Pulse Energy Scaling by Optimizing Cavity Management in Low Repetition Rate Erbium-Doped Fiber Femtosecond Lasers
Pulse Energy Scaling by Optimizing Cavity Management in Low Repetition Rate Erbium-Doped Fiber Femtosecond Lasers
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DOI：
10.1109/jqe.2013.2249495
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发表时间：
2013-02
影响因子：
2.5
通讯作者：
J. Peng;L. Zhan;S. Luo;Q. Shen
中科院分区：
文献类型：
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作者：
J. Peng;L. Zhan;S. Luo;Q. Shen
实验证明了在全光纤腔优化的掺铒激光器中直接产生51 nJ， 284 fs的超短脉冲，重复频率为2.68 MHz。激光器的转换效率约为10%。该激光器通过非线性偏振旋转实现锁模。这样的高能量和超短持续时间得益于使用大输出比（90%）、延长腔长、色散管理和双向高功率泵浦激光器。通过使用色散补偿光纤进一步降低激光的净色散，可以将脉冲持续时间缩短到160 fs。此外，实验证明了激光中不可见滤光片对光谱宽度的影响。
We experimentally demonstrate direct generation of 51 nJ, 284-fs ultrashort pulses in an all-fiber cavity-optimized erbium-doped laser with a low repetition rate of 2.68 MHz. The conversion efficiency of the laser is about 10%. The laser is mode-locked by nonlinear polarization rotation. Such high energy and ultrashort duration benefits from using large output ratio (90%), elongating the cavity length, dispersion management, and bidirectional high-power pumping in the laser. Further decreasing the net dispersion of the laser by using a dispersion-compensated fiber can reduce the pulse duration to 160 fs. In addition, variation of spectral width due to an invisible filter in the laser is experimentally demonstrated.