title: Dual-wavelength rectangular pulse Yb-doped fiber laser using a microfiber-based graphene saturable absorber.
abstract: We reported on the generation of dual-wavelength rectangular pulses in a Yb-doped fiber laser (YDFL) by using a microfiber-based graphene saturable absorber (GSA). The duration of dual-wavelength rectangular pulse could be varied from 1.41 ns to 4.23 ns with the increasing pump power. With a tunable bandpass filter, it was found that the characteristics of the rectangular pulses centered at 1061.8 nm and 1068.8 nm are similar to each other. Moreover, the dual-wavelength switchable operation was also realized by properly rotating the polarization controllers (PCs). The demonstration of the dual-wavelength rectangular pulses from a YDFL would open some applications for fields such as spectroscopy, biomedicine and sensing research.
authors.forename: Nian
authors.initials: N
authors.lastname: Zhao
authors.forename: Meng
authors.initials: M
authors.lastname: Liu
authors.forename: Hao
authors.initials: H
authors.lastname: Liu
authors.forename: Xu-Wu
authors.initials: XW
authors.lastname: Zheng
authors.forename: Qiu-Yi
authors.initials: QY
authors.lastname: Ning
authors.forename: Ai-Ping
authors.initials: AP
authors.lastname: Luo
authors.forename: Zhi-Chao
authors.initials: ZC
authors.lastname: Luo
authors.forename: Wen-Cheng
authors.initials: WC
authors.lastname: Xu