具有极宽光谱的被动谐波混合锁模光纤激光器。

Passive harmonic hybrid mode-locked fiber laser with extremely broad spectrum.

作者信息

Li Xing, Zou Weiwen, Chen Jianping

出版信息

Opt Express. 2015 Aug 10;23(16):21424-33. doi: 10.1364/OE.23.021424.

DOI:10.1364/OE.23.021424

Abstract

We demonstrate a harmonic mode-locking Erbium-doped fiber laser which is cooperatively mode-locked by nonlinear polarization evolution (NPE) and semiconductor saturable absorber mirror (SESAM). Via effective dispersion and nonlinearity optimization, 8th harmonic at a repetition rate of 666.7 MHz is obtained. The output pulses has a full spectrum width at half maximum (FWHM) of 181 nm and duration of 218 fs. The pulses are compressed to 91 fs by external chirp compensation. The average power of the direct output pulse at an available pump power of 1.5 W is 136 mW, which exhibits a single-pulse energy of 0.2 nJ. The cavity super-mode suppression is up to 60 dB and the signal-to-noise ratio of the 8th harmonic is over 75 dB.

摘要

我们展示了一种通过非线性偏振演化（NPE）和半导体可饱和吸收镜（SESAM）协同锁模的谐波锁模掺铒光纤激光器。通过有效的色散和非线性优化，获得了重复频率为666.7 MHz的八次谐波。输出脉冲的半高全宽（FWHM）为181 nm，持续时间为218 fs。通过外部啁啾补偿，脉冲被压缩至91 fs。在可用泵浦功率为1.5 W时，直接输出脉冲的平均功率为136 mW，单脉冲能量为0.2 nJ。腔超模抑制高达60 dB，八次谐波的信噪比超过75 dB。