Narrow linewidth tunable external cavity diode laser using wide bandwidth filter.

ARC Centre of Excellence for Coherent X-ray Science, School of Physics, The University of Melbourne, 3010, Australia.
The Review of scientific instruments (Impact Factor: 1.52). 02/2012; 83(2):023107. DOI: 10.1063/1.3687441
Source: PubMed

ABSTRACT We demonstrate single mode operation of an external cavity diode laser (ECDL) employing an interference filter with multimode bandwidth for mode selection. A cateye reflector maximizes feedback efficiency and reduces susceptibility to intra-cavity optical misalignment. Narrow linewidths of 26 kHz are observed, and the laser can be tuned over 14 nm using a single 785 nm filter, without alteration of the output beam direction. The cateye reflector and filter allow a mechanically rigid design free of significant mechanical resonances, illustrated by comparison of the frequency noise spectrum with that of a common Littrow ECDL design using a diffraction grating and kinematic mount.

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