44.6 fs pulses from a 257 MHz, mode-locked non-PM Er-doped fiber laser based on biased nonlinear amplifying loop mirror (NALM) is reported. The output power is 104 mW and the single pulse energy is 0.4 nJ. The minimum pulse duration of the direct output is 44.6 fs, which is the shortest in this kind of laser.

Gao Wanli, Liu Guanyu, Zhang Zhigang. 44.6 fs pulses from a 257 MHz Er:fiber laser mode-locked by biased NALM[J]. Chinese Optics Letters, 2018, 16(11): .  复制并引用该论文