Novel low-loss 3-element ring resonator for second-harmonic generation of 808 nm into 404 nm using periodically poled KTP

J. Holm^a, O.B. Jensen^a, B. Sumpf^b, G. Erbert^b, S. Andersson-Engels^a, 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, 645504 (2007).
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Abstract:
We present a novel ring resonator for second harmonic generation consisting of only two spherical mirrors and a refractive element. In our work we use periodically poled KTP as a nonlinear material for generating the second harmonic using an 808 nm tapered grating stabilized external cavity laser as pump source. With 286 mW of fundamental 808 nm radiation coupled into the resonator, we generate 130 mW blue light at 404 nm, resulting in a power conversion efficiency of 45%.

Keywords:
Optical resonators, tapered lasers, second harmonic generation, KTP

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