Hafnium iron manganese three-doped lithium niobate crystal and method of producing the same

Abstract

The invention provides a lithium niobate crystal doped with hafnium, iron and manganese and a preparation method thereof. The composition of the lithium niobate crystal doped with the hafnium iron and manganese is LiaNbbO3:Fec:Mnd:Hfe, wherein, a is between 0.934360 and 0.945525, b is 1.00000, c is between 0.00156250 and 0.003125, d is between 0.000234700 and 0.0004694, e is between 0.0450000 and0.0600000, and the idiogenous mixture ratio of [Li] / [Nb] is between 0.934360 and 0.945525. The preparation method comprises the following steps that: Li2CO3, Nb2O5, Fe2O3, MnO and HfO2 are mixed evenly according to a ratio of 9.38000:10.000:0.0078125:0.002347:0.04000 and dried, and the mixture is calcined at a temperature of 1100 DEG C for 2 hours so that a polycrystal powder material is prepared; the polycrystal powder material is heated and melted, the lithium niobate crystal doped with the hafnium, iron, manganese is grown by the Czochralski method through pulling, shouldering, being isometric and ending along a C axis direction, the puling speed is between 1 and 3 millimeters per hour, the rotating speed is between 15 and 30rpm, the gas-liquid difference in temperature is 20 DEG C, the temperature gradient in the fused mass is 1.5 DEG C per millimeter, and the difference in temperature on the upper part of the fused mass is 1 DEG C per millimeter; and the grown crystal is subjected to poling, annealing, polishing and cutting at a temperature of 1200 DEG C so that the lithium niobate crystal doped with the hafnium, iron and manganese used for storing is prepared. The method solves the problems that a three-dimensional holographic memory has long response time and information volatility, increases the response speed, and simultaneously ensures that the information is not wiped off in the information reading process, thereby having great market prospect.

Description

technical field

[0001] The invention relates to a lithium niobate crystal in the field of photoelectric crystals and a preparation method thereof, in particular to a photorefractive lithium niobate triple-doped crystal of a photoelectric crystal and a preparation method thereof. Background technique

[0002] Three-dimensional holographic memory will eventually replace the current memory and become a new generation of information storage media. However, the biggest problem facing this product at present is that it cannot find suitable storage materials.

[0003] Li was proposed in CN1277271 patent 1-x Nb 1+y o 3 :Fe m :M n Double-doped crystal, in which M is one of Mg, Zn, In anti-photorefractive doping elements. In this patent, with the doping of M impurities, the monochromatic holographic storage performance of the crystal can be improved, for example, the anti-light scattering ability can be improved, the light scattering threshold can be lowered, and the response ti...