Abstract

We frequency doubled the single-frequency beam from an external-cavity tapered laser diode operating at 780  nm in a resonant cavity containing a β-barium borate crystal to generate an output at 390  nm with high efficiency. Output powers as great as 233  mW were obtained, corresponding to an efficiency of 65%/W. The resonant-cavity design was a low-loss three-mirror configuration that provided compensation for astigmatism and coma. The laser diode frequency was locked to the doubling-cavity resonance by use of the Hänsch–Couillaud discrimination technique.

© 1999 Optical Society of America

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