title: Improving the brightness of side pumped power amplifiers by using core doped ceramic rods.
abstract: In side pumped laser head geometries good extraction of energy has to be weighted against diffraction effects of the amplified beam. Beam clipping at the aperture of laser rods can be avoided by using an undoped cladding around the doped core. The wings of e.g. Gaussian beams can be accommodated in the cladding. Phase distortion by the refractive index step of the rod can be compensated by a phase conjugating mirror in double pass configuration. In our proof of principle experiment the brightness of the beam from core doped amplifier rods was shown to be doubled compared to a conventional rod of the same outer diameter.
authors.forename: Alexander
authors.initials: A
authors.lastname: Sträßer
authors.forename: Martin
authors.initials: M
authors.lastname: Ostermeyer