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高功率单频激光在激光雷达、光谱学、精密测量等领域具有广阔的应用前景.采用中心波长为1064nm、光谱线宽为20kHz、偏振消光比(PER)高于20dB的单频线偏振分布式反馈光纤激光器做种子源(尾纤输出功率约为10mW),利用种子注入主振荡功率光纤放大技术,通过两级级联放大实现了128W高功率单频、线偏振、近衍射极限单模连续激光输出.主放大器光-光效率达到83%,PER高于12dB.采用分段温控技术有效地提高了光纤中的受激布里渊散射(SBS)阈值,实验中未观察到明显的放大自发辐射和SBS现象,进一步提高抽运功率有望获得更高的放大激光输出.
High-power single-frequency laser has broad application prospects in the fields of lidar, spectroscopy, precision measurement, etc. The single-frequency linear polarization distribution with center wavelength of 1064nm, spectral linewidth of 20kHz and polarization extinction ratio (PER) higher than 20dB Feedback fiber laser as the seed source (pigtail output power of about 10mW), the use of seeds injected into the main oscillator power fiber amplification technology, through the two cascade amplification achieved 128W high power single frequency, linear polarization, near diffraction limit single mode continuous laser Output. The main amplifier light - optical efficiency of 83%, PER higher than 12dB. The use of segmented temperature control technology to effectively increase the stimulated Brillouin scattering (SBS) threshold in the fiber, the experiment did not observe a significant amplification spontaneous Radiation and SBS phenomenon, to further improve the pumping power is expected to obtain higher amplification laser output.