Abstract
The influence of the pump intensity profile on the performance of a mid-IR ZGP RISTRA OPO at 6.45 µm is studied for a flat-top pump profile and compared to a Gaussian pump distribution at the same pump peak fluence of 0.81 J/cm2. Due to a coherent beam transformation a flat-top pump beam with a plane wavefront and excellent beam quality of M2≈1.25 is generated. The output of up to 5 mJ pulse idler energy (0.5 W average idler power) is identical in both cases, showing that flat-top pumping allows a reduction of the OPO crystal volume by 55 % while still maintaining a good output beam quality of M2<2.7 for the idler and M2<2.5 for the signal. The experimental results are compared to the SNLO RISTRA model and the limitations of the model are discussed.
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