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)

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