A unidirectional quantum cascade ring laser

Nshii, C.C., Ironside, C.N., Sorel, M., Slight, T.J., Zhang, S.Y., Revin, D.G. and Cockburn, J.W. (2010) A unidirectional quantum cascade ring laser. Applied Physics Letters, 97(23), p. 231107. (doi:10.1063/1.3524200)

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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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sorel, Professor Marc and Ironside, Professor Charles and Slight, Dr Thomas
Authors: Nshii, C.C., Ironside, C.N., Sorel, M., Slight, T.J., Zhang, S.Y., Revin, D.G., and Cockburn, J.W.
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Physics Letters
ISSN:0003-6951
Published Online:07 December 2010

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