Abstract
We report on a lithium triborate (LBO) second harmonic generator delivering up to 6-μW usable power at 397 nm out of 33 mW of a 794-nm diode laser radiation. The LBO crystal is placed in an external ring cavity, compensated for astigmatism and coma, to enhance the fundamental power. Three cavity input couplers were tested for impedance-matching. With the best cavity, the enhancement factor of 1.5 is measured for 794-nm radiation, leading to an enhancement factor of 225 for the 397-nm beam.
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