| 主权项 |
1. A high power amplifier waveguide system for amplifying an optical signal comprising:
a) a diode bar array pump laser which operates at a wavelength λpump and with a pump power exceeding 100 W; b) a coupling device; c) a cladding pumped amplifier waveguide; d) an output delivery fibre;
the cladding pumped amplifier waveguide comprising
a signal core adapted to guide an optical signal at a signal wavelength, λsignal, the signal core having an effective refractive index ncore-1, wherein the signal core comprises at least one photosensitive region comprising at least one photosensitive element, wherein the photosensitive element is selected from the group of Germanium (Ge), Boron (B), or combinations thereof;an inner cladding region for guiding pump light, the inner cladding region comprising a first inner cladding surrounding the signal core and having an effective refractive index ninner-clad-1, the first inner cladding comprising a material doped with at least one rare earth element, the rare earth element being Ytterbium (Yb) and the first inner cladding material is down-doped with an index lowering element selected from the group of Fluorine (F), Boron (B), or combinations thereof, wherein said first inner cladding comprises at least one rare earth doped silica region;where the wavelength λpump is resonant with an absorption band of the rare earth element, where ncore-1>ninner-clad-1, and where an area of the signal core is larger than 50 μm2, wherein the signal wavelength, λsignal, of the optical signal is within the interval from 1050 nm to 1090 nm; andwherein an overlap of the optical signal to the at least one rare earth doped silica region is less than or equal to 25%. |
