Doped fibre laser used for reflectometry - has Bragg grating reflector at laser cavity outlet for satisfactory power at test wavelength

摘要

In a laser emission device with a doped fibre (5) amplification cavity (3) and a pump signal generator (1), the cavity outlet reflector is a Bragg reflector which is integrated with the doped fibre (5) and which has a Bragg wavelength within the fibre amplification wavelength band. Pref. the cavity fibre (5) is doped with Er or Tm ions and the Bragg wavelength of the outlet reflector is 1.5-2.1 (pref. 1.6-1.7)mu m.