End-face pump green light laser capable of regulating Q cavity external frequency multiplication actively

Abstract

The invention relates to an end-pumped active Q-regulated outer cavity frequency doubling green-light laser which comprises a laser pumping source, an energy transmission fiber, an optical coupling system, a V-type folding resonant cavity, a laser crystal, an active Q-regulated switch, a steering mirror, a focusing lens, a nonlinear frequency doubling crystal, a collimating mirror and a harmonic wave separating mirror. Quasi continuous basic frequency light with high peak power is produced through an active Q-regulated mode and is output; the output basic frequency light is focalized in the nonlinear frequency doubling crystal placed outside a cavity through the lens and produces fine light spot and high power density of the basic frequency light; and green light is output after the frequency doubling crystal. Compared with an inner cavity frequency doubling mode, the outer cavity frequency doubling mode has better stability, a flexible structure and easy regulation. In the outer cavity frequency doubling green-light laser, the efficiency of conversion from the basic frequency light to the frequency doubling light is more than 50 percent; and the average power of the green light is more than 4.5 W. The outer cavity frequency doubling green-light laser is widely applied in industry processing, scientific research, medical treatment, military affairs and other fields.

Description

technical field [0001] The invention belongs to the technical field of lasers, in particular to an end-pumped active Q-switched extra-cavity frequency-multiplied green laser. It is suitable for applications in laser marking, laser engraving, laser scribing, other laser pump sources, laser medical treatment and scientific research. Background technique [0002] At present, most of the end-pumped green lasers on the market adopt the intracavity frequency doubling method. This method has a compact structure, better beam quality, and higher frequency doubling efficiency. It can use the high power density in the cavity to obtain a larger frequency-doubled green light output, but this method is prone to poor stability caused by longitudinal mode competition. Bad question. Due to the change of the longitudinal mode and polarization state of the fundamental frequency laser oscillating in the cavity, the power of the output light fluctuates greatly, which cannot meet the requiremen...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an end-pumped actively Q-switched extracavity frequency-doubling green laser to solve the problems in the above-mentioned prior art, such as poor stability, large insertion loss and low conversion efficiency.

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