Abstract

Over the past decade tremendous progress has been made in increasing the power, efficiency and beam quality of diode lasers. However, fibre-coupling while preserving the brightness of edge emitting broad-area diode lasers with typically emission areas of 1×100 µm² still proves to be challenging due to the geometric mismatch between the circular fibre and rectangular aperture of the diode laser. Several techniques have been demonstrated in order to symmetrize the astigmatic beam parameters, such as using segmented prisms or blazed gratings in the Fourier plane a lens [1] or cylindrical lenses as beam twister [2,3].

© 2015 IEEE