title: Femtosecond high-power spontaneous mode-locked operation in vertical-external cavity surface-emitting laser with gigahertz oscillation.
abstract: We realize a femtosecond high-power spontaneous mode-locked operation with gigahertz oscillation in a vertical-external cavity surface-emitting laser under the condition of eliminating the internal and external unwanted reflection. We find that the reflectivity of the output coupler has a significant influence not only on the output power but also on the output pulse duration. With an incident pump power of 20 W, we have achieved 2.35 W of average output power with 778 fs pulse duration at a repetition rate of 2.17 GHz. The shortest pulse duration was 654 fs at an average output power of 0.45 W.
authors.affiliation: Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan. yfchen@cc.nctu.edu.tw
authors.forename: Y F
authors.initials: YF
authors.lastname: Chen
authors.forename: Y C
authors.initials: YC
authors.lastname: Lee
authors.forename: H C
authors.initials: HC
authors.lastname: Liang
authors.forename: K Y
authors.initials: KY
authors.lastname: Lin
authors.forename: K W
authors.initials: KW
authors.lastname: Su
authors.forename: K F
authors.initials: KF
authors.lastname: Huang