Process for preparing laser rod with undoped ends

A preparation process and technology of laser rods, which are applied in the fields of single crystal growth, active medium materials, chemical instruments and methods, etc., can solve the problems of difficult to fundamentally improve the beam quality, reduce the service life, separate and fall off, and increase the average output power. and laser pulse repetition frequency, improve cooling effect, prolong service life effect

Inactive Publication Date: 2005-09-21
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0004] The bonding method has the following problems: the optical processing requirements of the crystal are extremely strict, and, although it is bonded under high temperature and pressure, it is difficult to eliminate the disordered state of the interface atomic arrangement at the crystal junction only by high temperature diffusion. Not to mention the existence of various dislocations, stress and other defects, making it difficult to fundamentally improve the beam quality
Long-term use of the bonded laser rod will cause deformation at the seam, which will not only affect the beam quality of the laser, but also cause separation and fall off in severe cases, reducing the service life

Method used

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Embodiment Construction

[0015] During the experiment, DJ400 single crystal furnace was used, medium frequency induction heating, iridium crucible filled, Czochralski (Czochralski) growth method. The speed used is 10-25r.p.m. During the experiment, generally according to the actual application requirements, a laser rod with a diameter of 2-8 mm and a length of 35-150 mm is used for non-doped crystal bonding.

[0016] 1. Put a φ5×150mm Nd:YAG laser rod, Nd in the laser rod 3+ The concentration of ions is 1.1% by weight, put into Y from the top at 1970°C 2 o 3 and Al 2 o 3 In a 500g melt with a ratio of 1:1mol, after micro-melting at the edge of the laser rod, pull at a rate of 0.5mm / h, grow at a rate of 3mm / h after growing 1mm, and grow at a speed of 18r.p.m. After the 9mm non-doped YAG single crystal is obtained, the laser rod is reversed and the above process is repeated to obtain a single crystal laser rod with no doped Nd:YAG at both ends.

[0017] 2. Put φ3×35mm Nd:GdVO 4 Laser rod, Nd in l...

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Abstract

The present invention belongs to field of monocrystal growing technology. The technological process of preparing laser rod with undoped ends includes the following steps: conventional growth to produce laser rod; setting the laser rod from top into molten liquid medium the same as the laser matrix to smelt slightly the edge of the laser rod and to grow the undoped end in the required length in conventional monocrystal growing process; turning the laser rod and repeating the said conventional monocrystal growing process to obtain the monocrystal laser rod with undoped ends. The present invention solves the problem of laser rod ends incapable of being cooled, reaches the complete cooling of laser rod and raises the cooling effect. The laser rod of the present invention is superior to available adhered laser rod, and has improved laser beam quality, raised efficiency, prolonged service life of laser crystal, increased average output laser power and raised laser pulse repeating frequency.

Description

technical field [0001] The invention discloses a single crystal growth process of a laser rod with no doping at both ends, belonging to the technical field of single crystal growth, and relates to a preparation process of a laser rod with no doping at both ends. Background technique [0002] Laser rods, that is, laser crystals, are composed of laser substrates and active ions. After absorbing the energy of the pump light, the active ions jump to the excited state energy level, and the number of particles is reversed between the laser energy level and the ground state, and return to the ground state under the excitation of external light. , while emitting laser light in the same phase as the incident light. Therefore, the active ions in the laser rod are essential substances, and also the main reason for the heating of the crystal. With the development of laser technology, when using high power density and high pulse frequency, the problem of heat dissipation of laser rod be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B9/00C30B15/00H01S3/16
Inventor 臧竞存邹玉林单秉锐
Owner BEIJING UNIV OF TECH
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