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Deep ultraviolet transparent sulfate crystal with ferroelectricity and optical device

An optical device, sulfate technology, applied in nonlinear optics, optics, crystal growth and other directions, can solve problems such as unsatisfactory birefringence, inability to achieve deep ultraviolet phase matching, etc., achieve large nonlinear effects, stable physical and chemical properties , the effect of good ferroelectricity

Active Publication Date: 2022-02-18
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

Although a large number of deep ultraviolet transparent nonlinear optical crystals have been discovered, due to the mutual constraint relationship among material band gap, birefringence index and nonlinear optical coefficient, a large number of deep ultraviolet transparent nonlinear optical crystals are limited by their own birefringence. Factors of unsuitable rate, unable to achieve deep ultraviolet phase matching

Method used

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  • Deep ultraviolet transparent sulfate crystal with ferroelectricity and optical device
  • Deep ultraviolet transparent sulfate crystal with ferroelectricity and optical device
  • Deep ultraviolet transparent sulfate crystal with ferroelectricity and optical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1LiKSO 4 Molten Salt Growth of Crystals

[0054] Using Li 2 SO 4 As a flux, analytically pure Li 2 SO 4 (32.970g) and K 2 SO 4 (14.200g) initial raw material according to LiKSO 4 Weigh and mix the stoichiometric ratio and the ratio of flux to flux (1:1), put it into a platinum crucible, place the crucible in the center of the molten salt furnace, and cover the furnace cover; heat up to 900°C for two days, then lowered to room temperature at a rate of 50°C / hour to obtain LiKSO 4 crystals. The crystal is colorless and transparent, has an orthorhombic structure at room temperature, and the space group is P6 3 , whose cell parameters are α=β=90°, γ=120°.

Embodiment 2

[0055] Example 2LiKSO 4 Aqueous solution growth of crystals

[0056] Analytical pure Li 2 SO 4 (5.45g) and K 2 SO 4 (8.715g) starting material according to LiKSO 4 Weigh and mix the stoichiometric ratio, add it to a 200ml beaker, then add deionized water until the raw materials are completely dissolved, continue to add deionized water until the excess is doubled, stir evenly, and heat up at a rate of 50°C / hour in a drying oven to 80°C for two days, then lowered to room temperature at a rate of 10°C / hour to obtain LiKSO 4 crystals.

Embodiment 3

[0057] Example 3LiKSO 4 Characterization of Optical Properties of Crystals

[0058] (1) At room temperature, the obtained LiKSO was characterized by McPherson2000 vacuum ultraviolet absorption spectrometer and Lambda950 ultraviolet / visible / near-infrared spectrophotometer. 4 The transmission spectrum of the crystal (see figure 1 In a), it can be seen from the figure that LiKSO 4 The deep ultraviolet cut-off absorption edge of the crystal is 160nm.

[0059] (2) At room temperature, LiKSO was tested by the Kurtz-Perry method 4 The powder frequency doubling effect of crystals (see figure 1 In b), it can be seen from the figure that LiKSO 4 The frequency doubling effect of the crystal is about KH 2 PO 4 4 times that of crystals.

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Abstract

The invention provides a deep ultraviolet transparent sulfate crystal with ferroelectricity and an optical device. The chemical formula of the sulfate crystal is MxM'yM''z(SO4) (x / 2 + y / 2 + z / 2), wherein M is selected from alkali metal, M' is selected from alkali metal or ammonium ions, and M'' is selected from alkali metal or ammonium ions; and x is greater than or equal to 1, y is greater than or equal to 1, and z is greater than or equal to 0. Periodic polarization is performed on the sulfate crystal by using an electric field to obtain the quasi-phase matching optical device.

Description

technical field [0001] The invention belongs to the application field of crystal materials, and relates to a ferroelectric deep ultraviolet transparent sulfate crystal and an optical device. Background technique [0002] Nonlinear optical crystal materials play an important role in the field of laser science and technology. Since the frequency doubling effect was first discovered in 1961, researchers have carried out a lot of work in the research of nonlinear optical crystal materials, discovered a series of new nonlinear optical crystals, and realized the commercialization of nonlinear optical crystals in the ultraviolet-infrared band. However, the task of developing deep ultraviolet nonlinear optical crystals is still very arduous. Although a large number of deep ultraviolet transparent nonlinear optical crystals have been discovered, due to the mutual constraint relationship among material band gap, birefringence index and nonlinear optical coefficient, a large number of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B7/08C30B9/12C30B28/04G02F1/355C30B33/04
CPCC30B29/46C30B7/08C30B9/12C30B28/04G02F1/3551C30B33/04
Inventor 龙西法沙洪源王祖建苏榕冰何超杨晓明
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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