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 808nm tapered grating stabilized external cavity laser as pump source. With 286mW of fundamental
808nm radiation coupled into the resonator, we generate 130mW blue light at 404 nm, resulting in a power conversion
efficiency of 45%.
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.
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