Supported by National Natural Science Foundation of China(60878011,61078008);the Program for New Century Excellent Talents in University(NCET-10-0067)。
We present an all-fiber gain-switched thulium (Tm) doped fiber laser operating in the eye-safe region at 1940nm.The fibre Bragg gratings (FBGs) inscribed by phase mask technology are used as cavity mirrors,and the tra...