400 mW external cavity diode laser with narrowband emission at 445 nm

N. Ruhnke , A. Müller, B. Eppich, M. Maiwald, B. Sumpf, G. Erbert, and G. Tränkle

Published in:

Opt. Lett., vol. 39, no. 13, pp. 3794-3797 (2014).

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A high-power external cavity diode laser (ECDL) system with narrowband emission is presented. The system is based on a commercially available high-power GaN laser diode. For the ECDL, a maximum optical output power of 400 mW in continuous-wave operation with narrowband emission is achieved. Longitudinal mode selection is realized by using a surface diffraction grating in Littrow configuration. A spectral width of 20 pm at 445 nm with a side-mode suppression ratio larger than 40 dB is achieved. This concept enables diode laser systems suitable for subsequent nonlinear frequency conversion into the UV spectral range.

Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany

OCIS codes:

(050.1950) Diffraction and gratings : Diffraction gratings; (140.2020) Lasers and laser optics : Diode lasers; (140.4780) Lasers and laser optics : Optical resonators; (140.3425) Lasers and laser optics : Laser stabilization.