A method to eliminate the cracking of the tail of yag laser crystal

Abstract

The invention relates to a method for eliminating tail cracking of a YAG (Yttrium Aluminum Garnet) laser crystal. According to the method, in the preparation process of a YAG laser crystal, ending lifting is carried out at three stages, that is, at a first stage, the lifting speed is 0.5-2mm / minute, and the lifting distance at the first stage accounts for 15-30% of the total length of a crystal tail; at a second stage, the lifting speed is 2.5-5mm / minute, and the lifting distance at the second stage accounts for 30-40% of the total length of the crystal tail; at a third stage, the lifting speed is 5-7mm / minute, and lifting distance at the third stage accounts for 40-55% of the total length of the crystal tail. As the speeds in the lifting process at an ending stage are controlled at different stages, the problem that the tail end of a crystal rod is cracked as the interior of the crystal rod is not uniformly stressed at the ending stage of the YAG laser crystal can be solved, the passpercent of the tail part of the crystal rod is up to 100%, and good economic benefits and application prospects can be achieved.

Description

technical field [0001] The invention relates to the field of crystal preparation, in particular to a method for eliminating cracking at the tail of a YAG laser crystal. Background technique [0002] YAG, is the abbreviation of yttrium aluminum garnet, the chemical formula is Y 3 Al 5 o 12 , by Y 2 o 3 and Al 2 o 3 A composite oxide formed by the reaction, which belongs to the cubic crystal system and has a garnet structure. [0003] YAG series crystals are mainly used as laser crystal rods in solid-state lasers. They can be used to convert laser frequencies, extend laser wavelengths, modulate laser intensity and phase, complete holographic storage of laser signals, and self-pumping to eliminate wavefront domain changes. Pu phase conjugation etc. Laser crystal rods are one of the functional materials for optoelectronic information and the main material basis for optoelectronic technology, especially laser technology. Its development level is closely related to the dev...

AI Technical Summary

Problems solved by technology

There is a large temperature gradient in the radial direction of the ingot at the end of the pulling process, which can easily cause uneven stress at the end of the ingot, which will cause the end of the ingot to crack, and even the entire ingot to burst, thereby reducing the qualified rate of the product and increasing the production cost.

[0007] At present, in the preparation process of YAG laser crystal, the cracking rate of the ingot is about 15-40%, which is extremely unfavorable for the production of enterprises.