Pumping gain medium with zigzag side surface and laser system

Abstract

The invention provides a pumping gain medium with a zigzag side surface and a laser system, the gain medium is in the shape of a prismatic table, the side surface of the gain medium is a pumping surface for receiving pumping light, the lower bottom surface of the gain medium is a laser emergent surface, the upper bottom surface of the gain medium is a conduction cooling surface, the gain medium comprises a doped region and an undoped region, the doped region is located in the central region of the gain medium in the width direction, the undoped region is located in the edge region of the gain medium in the width direction, and the undoped region and the doped region are spliced through bonding. According to the pumping gain medium with the Z-shaped side surface, the pumping light enters from the side surface of the medium at a certain angle and is transmitted in the medium in a Z-shaped path, so that the length of an absorption path of the pumping light in the medium is increased, the absorption efficiency of the pumping light is improved, the pumping light has certain superposition, and the absorption efficiency of the pumping light is improved. And the pump light incident from multiple side surfaces is also superposed in the central area, so that the distribution uniformity of the whole pump light in the medium is improved.

Description

technical field [0001] The invention relates to the technical field of solid lasers, in particular to a side zigzag pump gain medium and a laser system. Background technique [0002] The common pumping methods in all solid-state laser systems are end pumping and side pumping. The pumping light of the end pumping method is basically consistent with the laser transmission direction, the mode matching is good, and the light-to-light conversion efficiency is high; In the pumping mode, the pump light is perpendicular to the laser transmission direction, and the light-to-light conversion efficiency is relatively low. [0003] The shape of the laser gain medium commonly used in the all-solid-state laser system is rod-shaped, slab-shaped, and sheet-shaped. Under high-power pumping conditions, the temperature gradient direction of the rod-shaped gain medium is perpendicular to the laser transmission direction, and the thermal effect is obvious; the slab and sheet The thermal gradien...

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Problems solved by technology

However, higher doping concentrations are prone to disadvantages such as concentration quenching, uneven gain, and obvious parasitic oscillations.

[0005] In the end-face (narrow face) pumped thin-sheet laser system, due to the narrow pump face, it is difficult to couple the large-area pump light under high-power pumping conditions, which reduces the coupling efficiency; at the same time, it is not easy to achieve uniform pumping, and the temperature The phenomenon of uneven distribution and uneven gain reduces the beam quality of the output laser; secondly, the high pump power density is prone to absorption saturation and gain saturation, which reduces the energy utilization rate

[0006] In solid-state laser systems pumped by laser diodes, increasing the number of diodes and multi-directional pumping are often used to improve pumping uniformity. The pumping structure is complex, and it is difficult to achieve uniform distribution of pump light in the gain medium, reducing the laser beam quality

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