of secondary distilled water, stirred at 100 ° C for 3 hours, cooled to room temperature naturally, and gradually precipitated a large number of colorless rod-shaped crystals. Suction filtration, drying the product under infrared light.

Embodiment 2

[0019] Example 2: CsCdBr 3 single crystal growth

[0020] CsCdBr 3 The aqueous solution was placed in a 35°C incubator. Add transparent small seed crystals without obvious defects. After 1 to 2 months, a hexagonal prism-shaped transparent single crystal with a larger size is the desired crystal material.

[0021] The obtained compound was determined by X-ray single crystal structure, and its crystal structure arrangement is shown in the accompanying drawing. It can be seen that the anionic groups of this compound have an octahedral configuration and form a one-dimensional chain structure through coplanarity. The bond length analysis shows that the six Cd-Br bond lengths in the octahedron are divided into two groups: 2.774 and 2.804 , with a difference of 0.03 ; and the direction of the distortion is basically the same, which is conducive to the geometric superposition of the microscopic second-order nonlinear optical effects.

Embodiment 3

[0023] CsCdBr 3 Preparation: Mix equimolar amounts of CsBr and CdI 2 Dissolve in double distilled water, reflux until the solution becomes transparent, filter, cool naturally, separate the precipitate and dry to obtain CsCdBr 3 .

[0024] CsCdBr 3 Growth of single crystals: the resulting CsCdBr 3 Put it in a container, add secondary distilled water, heat and dissolve it, put it in a constant temperature bath at 60°C, add transparent small seed crystals without obvious defects, and after 15 days, grow into a larger-sized hexagonal prism-shaped transparent single crystal. required crystal material.

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Abstract

A CsCdBr3 crystal with central asymmetric structure, full transparency in visual and infrared region and high two-order non-linearity optical coefficient is prepared through dissolving CsBr and CdI2 in secondary distilled water, refluxing until solution becomes transparent, filtering, natural cooling to educe out CsCdBr3, adding secondary distilled water, thermal dissoving, putting in a thermostat at 30-60 deg.C, adding selected crystal seeds and growing for 15 days to obtain the hexaprismatic crystals.

Description

technical field [0001] The invention relates to an infrared inorganic nonlinear optical crystal material and a preparation method thereof, belonging to the field of inorganic chemistry and the field of optical materials. Background technique [0002] Nonlinear optical effects originate from the interaction of laser light with the medium. When the laser propagates in a medium with a non-zero second-order polarizability, nonlinear optical effects such as frequency doubling, sum frequency, difference frequency, and parametric amplification will occur. Using the second-order nonlinear optical effect of crystals, nonlinear optical devices such as second harmonic generators, frequency converters, and optical parametric oscillators can be made, which have important applications in many fields, such as laser technology and national defense. value. Inorganic nonlinear optical materials are dominant in the practical research of second-order nonlinear optical materials. Inorganic no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B7/00C30B29/12H01S3/16
CPCC30B7/00
Inventor 任鹏秦金贵杨雪梅刘涛陈创天吴以成
Owner WUHAN UNIV
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