title: Short cavity single frequency fiber laser for in-situ sensing applications over a wide temperature range.
abstract: A novel Er-doped silica fiber, with heavy Er doping, was specially developed for application to a single frequency fiber laser. Two high temperature-sustainable fiber Bragg gratings, written into Bi-Ge codoped photosensitive fiber, were chosen for the application and spliced to the specialist Er doped silica fiber to form a compact, linear cavity, fiber laser. The fiber laser retained single mode oscillation over a wide temperature range, from room temperature to 400 degrees C. The wavelength of the laser output could be tuned smoothly, without mode hopping being observed, when the temperature was changed. A narrow linewidth of less than 1 kHz was measured at the output of fiber laser and this indicates the potential of the fibre laser sensing system with extremely high sensitivity and resolution over this wide range.
authors.forename: Yonghang
authors.initials: Y
authors.lastname: Shen
authors.forename: Yanqing
authors.initials: Y
authors.lastname: Qiu
authors.forename: Bo
authors.initials: B
authors.lastname: Wu
authors.forename: Weizhong
authors.initials: W
authors.lastname: Zhao
authors.forename: Shuying
authors.initials: S
authors.lastname: Chen
authors.forename: Tong
authors.initials: T
authors.lastname: Sun
authors.forename: Kenneth T V
authors.initials: KT
authors.lastname: Grattan