Title :
A cladding-pumped fiber laser with pump-reflecting inner-cladding Bragg grating
Author :
Baek, Seungin ; Soh, Daniel B S ; Jeong, Yoonchan ; Sahu, Jayanta K. ; Nilsson, Johan ; Lee, Byoungho
Author_Institution :
Optoelectronics Res. Centre, Univ. of Southampton, UK
Abstract :
A fiber Bragg grating (FBG) was inscribed in the inner cladding of a double-clad fiber, in order to reflect, and thus, double-pass, the pump radiation in a cladding-pumped fiber laser. The effective pump reflectivity of the inner-cladding FBG was ∼46.4%. This increased the slope efficiency of a Yb-doped cladding-pumped fiber laser by up to 8.5%, and the output power increased by 45% with a 3-W pump source. The FBG provides stable and robust pump reflection, while leaving the fiber end free, for example, so that a signal transmission fiber can be spliced to the double-clad fiber.
Keywords :
Bragg gratings; fibre lasers; optical fibre cladding; optical pumping; reflectivity; visible spectra; 3 W; cladding-pumped fiber laser; double-clad fiber; fiber Bragg grating; pump absorption; pump reflection; pump reflectivity; pump-reflecting inner-cladding; signal transmission fiber; Bragg gratings; Fiber gratings; Fiber lasers; Laser excitation; Optical reflection; Power generation; Power lasers; Pump lasers; Reflectivity; Robustness;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2003.823135