High combination property laser crystal and method for making same

Abstract

The invention discloses a high combination property laser crystal and a preparation method thereof, which belongs to the technical field of solid laser. The high combination property laser crystal comprises a club-shaped laser crystal, cylindrical surfaces at two ends of the club-shaped laser crystal are provided with coatings of heat-sinking materials with high thermal conductivity, cylindrical surfaces of parts of the club-shaped laser crystal which is not coated are formed into threaded or uniformly distributed ring-shaped structures. The preparation method of the high combination property laser crystal includes manufacturing club-shaped laser crystals which meet processing requirements, and coating heat-sinking materials with high thermal conductivity on the parts which are not processed into threaded or ring-shaped structures at two ends of the club-shaped laser crystals. The invention overcomes turbulent movement in water cooling, resolves the cooling problem of the part which is not hydro-cooled, improves heat dissipation of the laser crystals, and raises pumping uniformity and laser beam quality. Experiments prove that under the same condition, the laser output power of the high combination property laser crystal increases approximately 15%, and heat performance raises over 20%, thereby realizing high density uniform pumping without damage.

Description

technical field [0001] The invention relates to the technical field of solid-state lasers. Background technique [0002] Neodymium-doped and yttrium garnet series laser crystals have excellent laser and physical and chemical properties, and are currently the most widely used solid-state laser gain media. Due to the small quantum efficiency of this type of crystal, when a large amount of heat generated by non-radiative transitions propagates in the gain medium, thermal lens effect will occur, thereby reducing laser efficiency and laser beam quality; especially in high average power solid-state lasers. . [0003] In order to compensate or reduce this thermal effect, in 1998, R..Weber et al. proposed a composite structure of thermally bonding pure YAG crystals at both ends of the Nd:YAG laser rod; in 2002, D.Ehrentraut et al. reported using an improved pulling method Grow Yb-doped YAG inside the pure YAG tube (Journal of Crystal Growth No. 242, 2002, p. 375); in 2003, Xu Jun ...

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Problems solved by technology

[0003] In order to compensate or reduce this thermal effect, in 1998, R..Weber et al. proposed a composite structure of thermally bonding pure YAG crystals at both ends of the Nd:YAG laser rod; in 2002, D.Ehrentraut et al. reported using an improved pulling method Grow Yb-doped YAG inside the pure YAG tube (Journal of Crystal Growth No. 242, 2002, p. 375); in 2003, Xu Jun et al. proposed resistance heating epitaxial growth composite YAG / Nd:YAG / YAG, pure YAG The crystal does not absorb pump light or oscillating light, and can effectively cool the gain medium, reduce thermal effects and thermal lens effects; however, the use of the above-mentioned prior art composite laser materials has obvious disadvantages: (1) composite laser materials formed by thermal bonding For laser materials, due to the obvious boundary between pure crystals and doped crystals, the light loss is large; if it is operated for a long time, the bonding surface is easy to deform, which will reduce the laser output and laser beam quality; the technical repeatability is low, and the product Long production cycle and high cost; (2) Composite crystals grown by improved pulling method, resistance heating epitaxial growth method, etc. have poor crystal quality, a large number of defects such as bubbles and inclusions, low repeatability, and have not been obtained in devices so far. practical application

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