title: 716  nm deep-red passively Q-switched Pr:ZBLAN all-fiber laser using a carbon-nanotube saturable absorber.
abstract: We experimentally demonstrated a compact single-wall carbon-nanotube (SWNT)-based deep-red passively Q-switched Pr3+-doped ZBLAN all-fiber laser operating at 716 nm. A free-standing SWNT/polyvinyl alcohol composite film embedded between a pair of fiber connectors was employed as a saturable absorber (SA). The deep-red Q-switched operation is attributed to the combination of implementing a pair of fiber end-facet mirrors to achieve the linear laser resonator and incorporating a SWNT-SA into the cavity as a Q-switcher. Stable short-pulse generation with a duration of 2.3 μs was realized. When gradually increasing the incident pump power, the pulse repetition rate can be linearly tuned from 32.6 to 86.5 kHz, corresponding to a maximum average output power of 1.5 mW and the highest single-pulse energy of 18.3 nJ. To the best of our knowledge, this is the first demonstration of SWNT-based SA for a Q-switched laser at a deep-red wavelength ∼716  nm.
authors.forename: Wensong
authors.initials: W
authors.lastname: Li
authors.forename: Tuanjie
authors.initials: T
authors.lastname: Du
authors.forename: Jinglong
authors.initials: J
authors.lastname: Lan
authors.forename: Changlei
authors.initials: C
authors.lastname: Guo
authors.forename: Yongjie
authors.initials: Y
authors.lastname: Cheng
authors.forename: Huiying
authors.initials: H
authors.lastname: Xu
authors.forename: Chunhui
authors.initials: C
authors.lastname: Zhu
authors.forename: Fengqiu
authors.initials: F
authors.lastname: Wang
authors.forename: Zhengqian
authors.initials: Z
authors.lastname: Luo
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Cai