Abstract

We report an all-fiber, all-normal dispersion ytterbium (Yb)-doped fiber oscillator mode locked by nonlinear polarization evolution. The mode locking is realized in different pump power regimes by adjusting the polarization controllers. The average output power, pulse energy, and compressed pulse duration varies from 60 to 150 mW, 1.4 to 3.5 nJ, and 350 to 146 fs, respectively, when the pump power to the oscillator is varied from 250 to 500 mW. Particularly at 500 mW pump power, the oscillator generates highly chirped 5 ps duration pulses at 42 MHz that are compressed to a 146 fs duration with a clean temporal profile. The signal-to-noise ratio of the train of mode-locked pulses is 85 dB, indicating stable mode-locking operation. The generalized nonlinear Schrödinger equation is solved numerically to model the passive mode locking in a Yb oscillator, supporting the experimental results. In a chirped pulse Yb amplifier, the signal power is scaled to a 10 W level, and the amplified pulse is compressed to 355 fs duration.

© 2019 Optical Society of America

All-normal-dispersion passive harmonic mode-locking 220  fs ytterbium fiber laser

Junli Wang, Xiangbao Bu, Rui Wang, Long Zhang, Jiangfeng Zhu, Hao Teng, Hainian Han, and Zhiyi Wei
Appl. Opt. 53(23) 5088-5091 (2014)

Chair-like pulses in an all-normal dispersion Ytterbium-doped mode-locked fiber laser

Pradeep K. Gupta, Chandra P. Singh, Amarjeet Singh, Sunil K. Sharma, Pranab K. Mukhopadhyay, and Kushvinder S. Bindra
Appl. Opt. 55(35) 9961-9967 (2016)

All-normal dispersion ytterbium-doped fiber laser mode locked by nonlinear multimode interference

Pradeep K. Gupta, Chandra P. Singh, Pranab K. Mukhopadhyay, and Kushvinder S. Bindra
Appl. Opt. 60(13) 3888-3894 (2021)

All-normal-dispersion nonlinear polarization rotation mode-locked Tm:ZBLAN fiber laser

Masaki Tokurakawa, Hiromu Sagara, and Henrik Tünnermann
Opt. Express 27(14) 19530-19535 (2019)

870  fs, 448  kHz pulses from an all-polarization-maintaining Yb-doped fiber laser with a nonlinear amplifying loop mirror

Shangming Ou, Guanyu Liu, Liang Guo, Zhigang Zhang, and Qingmao Zhang
Appl. Opt. 57(18) 5068-5071 (2018)