1 W at 531 nm generated in a ppMgO:LN planar waveguide by means of frequency doubling of a DBR tapered diode laser

Published in:
Proc. SPIE, vol. 7917, no. 791703 (2011).
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Abstract:
In this work, we investigate experimentally second-harmonic generation (SHG) in a periodically poled 5 %mol MgO doped LiNbO₃ (ppMgO:LN) planar waveguide. As a pump source a 6 mm long distributed Bragg reflector (DBR) tapered diode laser is applied. The laser emits nearly diffraction limited, spectrally single-mode continuous-wave radiation at 1063 nm and is therefore well suited for the SHG process. With the applied lens system in a bench-top experiment a coupling efficiency into the planar waveguide of 73 % is reached. A maximal SH power of 1.07 W is generated at an opto-optical and electro-optical conversion efficiency of 26 % and 8.4 %, respectively. This is, to the best of our knowledge, the highest power level generated in a waveguide structure by means of frequency doubling of diode laser radiation in a single-pass configuration.

Keywords:
distributed Bragg reflector, high-power diode laser, planar waveguide, frequency doubling, second-harmonic generation.

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