title: Saturable absorber Q- and gain-switched all-Yb3+ all-fiber laser at 976 and 1064 nm.
abstract: We demonstrate a novel passively pulsed all-Yb3+ all-fiber laser pumped by a continuous-wave 915-nm pump laser diode. The laser was saturable absorber Q-switched at 976 nm and gain-switched at 1064 nm, using the method of mode-field-area mismatch. With a pump power of  105 mW, the laser iteratively produced a 976-nm pulse with an energy of 2.8 μJ and a duration of 280 ns, followed by a 1064-nm pulse with 1.1 μJ and a 430-ns duration at a repetition rate of 9 kHz. A set of rate equations was established to simulate the self-balancing mechanism and the correlation between the Q- and gain-switched photon numbers and the populations of the gain and absorber fibers.
authors.affiliation: Lasers and Photonics Laboratory, Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University, No. 1 University Rd., Tainan City, 70101, Taiwan. tzongyow@mail.ncku.edu.tw
authors.forename: Tzong-Yow
authors.initials: TY
authors.lastname: Tsai
authors.forename: Yen-Cheng
authors.initials: YC
authors.lastname: Fang
authors.forename: Huai-Min
authors.initials: HM
authors.lastname: Huang
authors.forename: Hong-Xi
authors.initials: HX
authors.lastname: Tsao
authors.forename: Shih-Ting
authors.initials: ST
authors.lastname: Lin