Medium and small power LD parallelly pumped high-power green laser

Abstract

The invention discloses a medium and small power LD parallelly pumped high-power green laser, which comprises a resonant cavity, frequency doubling crystals and parallelly connected end-pumped lasers, wherein the frequency doubling crystals are located in the resonant cavity so as to form a frequency doubling resonant cavity, each end-pumped laser comprises an end-pumped device formed by a pumping source, a coupling mirror and a laser crystal, a sub resonant cavity formed by a first totally reflecting mirror and a second totally reflecting mirror, a Q-switch arranged in the sub resonant cavity and a first output mirror used for reflecting and outputting fundamental frequency pulse laser, an included angle between an optical axis of each end-pumped laser and the first output mirror inside is 45 degrees, and the fundamental frequency pulse laser outputted by each first output mirror generates frequency doubling green laser after passing through the frequency doubling crystal, and the frequency doubling green laser is combined into a beam in the resonant cavity and then outputted from a second output mirror of the resonant cavity. The medium and low power LD parallelly pumped high-power green laser can acquire high laser power output and high beam quality.

Description

Technical field [0001] The invention relates to a laser, in particular to a high-power green laser that is pumped in parallel by medium and small power LDs. Background technique [0002] The LD-pumped high-power solid-state green laser has the advantages of high efficiency, good output light quality, controllable operation, small size, high energy and long life, so it has a wide range of applications in many fields, such as laser materials Processing, pumping sources of tunable lasers, laser detection, environmental remote sensing detection, and light sources for large-scale laser demonstrations have become hot spots in international research and development. Especially in recent years, the green laser processing system of ceramics, glass, PCB boards, solar cells and other materials that have gradually emerged in recent years has made LD-pumped high-power solid-state green lasers widely used in industrial fields. [0003] For LD-pumped solid-state lasers, the most fundamental way ...

AI Technical Summary

Problems solved by technology

The main disadvantage of multi-rod series connection is that as the power increases, the thermal lens effect of each laser crystal rod and the frequency doubling crystal will make the resonator unstable. As the pump current increases, the output power will decrease instead. At the same time, this method assumes that each thermal lens components have the same thermal characteristics

However, for the actual laser system, there are differences in the thermal characteristics of each rod, which leads to changes in the matching coupling characteristics between rods, and also affects the stability of the laser system.

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