540nm all-fiber high-power green fiber laser

Abstract

The invention discloses a 540nm all-fiber high-power green fiber laser, which comprises a semiconductor laser pumping source, a first total reflection fiber grating, a second total reflection fiber grating and a third total reflection fiber grating, a double-clad ytterbium-doped fiber is connected between the first total reflection fiber grating and the second total reflection fiber grating, an intracavity frequency multiplier is connected between the second total reflection fiber grating and the third total reflection fiber grating, the output end of the third total reflection fiber grating is connected with an output tail fiber, and the components are connected in a welding way; and the laser adopts a frequency multiplier cavity structure which consists of an all-fiber structure, the aggregation type intracavity frequency multiplier and the three fiber gratings, and high-stability and high-power green laser output can be realized. The 540nm all-fiber high-power green fiber laser can be widely applied in fields such as laser projection, laser televisions, laser medicine and laser radars, and has the advantages of high beam quality, high frequency-multiplying efficiency, compact structure and stable and reliable performance.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a fiber laser, in particular to a high-power green fiber laser with an all-fiber structure. Background technique [0002] Fiber lasers are developing rapidly due to their small size, high efficiency, good stability, and good beam quality. The green fiber laser near 540nm can be used as an ideal green laser light source for laser projection, laser TV, and laser underwater imaging. At present, the most commonly used method to obtain red laser near 540nm is Yb 3+ : YAG produces 1064nm laser and obtains 532nm green laser after frequency doubling. [0003] The use of nonlinear frequency conversion technology in all-solid-state lasers has achieved good results in obtaining laser technology in the visible light band. When frequency doubling technology is applied to fiber lasers, a contradiction is encountered: the advantage of fiber lasers lies in its all-fiber fusion and ...

AI Technical Summary

Problems solved by technology

In the follow-up study of the intracavity frequency doubler, the inventor found that the length of the self-focusing lens, the length and the refractive index of the frequency doubling crystal will affect the laser distribution inside the intracavity frequency doubler, thereby affecting the intensity of the outgoing laser light. The length of the self-focusing lens in the laser is fixed at 0.23P. The fundamental frequency light is converted into parallel light after the beam expansion of the self-focusing lens, and travels in the form of parallel light in the frequency doubling crystal. The frequency doubling efficiency is relatively high when the nonlinear coefficient of the crystal is high, but the frequency doubling efficiency is relatively low when the nonlinear coefficient of the crystal is low or medium power or the frequency doubling crystal is not very high

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