High Power Diode Lasers Optimized for Low Loss Smile-insensitive External Spectral Stabilization

P. Crump1, S. Hengesbach2, U. Witte3, H.D. Hoffmann3, G. Erbert1, G. Tränkle1

Published in:

IEEE Photonics Technol. Lett., vol. 24, no. 8, pp. 703-705 (2012).

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High powers can be produced within narrow spectral widths by stabilizing diode lasers with external volume holographic gratings, but this typically introduces additional optical losses. We compare the influence of diode laser design on stabilization performance, comparing devices with super large optical waveguides (4.8ìm) and narrow vertical far fields to reference designs with thinner waveguides (1.6ìm). We find that the use of diode lasers with super larger optical waveguides substantially improves the stabilization performance, with lower losses and wider operation ranges sustained even in the presence of significant (>1ìm) bar smile.

1 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany
2 with the Chair for Laser Technology LLT, RWTH Aachen University, Aachen 52074, Germany
3 Fraunhofer-Institut für Lasertechnik ILT, Aachen 52074, Germany