SINGLE POLARIZATION, YB3+-DOPED FIBRE AMPLIFIER DESIGN FOR CARS

Using finite element theory an Yb3+- doped fibre amplifier will be designed for Coherent Anti-Stokes Raman Scattering (CARS) applications at similar to 1 mu m. A tunable (750-850nm) broad band semiconductor laser will be employed to obtain the required seed. Both counter and co-propagating pump schemes will be used in order to secure and analyze population inversion as a function of fibre length. A double clad, octagonal shape 10 mu m core with a 25000 ppm tailored profile concentration is used as the basis for our design development. A 1W@1064nm high-intensity (I approximate to 3.2x10(9) W/m(2)), quasi diffraction-limited, with an M-2 approximate to 1 and S/N ratio >30dB, temporally stable behaviour and suitable RIN will be demonstrated after full simulation using VLad. Full optical characterization results will be included in this work.