Room temperature quantum cascade lasers with 22% wall plug efficiency in continuous-wave operation
Abstract
We report the demonstration of quantum cascade lasers (QCLs) with improved efficiency emitting at a wavelength of 4.9 µm in pulsed and continuous-wave (CW) operation. Based on an established design and guided by simulation, the number of QCL-emitting stages is increased in order to realize a 29.3% wall plug efficiency (WPE) in pulsed operation at room temperature. With proper fabrication and packaging, a 5-mm-long, 8-µm-wide QCL with a buried ridge waveguide is capable of 22% CW WPE and 5.6 W CW output power at room temperature. This corresponds to an extremely high optical density at the output facet of ∼35 MW/cm2, without any damage.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 27, 2020
- Source ID
- 10.1364/oe.394916
Entities
People
- Donghai Wu
- F. Wang
- M. Razeghi
- S. Slivken
Organizations
- Office of Naval Research