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Q: Quantenoptik und Photonik

Q 6: Halbleiterlaser

Q 6.2: Vortrag

Montag, 13. März 2006, 11:25–11:40, HIV

Extended-Cavity Diode Laser with an external Bragg Mirror* — •Felix Kroeger, Ingo Breunig, and Karsten Buse — Universität Bonn, Physikalisches Institut

Laser diodes in the red and near-infrared spectral range are cheap and compact light sources for various applications. There are well-known techniques to reduce the linewidth of diode lasers by wavelength-selective feedback from a surface grating, the so-called Littrow or Littman configurations. In our setup we use a volume holographic grating (Bragg mirror) with normal incidence. The maximum reflectivity is about 95 % at 808.0 nm, and the bandwidth is 0.4 nm. With this Bragg reflector an optical feedback into an anti-reflection-coated laser diode is provided. This way we are building a compact extended-cavity diode laser system with an emission linewidth of approximately 25 MHz and a long-term stability of more than 7 hours. The optimum reflectivity and geometry of the outcoupling mirror as well as the possible modehop-free tuning range are currently under investigation.

*Financial support by the Deutsche Forschungsgemeinschaft (FOR 557) and by the Deutsche Telekom AG is gratefully ackknowledged.