HIGH POWER RAMAN-BASED FIBER LASER SYSTEM AND METHOD OF OPERATING THE SAME

摘要

A fiber Raman laser is configured with a microstructured double clad passive fiber whic has an inner cladding receiving and guiding a high intensity pump light. The double-cla passive fiber further has a core surrounded by the inner cladding and an outer cladding. An arrangement of air holes is configured to define the inner, waveguiding cladding so that an NA of the latter varies between about 0.25 - 0.9 allowing this to reduce the diameter of the inner cladding. The passive fiber is characterized by a substantial overla between the pump light and 1st stokes in the core and further includes an absorber operative to substantially suppress the signal light at the 2^nd stokes so that the Ge-doped fiber outputs a SM, bright radiation at up to kW levels.