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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Research Article| February 24 2012
Narrow linewidth tunable external cavity diode laser using wide bandwidth filter
Daniel J. Thompson;
Daniel J. Thompson, Robert E. Scholten; Narrow linewidth tunable external cavity diode laser using wide bandwidth filter. Rev. Sci. Instrum. 1 February 2012; 83 (2): 023107. https://doi.org/10.1063/1.3687441
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