Intracavity cascade pump laser based on composite structure gain medium

Abstract

The invention discloses an intracavity cascade pump laser based on a composite structure gain medium. A thermal bonding technology is adopted to prepare a composite structure gain medium comprising an intermediate gain medium and a target gain medium, and a closed intra-cavity cascade pumping resonant cavity can be independently formed. According to the integrated structure, secondary pump light is completely restrained in the composite gain medium, the secondary pump light passes through the target gain medium for multiple times and is fully absorbed by the target gain medium, and high pump absorption efficiency and good pump uniformity are achieved. The gain medium of the composite structure is excellent in thermal management performance, thermal deposition in the gain medium can be effectively transferred, and high-power laser output can be obtained. In addition, the pumping light and the output laser in the structure are in different directions, the output laser is prevented from passing through a pumping end face area with a serious heat effect, and the beam quality of the output laser is further improved. The laser also has the advantages of compact structure, high reliability, simple light path and easy adjustment.

Description

technical field [0001] The invention relates to the field of lasers, and proposes a novel intracavity cascaded pump laser based on a composite structure gain medium. The laser is based on a composite structure gain medium prepared by the diffusion bonding method. It has excellent thermal management performance, compact structure, high pump absorption efficiency, and good pump uniformity. It can obtain high-power, high-beam-quality laser output. Background technique [0002] Solid-state lasers have broad application prospects in basic research, material processing and manufacturing, medical treatment, national defense and other fields. The technology to achieve high power and high beam quality laser output is one of the key points in the field of solid-state laser research at home and abroad. [0003] For the output of some specific wavelengths (such as ultraviolet, mid-infrared and THz bands), it is difficult to obtain the laser output of the target wavelength by direct pum...

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Problems solved by technology

However, due to the use of discrete components, the complex structure will bring more device losses; in addition, the traditional intracavity pumping structure is an open structure, in order to achieve intracavity pumping , the pump light is required to be in the same direction as the target output laser, so that the output laser will pass through the incident end face of the pump light with severe thermal effects, which greatly limits the beam quality of the output laser [3]

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