title: Passively Q-switched Er3+-doped fiber lasers using colloidal PbS quantum dot saturable absorber.
abstract: We report on the demonstration of a passively Q-switched 1.55 µm fiber laser utilizing a colloidal PbS quantum dot (QD) thin film as a saturable absorber. Colloidal PbS QD films have several features that are advantageous in passively Q-switched fiber laser operation, including a large operation wavelength range, cost-effectiveness, and a low saturable absorption intensity. We conducted thorough material and optical studies to verify the advantages of PbS QDs in Q-switched laser operation and successfully generated 801 nJ pulses with a 24.2 kHz repetition rate. To the best of our knowledge, the developed Q-switched fiber laser is the first based on colloidal PbS QDs.
authors.forename: Yin-Wen
authors.initials: YW
authors.lastname: Lee
authors.forename: Chien-Ming
authors.initials: CM
authors.lastname: Chen
authors.forename: Chia-Wei
authors.initials: CW
authors.lastname: Huang
authors.forename: Shih-Ken
authors.initials: SK
authors.lastname: Chen
authors.forename: Jhang-Rong
authors.initials: JR
authors.lastname: Jiang