百瓦级全光纤线偏振激光振荡器

100 W Level All-Fiber Linear-Polarization Laser Oscillator

报道了一种全光纤结构的高消光比(PER)线偏振激光振荡器。该光纤激光振荡器的谐振腔由一段双包层掺镱保偏光纤和一对与增益光纤匹配的光栅组成。弯曲损耗使快轴方向上的偏振模和高阶模受到抑制,实现了消光比优于15 d B的线偏振激光输出。最高输出功率为93.2 W,中心波长为1080 nm,光谱半峰全宽(FWHM)约为1.2 nm。增加抽运功率有望进一步提升功率。

An all-fiber linear-polarization laser oscillator of high polarization extinction ratio （PER） is reported. The resonant cavity of the oscillator consists of a Yb-doped polarization-maintaining fiber as well as a pair of FBGs matched with the gain fiber in size. The high-order mode and the polarization mode along the fast axis of the polarization-maintaining fiber is suppressed because of the bend loss, which leads to a linear-polarization laser with high PER of more than 15 dB. The oscillator operates at the center wavelength of 1080 nm with a full width at half maximum （FWHM） about 1.2 nm. The highest output power of 93.2 W is obtained. Increasing pump power may improve output power further.