The use of mid-infrared tunable quantum cascade (QC) lasers for gas-sensing applications is investigated. In QC lasers, the upper and lower laser levels are produced in the conduction band of a multiple quantum well structure. Thin layers of InGaAs, as wells, are alternated with thin layers of AlInAs, the barriers. The layers are so thin that the allowed energy levels of the electrons are noticeably separated so that their separation exceeds the natural broadening of the individual states.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering