Generation of more than 300 mW diffraction-limited light at 405 nm by second-harmonic generation of a tapered diode laser with external cavity feedback

O.B. Jensen^a, J. Holm^a B. Sumpf^b, G. Erbert^b, P.E. Andersen^a, and P.M. Petersen^a

^a Risø National Laboratory, Optics and Plasma Research Department, Frederiksborgvej 399, Dk-4000 Roskilde, Denmark
^b Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany

Published in:
Proc. SPIE 6455, 645503 (2007).
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Abstract:
We have constructed a blue laser source consisting of a single-frequency tapered diode laser with external cavity feedback that is frequency doubled by a quasi-phase matched KTP (PPKTP) in a bowtie ring cavity and extract more than 360 mW of power at 405 nm. The conversion efficiency from fundamental laser power to second harmonic power is 35%, while it is 64% from coupled fundamental power to extracted blue light. Thermal effects and gray tracking set an upper limit on the amount of generated blue light.

Keywords:
Second harmonic generation, external cavity diode lasers, PPKTP, external cavity second harmonic generation, tapered diode laser.

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