Hf:Er:LiNbO3 crystal and preparation method thereof

Abstract

A Hf:Er:LiNbO3 crystal and its preparing method, belongs to a crystal ant its preparing method. The invention solves the problem that magnesium and zinc are intermingled to improve the anti-light-damage capacity of lithium niobate crystal, with a premise that itself good capability of lithium niobate crystal is kept, but itself good optical capability of the crystal is suppressed. The inventive Hf:Er:LiNbO3 crystal is made of HfO2, Er2O3, Nb2O5 and LiCO3, which are all the purity of 99.99%; in which the intermingled amount of HfO2 is 2-6 mol% by the total amount of HfO2, Er2O3, Nb2O5 and LiCO3, the intermingled amount of Er2O3 is 0.5-2 mol % by the total amount of HfO2, Er2O3, Nb2O5 and LiCO3, and the mol ratio of Li and Nb is 0.964. The preparing method includes: (1) weighing and mixing HfO2, Er2O3, Nb2O5 and LiCO3; (2) growing the crystal by the pulling method; (3) polarizing; (4) polishing the crystal under surface optical quality class after cutting it to produce a Hf:Er:LiNbO3 crystal. The inventive Hf:Er:LiNbO3 crystal has high glossiness and is uniform, with no flaw, growing strip and crack. The inventive method for producing the Hf:Er:LiNbO3 crystal is simple and is easy to operate, and has rapid growing speed of the crystal.

Description

technical field [0001] The invention relates to a crystal and a preparation method thereof. Background technique [0002] Solid-state green up-conversion light sources are widely used in high-density optical storage, color flat panel display, optoelectronics and medical diagnosis. So far, green upconversion luminescence has been found in many crystalline materials. And Er:LiNbO 3 The crystal is one of the important ones, because the trivalent erbium ion, as an active ion in the up-conversion luminescent material, has high up-conversion luminous efficiency; lithium niobate crystal has excellent piezoelectric, ferroelectric, photoelectric , nonlinear and photorefractive properties, therefore, Er:LiNbO 3 The crystal is a rare crystal material that combines the excellent properties of erbium element and lithium niobate crystal. Because Er:LiNbO 3 Many researchers have once again turned their attention to lithium niobate, a traditional crystal material, for the application a...

AI Technical Summary

Problems solved by technology

Although, Er:LiNbO 3 Crystals have many of the above advantages, however, due to the low light damage resistance of lithium niobate crystals, their application in actual production is severely limited. Usually, doping with anti-light damage elements such as magnesium and zinc, or increasing The ratio of niobium to lithium in lithium niobate crystals is used to overcome this shortcoming

However, the traditional anti-photodamage dopant must be at a high concentration, for example, the concentration of magnesium is 5 mol% (anti-photodamage threshold concentration), and the requirement of zinc is higher 6.5mol%, in order to exert the anti-photodamage effect, In actual crystal growth, the incorporation of high-concentration anti-light damage dopants makes it difficult to grow crystals, for example, the growth of crystal components is not uniform, the appearance of growth stripes, the crystal is easy to break, and the components that appear during the polarization process Segregation and other phenomena that seriously affect the quality of the crystal; at the same time, the high concentration of doping suppresses the excellent performance of the lithium niobate crystal itself. Lithium niobate crystals have achieved excellent light damage resistance, but the diffraction efficiency is seriously reduced, which is undesirable in the realization of mass optical information storage; another example, high-concentration magnesium-doped Er:LiNbO 3 The fluorescence lifetime of the crystal decreases sharply, which is Er:LiNbO 3 Crystals are the last thing you want to see in solid-state laser applications

In fact, the research on anti-photodamage doping in the past is more limited to how to improve the anti-photodamage ability of the crystal itself, while ignoring the effect of anti-photodamage dopants on LiNbO 3 The influence of other aspects of the optical properties of the crystal

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