Miniature optical parametric 1064/1573-nm converter

High efficiency OPO has been designed for converting 1064 micrometers laser radiation into eye-safe region. Conversion efficiency 56.5% and threshold energy 2 mJ (0.06 J.sm2) have been achieved at repetition rate 12.5Hz. The divergence was less than 4 mrad up to 4 thresholds. With 180 mJ pump energy this converter can produce 70mJ output with efficiency 41% and low divergence at repetition rate 2.5Hz.