Beam quality dependent SHG using edge-emitting lasers and a 50 mm bulk PPLN crystal

摘要

In this paper we present a study of the single pass normalized second harmonic generation (SHG) conversion efficiency as a function of the beam propagation factor M~2 and the beam diameter in the lateral and vertical direction. It can be shown that an increase in M~2 results in dramatic changes for the optimal focusing conditions, in comparison to the SHG with a Gaussian beam. Based on the results of the measurements we developed a model to simulate the focusing conditions for partial coherent beams.