Annealing method of neodymium, cerium and chromium doped yttrium aluminum garnet crystal

Abstract

The invention discloses an annealing method of a neodymium, cerium and chromium doped yttrium aluminum garnet (YAG) crystal. The method comprises the steps that: a carbon fiber crucible is adopted; the neodymium, cerium and chromium doped yttrium aluminum garnet Nd<3+>:Ce<3+>:Cr<3+>:YAG crystal is placed into the crucible, and is embedded by using alumina powder; temperature and cleanness are maintained; an annealing furnace door is closed; high-purity argon is delivered into the furnace for protecting; the temperature is first increased to 400 DEG C with a speed of 100 DEG C / h, and is increased to 1200-1300 DEG C with a speed of 50-70 DEG C / h; the temperature is maintained for 12-36h; the temperature is reduced to 150-200 DEG C, and the power is shut off; the temperature is naturally reduced to 30 DEG C, and the crystal is fetched from the furnace. With the method, scattering particles and stress in the crystals are eliminated, such that crystal defect is reduced; crustal entire laser performance and optical performance are improved, and oxidation loss of a large amount of precious metal iridium is avoided.

Description

technical field [0001] The invention relates to the technical field of crystal heat treatment technology, in particular to a yttrium aluminum garnet (Nd) doped with neodymium, cerium and chromium 3+ : Ce 3+ :Cr 3+ :YAG) crystal annealing method. Background technique [0002] Yttrium aluminum garnet doped with neodymium, cerium and chromium (referred to as Nd 3+ : Ce 3+ :Cr 3+ :YAG) crystal annealing is a method to eliminate some defects generated during crystal growth and remove them through high temperature treatment to improve their optical uniformity. At present, the general crystal annealing uses muffle furnace, ceramic crucible and other high-temperature resistant material crucibles. The crystal material is loaded into the crucible, and the annealing is carried out through the process of heating, constant temperature and cooling. [0003] Nd 3+ : Ce 3+ :Cr 3+ :YAG laser crystal, Nd 3+ is the main excited ion of the laser in the crystal, Ce 3+ is the sensitizi...

AI Technical Summary

Problems solved by technology

And the general crystal annealing method often causes a large number of scattering particles in the crystal, and there is a certain growth stress, optical processing stress, etc., which seriously affects the laser performance of the crystal.

Using iridium crucible medium frequency induction heating, although the method of annealing with part of oxygen in the furnace can eliminate scattering particles, it will also cause a large amount of oxidation loss of precious metal iridium, and iridium is expensive and expensive