Rubidium lithium titanium germanate compound, rubidium lithium titanium germanate non-linear optical crystal and preparation methods and application thereof

A technology of nonlinear optics and lithium compounds, applied in the direction of nonlinear optics, germanium compounds, chemical instruments and methods, etc., can solve the problems of low crystal damage threshold, poor optical uniformity, high half-wave voltage, etc., and achieve large nonlinear optical effects , no deliquescent raw material cost, good physical and chemical properties

Active Publication Date: 2018-09-07
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

These crystals have certain disadvantages, such as DKDP crystals are easy to absorb moisture because they grow from aqueous solution; LiNbO 3 Crystals with low damage threshold, poor optical uniformity, and stoichiometric LiNbO 3 Single crystal growth is difficult; KTP crystals have high conductivity and "gray trace" problems, which affect their use in high-power lasers
LGS crystals are inconvenient for practical electro-optic use due to their optical activity
BBO crystals have a high damage threshold and are currently the first choice for use in high-power lasers. However, the half-wave voltage of this crystal is high, and it is difficult to grow a crystal with a thickness that can meet practical applications.

Method used

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  • Rubidium lithium titanium germanate compound, rubidium lithium titanium germanate non-linear optical crystal and preparation methods and application thereof
  • Rubidium lithium titanium germanate compound, rubidium lithium titanium germanate non-linear optical crystal and preparation methods and application thereof
  • Rubidium lithium titanium germanate compound, rubidium lithium titanium germanate non-linear optical crystal and preparation methods and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] a Rb 4 Li 2 TiGe 4 o 13 Compound, preparation method comprises the steps:

[0048] Prepared by solid phase reaction method, the reaction equation is 2Rb 2 CO 3 +Li 2 CO 3 +TiO 2 +4GeO 2 =Rb 4 Li 2 TiGe 4 o 13 ; The proportioning ratio of the above three reagents: Rb 2 CO 3 (4.6189g, 0.02mol), Li 2 CO 3 (0.7389, 0.01mol), TiO 2 (0.7987g, 0.01mol), GeO 2 (4.1844g, 0.04mol); Its specific preparation steps are: take reagent by weighing respectively by above-mentioned dosage, put them in mortar, grind and mix, then pack in platinum crucible, put into muffle furnace, with 50 The rate of ℃ / h is raised to 500 ℃ for pre-calcination, and then cooled for 24 hours. After cooling to room temperature, the sample is taken out and re-ground and mixed, and then placed in a muffle furnace for sintering at 800 ℃ for 48 hours to obtain polycrystalline Rb 4 Li 2 TiGe 4 o 13 compound.

Embodiment 2

[0050] Preparation of Rb by flux method 4 Li 2 TiGe 4 o 13 A nonlinear optical crystal, comprising the steps of:

[0051] LiF was used as a flux, and the molar ratio of solute to solvent was 1:0.5. Weigh 461.89 g of Rb respectively 2 CO 3 (2mol), 73.89 g Li 2 CO 3 (1mol), 79.87 grams of TiO 2 (1mol), 418.44 g GeO 2 (4mol) and 12.97 grams of LiF (0.5mol), after grinding and mixing in the mortar, melting in batches into the crucible of Φ80mm * 80mm; the crucible after the chemical material is put into the vertical crystal growth furnace, Raise the temperature to 900°C, stir at constant temperature for 48 hours, then cool down to 5°C above the saturation point, introduce the seed crystal and cool down at a rate of 0.5°C / day, and start crystal growth at a rotation speed of 10r / min. After the crystal growth is completed, lift the seed crystal Rod, lift the crystal from the liquid surface, and then cool down to room temperature at a rate of 20°C / h to obtain transparent Rb...

Embodiment 3

[0053] Preparation of Rb by Flux Top-Seed Method 4 Li 2 TiGe 4 o 13 A nonlinear optical crystal, comprising the steps of:

[0054] Use LiF-RbF as a flux, and the molar ratio of solute to solvent is 1:1:0.5. Weigh 230.959 grams of Rb respectively 2 CO 3 (1mol), 36.95 g Li 2 CO 3 (0.5mol), 39.94 grams of TiO 2 (0.5mol), 209.22 grams of GeO 2 (2mol), 12.97 grams of LiF (0.5mol) and 26.12 grams of RbF (0.25mol), after grinding and mixing in a mortar, they were melted in batches and loaded into a Φ70mm×70mm crucible; the crucible after the material was put into In the vertical crystal growth furnace, heat up to 800°C, stir at constant temperature for 48 hours, then cool down to 10°C above the saturation point, introduce seed crystals, make the seed crystals just contact with the liquid surface, and then cool down at a rate of 0.5°C / day , the rotation speed is 25r / min to start crystal growth, after the crystal growth is completed, the crystal is lifted from the liquid surf...

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Abstract

The invention discloses a rubidium lithium titanium germanate compound, a rubidium lithium titanium germanate non-linear optical crystal and preparation methods and application thereof. A chemical formula of the rubidium lithium titanium germanate compound is Rb4Li2TiGe4O13; a chemical formula of the rubidium lithium titanium germanate non-linear optical crystal is Rb4Li2TiGe4O13; the rubidium lithium titanium germanate non-linear optical crystal is non-centrosymmetrical structure, belongs to the tetragonal system and has a space group P4nc, is prepared by adopting a co-solvent method. The invention further discloses the rubidium lithium titanium germanate non-linear optical crystal to application of a laser non-linear optical compound functional device, an electro-optical crystal device or a laser device. The rubidium lithium titanium germanate non-linear optical crystal provided by the invention has a relatively great non-linear optical effect, a high electro-optical coefficient anda wide transmission range, has good mechanical properties and does not deliquesce; the frequency-doubled effect is 3 to 5 times of KDP (potassium dihydrogen phosphate).

Description

technical field [0001] The invention relates to the technical field of artificial crystals. More specifically, it relates to a titanium rubidium lithium germanate compound, a titanium rubidium lithium germanate nonlinear optical crystal, a preparation method and an application thereof. Background technique [0002] Nonlinear optical phenomena include frequency conversion effects such as frequency doubling effect, difference frequency, and sum frequency, as well as electro-optic effects, among which frequency doubling and electro-optic effects are the most widely used. Crystal materials with the above effects are collectively called nonlinear optical materials. One of the necessary conditions for use as a second-order nonlinear optical crystal material is to have a non-centrosymmetric structure. [0003] With the development of laser technology, lasers with different wavelengths are in great demand in different fields of national economy and people's livelihood, such as nat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B9/12C30B29/32G02F1/355C01G17/00
Inventor 李如康夏明军
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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