Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.75: Poster

Tuesday, March 9, 2010, 16:00–19:00, Lichthof

Concept of a second order Littrow external cavity diode laser — •Björn Hemb, Michael Britzger, Daniel Friedrich, Maximilian Wimmer, André Thüring, Karsten Danzmann, and Roman Schnabel — Institut für Gravitationsphysik, Leibniz Universität Hannover und Max-Planck-Institut für Gravitationsphysik (Albert- Einstein-Institut) Callinstrasse 38 D-30167 Hannover

Optical feedback for laser diodes is typically realised with gratings in first order Littrow or Littman configurations. The latter generates a better frequency selection, but includes a loss channel for the light power. An alternative concept is based on a so-called 3-port-grating that provides three diffraction orders. The external cavity is mounted in second order Littrow configuration. Hence the external cavity is assembled perpendicular to the grating surface. The first diffraction order serves for coupling into the external cavity.

We present a detailed analysis of the applicability of dieletric 3-port reflection gratings for external cavity optical feedback of laser diodes. The design is intended to engender optical feedback without any loss channel and with minor complexity.