Single-mode quantum cascade lasers based on a folded Fabry-Perot cavity
Abstract
We demonstrate single-mode quantum cascade lasers employing a folded Fabry-Perot cavity consisting of two straight sections connected by a semicircular section in a “hairpin” shape. These folded cavity lasers emitting at ∼4.5 μm are fabricated with identical processes as those for plain Fabry-Perot ridge lasers, and show a strong suppression of the comb of Fabry-Perot cavity modes, leading to tunable single-mode emission with up to 27 dB side mode suppression ratio and a single-mode operating current range of up to 60% above the threshold current when operated in pulsed mode; single-mode emission is achieved from 80 to ∼240 K.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 07, 2011
- Source ID
- 10.1063/1.3554757
Entities
People
- Claire F. Gmachl
- Jen-yu Fan
- Peter Q. Liu
- Xiaojun Wang
Organizations
- Defense Advanced Research Projects Agency
- National Science Foundation
- Princeton University