All-fiber narrow-linewidth nanosecond tunable green laser

Abstract

The invention discloses an all-fiber narrow-linewidth nanosecond tunable green laser. The all-fiber narrow-linewidth nanosecond tunable green laser comprises a laser seed source, a two-stage single-mode fiber laser amplifier, a four-stage multimode fiber laser amplifier and a second harmonic device, wherein the laser seed source emits narrow-linewidth nanosecond seed light with continuously tunable repetition frequency and pulse width, the two-stage single-mode fiber laser amplifier is used for preliminarily amplifying the seed light, and the four-stage multi-mode fiber laser amplifier is used for further amplifying the power of the seed light. The second harmonic device receives the fundamental frequency light obtained after multistage power amplification, and performs frequency multiplication processing on the fundamental frequency light to obtain green laser; the narrow-linewidth nanosecond seed light with continuously tunable repetition frequency and pulse width is subjected to multi-stage power amplification through a multi-stage active optical fiber to obtain the fundamental frequency light, finally, the fundamental frequency light is subjected to frequency multiplication through a second harmonic device to obtain the green laser, and finally, the all-fiber narrow-linewidth nanosecond tunable green laser is realized.

Description

technical field [0001] The invention relates to the field of green lasers, in particular to an all-fiber narrow-linewidth nanosecond tunable green laser. Background technique [0002] Green lasers are widely used in material processing, medical treatment, laser projection and pump light parametric amplifiers and other fields. At present, the main way to obtain green laser is to emit laser light through a solid-state laser, and then obtain the laser frequency doubling through a nonlinear crystal. Although solid-state lasers have produced green lasers with a power of more than 100 watts, the beam quality of these lasers is M 2 >10, and the tuning range is limited. [0003] In recent years, fiber lasers have attracted widespread attention due to their high beam quality, good stability, large heat dissipation, and wide tunable range. It has been widely used in spectral measurement and precision measurement. Based on the advantages of narrow linewidth fiber lasers in volume...

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Problems solved by technology

[0004] The present invention aims to propose an all-fiber narrow linewidth nanosecond tunable green laser, which overcomes the problems of wide linewidth, small tunable range and complex structure of traditional green lasers

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