Yb: YAG (yttrium aluminum garnet) and Cr, Yb: YAG self-Q-switching laser

Abstract

An Yb: YAG (yttrium aluminum garnet) and Cr, Yb: YAG self-Q-switching laser relates to a laser. The invention provides the Yb: YAG and Cr, Yb: YAG self-Q-switching laser with efficient and high-peak power laser output by bonding a Yb:YAG crystal and a Cr, Yb: YAG crystal. The Yb: YAG and Cr, Yb: YAG self-Q-switching laser is provided with a pump source, an isolator, a first lenticular lens, a second lenticular lens, the laser gain medium Yb:YAG crystal and the Cr, Yb:YAG crystal; the pump source, the isolator, the first lenticular lens, the second lenticular lens, the laser gain medium Yb:YAGcrystal and the Cr, Yb:YAG crystal are sequentially arrayed and positioned on the same optical axis from front to back, an anti-reflection film and a high-reflection film are plated on the rear surface of the laser gain medium Yb:YAG crystal and used as a rear cavity mirror of a laser cavity, and an anti-reflection film and a reflecting film are plated on the front surface of the Cr, Yb:YAG crystal and used as a front cavity mirror of the laser cavity.

Description

technical field [0001] The invention relates to a laser, in particular to a ytterbium-doped yttrium aluminum garnet and double chromium-doped ytterbium yttrium aluminum obtained by bonding Yb:YAG crystal and Cr, Yb:YAG crystal with high efficiency and high peak power laser output Garnet (Yb:YAG / Cr, Yb:YAG) self-Q-switching laser. Background technique [0002] Yttrium aluminum garnet crystals doped with rare earth ions (Y 3 Al 5 o 12 , that is, YAG) occupies a pivotal position in the field of solid-state lasers due to its excellent physical and mechanical properties, high chemical stability, and excellent optical properties. In particular, Yb:YAG crystal has wide absorption band, long fluorescence lifetime, high doping concentration and high quantum efficiency. Under the same pump power, the heat generated by Yb:YAG crystal during laser operation is only Nd: One third of YAG. End-pumped, side-pumped rod lasers and thin-sheet lasers have obtained continuous laser output o...

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Problems solved by technology

In 2003, Y.Zhou et al. ([4] Zhou, Q.Thai, Y.C.Chen, and S.Zhou, "Monolithic Q-switched Cr, Yb: YAG laser," Opt.Commun.219, 365-367 (2003 ).) Using 0.75mm thick Cr, Yb:YAG self-Q-switching laser crystal as the laser gain medium, where Yb 3+ The doping concentration of ions is 5at.%, the doping concentration of Cr ions is 0.5at.%, and the self-Q laser output of 0.5ns is obtained under the pumping of the laser diode, but due to the Cr used, the Yb:YAG self- Yb in Q-switched laser crystal 3+ The doping concentration of ions is low, the output laser efficiency is very low, and with the damage of Cr, Yb:YAG self-Q laser crystal optical coating, there is no practical application prospect

Cr, Yb:Yb in YAG self-Q-switching laser crystal 3+ ions and Cr 4+ All ions absorb the pump light, but only Yb 3+ The pump light absorbed by ions has an effect on the inversion number of laser particles, and the Cr 4+ The absorption of pump light by ions causes the loss of pump light, so the working efficiency of the whole system is low, which is not conducive to obtaining efficient integrated miniaturized high peak power solid-state lasers

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