基于八字腔锁模Yb光纤激光器的超连续谱激光源

报道了一种利用八字腔锁模的全光纤化结构的亚纳秒脉冲光纤激光器，其输出脉冲经过光纤化的一级衍射声光调制器实现了可变的脉冲选单以降低脉冲重复频率.从2.78MHz降低重频至93kHz后的激光脉冲经过第二级功率放大，放大斜率效率为68.1%，获得脉冲峰值功率超过25kW的激光输出.以此激励一段经优化后3 m长的Bi离子掺杂的石英光纤和20m普通单模石英光纤，最终获得了波长覆盖1100~2200nm、光谱平坦度优于3dB的稳定超连续谱激光光源输出.

Abstract

An all fiberized novel subns pulsed fiber laser was presented based on the “figureofeight” cavity modelocking. The output pulse train was directed to pass a fiberized acoustooptic modulator based on firstorder diffraction to reduce the pulse repetition rate from 2.78 MHz to 93 kHz by adjustable pulse picking. After the repetition rate decreasing, the peak power of the pulse laser was over 25 kW with the second amplifier, of which slope efficiency was 68.1%. Then the laser was used to excite bismuth doped silica fiber with optimization fiber length of 3m for supercontinuum generation. Finally the obtained laser spanned a spectral range of 1 100~2 200 nm with flatness better than 3 dB.

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钱凯, 魏凯华, 陈滔, 姜培培, 蔡双双, 吴波, 沈永行. 基于八字腔锁模Yb光纤激光器的超连续谱激光源[J]. 光子学报, 2013, 42(5): 521. QIAN Kai, WEI Kaihua, CHEN Tao, JIANG Peipei, CAI Shuangshuang, WU Bo, SHEN Yonghang. All Fiberized Supercontinuum Laser Source Based on “Figure of Eight” Cavity Modelocked Yb Fiber Laser[J]. ACTA PHOTONICA SINICA, 2013, 42(5): 521.

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