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A unidirectional quantum cascade ring laser

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Authors
Nshii, C.
Ironside, Charlie
Sorel, M.
Slight, T.
Zhang, S.
Revin, D.
Cockburn, J.
Date
2010
Type
Journal Article

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Nshii, C. and Ironside, C. and Sorel, M. and Slight, T. and Zhang, S. and Revin, D. and Cockburn, J. 2010. A unidirectional quantum cascade ring laser. Applied Physics Letters. 97 (23).
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Applied Physics Letters
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Department of Physics and Astronomy
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Abstract

We report on the design, fabrication, and characterization of a unidirectional quantum cascade ring laser operating at a wavelength of around 3.4 µm at 200 K. A unidirectional operation is achieved by incorporating an "S-shaped" crossover waveguide in a manner that it couples light from the counterclockwise direction to the preferred clockwise direction. The ring laser unidirectionality is confirmed by measuring the counterpropagating wave suppression ratio (CWSR) as a function of injection current. At 1.5 times the threshold current, the CWSR is 9 that is 90% of the light is emitted in the favored (clockwise) direction. © 2010 American Institute of Physics.