Yin Ke, Li Lei, Yao Jinmei, Zhang Bin, Hou Jing
Opt Lett. 2015 Oct 15;40(20):4787-90. doi: 10.1364/OL.40.004787.
An ultra-flat high-power short-wave infrared super-continuum (SC) source generated in an all-fiber thulium-doped fiber amplifier (TDFA) is reported. The SC had a high-spectral flatness with a 10 dB spectral bandwidth spanning from 1970 to 2431 nm and a power spectral density >23 dBm/nm. The output SC beam had Gaussian-shape profiles with a maximum average power of 101.6 W, a SC pulse repetition rate of 2 MHz, and a temporal duration of ∼5 ns. Benefiting from the high duty cycle of the 2 μm seed pulses, the power conversion efficiency from the 793 nm pump light to the maximal SC output power in the TDFA was as high as 35.4%, and the slope efficiency of the TDFA was linearly fitted to be 36.5%. Long-term high-power operation of the SC source showed its outstanding temporal stability. To the best of the authors' knowledge, the results obtained in this Letter represent a new power record for ultra-flat SC in the short-wave infrared region.
报道了一种在全光纤掺铥光纤放大器（TDFA）中产生的超平坦高功率短波红外超连续谱（SC）源。该超连续谱具有高光谱平坦度，10 dB光谱带宽范围为1970至2431 nm，功率谱密度>23 dBm/nm。输出的超连续谱光束具有高斯形状分布，最大平均功率为101.6 W，超连续谱脉冲重复率为2 MHz，时间宽度约为5 ns。受益于2 μm种子脉冲的高占空比，在TDFA中从793 nm泵浦光到最大超连续谱输出功率的功率转换效率高达35.4%，TDFA的斜率效率线性拟合为36.5%。超连续谱源的长期高功率运行显示出其出色的时间稳定性。据作者所知，本文所获得的结果代表了短波红外区域中超平坦超连续谱的新功率记录。
