Single-ended pumping Q-switched laser based on doping concentration gradient crystal

Abstract

The invention discloses an end face pumping Q-switched laser based on a doping concentration gradient crystal. The end face pumping Q-switched laser is characterized in that the doping concentration of a laser working substance is exponentially increased along a light transmission direction, a pumping light incident plane, namely a pumping end face, is a low-concentration end, and a non-pumping light incident plane is a high-low-concentration end; the laser working substance is an Nd <3+>-doped crystal; a laser resonant cavity is an L-shaped folding cavity, and the folding angle is 90 degrees; and the curvature radius of a plano-convex total reflection mirror and the curvature radius of an output cavity mirror are designed according to the thermal focal length value of the thermal lens effect of the laser working substance and the structure of the laser resonant cavity. According to the invention, the distribution of pumping light and heat in the laser working substance is more uniform, the thermal lens effect is reduced, the laser output power is improved, the uniformity and stability are better, the laser conversion efficiency is improved, and the beam quality of the output laser is improved.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a single-end pumped Q-switched laser based on doping concentration graded crystals. Background technique [0002] Different from lamp pumps and semiconductor side pumps, end pumping is easy to achieve mode matching between pump light and laser cavity oscillation light, and has the advantages of low laser threshold, compact structure, high slope efficiency, and good beam quality. End pumping is It is more suitable for pumping to generate high repetition rate laser. Due to the existence of factors such as quantum deficit and non-radiative transition, part of the absorbed pump light will be transformed into heat and appear in the laser working substance. When the laser working substance is cooled in a heat sink, a large thermal gradient will be generated, resulting in heat loss. Lens effect, when the pump light propagates in the crystal, the laser intensity decays exponentially, res...

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Problems solved by technology

However, bonded crystals also have some disadvantages. The complex structure makes the processing cycle long and expensive. It is easy to produce grain boundaries and concentration steps at the interface of different concentrations. The laser absorption rate jumps in different concentration segments. There are obvious differences in the pump consistency within the crystal, which affect its laser oscillation characteristics

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