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Use of mercuric bromide crystal serving as infrared wave range non-linear optical material

A technology of nonlinear optics and infrared bands, applied in the field of material science, can solve the problems of affecting use and low laser damage threshold

Inactive Publication Date: 2008-12-31
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing commercial infrared materials such as AgGaS 2 , AgGaSe 2 etc. Although they have large nonlinear optical coefficients, good phase matching properties, and excellent physical and chemical stability, their laser damage threshold is low, which affects their use in laser frequency conversion and other directions.

Method used

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  • Use of mercuric bromide crystal serving as infrared wave range non-linear optical material
  • Use of mercuric bromide crystal serving as infrared wave range non-linear optical material
  • Use of mercuric bromide crystal serving as infrared wave range non-linear optical material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1. Purification of mercuric bromide sample

[0020] Weigh 4 grams of commercially available analytically pure mercuric bromide sample and place it in a sublimation device for sublimation. After the sublimation is complete, collect the product after sublimation and purification, and heat to dissolve it with 150ml of distilled water. Then filter while it is hot, and the filtrate is cooled and crystallized. Filtration, repeated recrystallization of the resulting solid with water can remove impurities such as Cd salts. The lower the cooling temperature, the higher the recrystallization yield.

Embodiment 2

[0021] Embodiment 2. infrared, ultraviolet-visible spectrum, thermogravimetric analysis and environmental stability test of mercuric bromide sample

[0022] The infrared spectrum is carried out on an Omnic Nicolet 5700 spectrometer, wherein the leaf-shaped thin wafer obtained after the recrystallization of the aqueous solution is directly used to test the mid-infrared spectrum of mercury bromide, and the results are as follows Figure 4 As shown, mercury bromide has no obvious absorption peak in the entire mid-infrared spectral region (2.5-25um), indicating that the crystal has good transmission properties in the infrared band. The sample without recrystallization from aqueous solution (only sublimation treatment) is the spectrogram obtained by testing the potassium bromide tablet, and the results are as follows Figure 5 As shown, it can be seen that at 3400, 1600, 400-500cm -1 Absorption peaks appear in the vicinity, and these absorption peaks are sharp in shape, and around...

Embodiment 3

[0027] Embodiment 3. The powder frequency doubling test of mercuric bromide

[0028] The frequency doubling performance of the material is obtained by the Kurtz powder frequency doubling test method. The specific operation steps are as follows:

[0029] The starting material was purified by sublimation and recrystallization from aqueous solution, followed by crystallization of the resulting HgBr in ethanol 2 The crystal is firstly ground into a powder with a particle size of about 0.08-0.10mm in diameter, and then installed in a sample cell with glass windows on both sides, and then the sample cell is placed on the laser optical path, and a Nd:YAG pulsed laser is used as the light source to generate light with a wavelength of 1064 nm. The fundamental frequency light is injected into the sample cell, and the signal is detected by the photomultiplier tube and amplified and displayed on the oscilloscope. Then KDP and KTP samples of the same size were used as standards for compa...

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Abstract

The invention relates to an application of a mercuric bromide crystal which is taken as infrared waveband nonlinear optical material. The frequency doubling effect of the HgBr2 crystal powder is about 10 multiplied by KDP; furthermore, the phase can be matched; the full transmission is provided in the range of 400-800 nanometer (visible area) and 2.5-25 microns (working waveband of mid-infrared spectrometer); the laser damage valve value can achieve more than 0.3GW / cm<2>, which is far ahead the existing infrared nonlinear optical material and is obviously higher than the known reported highest value (0.1GW / cm<2> of LiInS2); the mercuric bromide crystal can be used as excellent infrared waveband nonlinear optical crystal and is especially suitable for the application of the frequency conversion of high-powder laser.

Description

technical field [0001] This patent relates to the application of mercury bromide crystals as nonlinear optical materials in the infrared band, and belongs to the fields of material science and optics. Background technique [0002] Second-order nonlinear crystal materials have important applications in the fields of laser frequency conversion, optical parametric oscillation, and optical parametric amplification, and are of great value to the national economy, national defense and military. The second-order nonlinear optical materials are classified into three types according to the applied wave bands: ultraviolet, visible near-infrared, and infrared. Among them, several excellent materials have been invented / discovered in the ultraviolet and visible near-infrared bands that fully meet the practical requirements, and there is a lack of practical excellent nonlinear optical materials in the infrared band. Existing commercial infrared materials such as AgGaS 2 , AgGaSe 2 etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/355
Inventor 刘涛秦金贵张刚蒋世超朱天翔仲星彦吴以成陈创天
Owner WUHAN UNIV
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