title: Multiwavelength picosecond and single wavelength femtosecond pulses emission in a passively mode-locked fiber laser using a semiconductor saturable absorber mirror and a contrast ratio tunable comb filter.
abstract: We propose and demonstrate a highly flexible fiber laser capable of generating stable multiwavelength picosecond and single wavelength femtosecond pulses by using a semiconductor saturable absorber mirror and a contrast ratio tunable comb filter. In the multiwavelength lasing regime, up to 11-wavelength stable mode-locked pulses in 3 dB bandwidth with a channel spacing of 0.8 nm were obtained. While in the single wavelength with broadband spectrum lasing regime, the fiber laser emitted 576 fs soliton pulse. Through changing the contrast ratio of the comb filter, the conversion between the multiwavelength picosecond and single wavelength femtosecond pulsed operations could be efficiently achieved.
authors.affiliation: Key Laboratory of Photonic Information Technology of Guangdong Higher Education Institutes, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou, Guangdong 510006, China. zcluo@scnu.edu.cn
authors.forename: Zhi-Chao
authors.initials: ZC
authors.lastname: Luo
authors.forename: Ai-Ping
authors.initials: AP
authors.lastname: Luo
authors.forename: Wen-Cheng
authors.initials: WC
authors.lastname: Xu