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搭建了以掺镱光纤作为增益、单模光纤提供随机分布反馈的随机光纤激光器,最大输出功率为5.1 W,半峰全宽(FWHM)为0.34nm。以该激光器作为种子源,通过全光纤主振荡功率放大实现了1102 W的激光功率输出,光光效率为78.5%。放大过程中输出激光的FWHM基本保持不变,均方根(RMS)谱宽为1.24nm。为进一步压缩随机光纤种子源的光谱线宽,利用窄谱光纤光栅对随机光纤种子源进行滤波,然后再进行放大,最大输出功率为1093 W,FWHM为0.61nm,均方根谱宽为0.92nm。放大过程中未观察到明显的放大自发辐射与受激布里渊散射现象。
A stochastic fiber laser with random distribution feedback of single-mode fiber with Ytterbium-doped fiber as gain is built. The maximum output power is 5.1 W and the full width at half maximum (FWHM) is 0.34 nm. Using the laser as the seed source, 1102 W laser power output was achieved through the amplification of the main optical power of all the optical fibers, and the optical efficiency was 78.5%. The FWHM of the output laser during the amplification is basically unchanged, with a root mean square (RMS) spectral width of 1.24 nm. In order to further reduce the spectral linewidth of the stochastic fiber seed source, a narrowband fiber grating was used to filter the stochastic fiber seed source and then amplified. The maximum output power was 1093 W, the FWHM was 0.61 nm and the root mean square spectral width was 0.92 nm . No significant amplification of spontaneous and stimulated Brillouin scattering was observed during the magnification.