A unidirectional quantum cascade ring laser

A unidirectional quantum cascade ring laser

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 th...

Full description

Bibliographic Details
Main Authors: Nshii, C., Ironside, Charlie, Sorel, M., Slight, T., Zhang, S., Revin, D., Cockburn, J.
Format: Journal Article
Published: American Institute of Physics 2010
Online Access:http://hdl.handle.net/20.500.11937/19043
Description
Summary: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.

Similar Items