The first long wavelength infrared quantum cascade (QC) disk laser operating up to a wavelength as long as 11.6 μm is reported. In the present structure, based `two-well vertical transition', the microcavity regime of the QC disk laser with both an increase in the emission wavelength and a decrease of the disk size is described. The most important feature accompanying the size-reduction of the laser cavity is the reduction of the mode density, which is described by the so called beta factor. Finally, based on a two-level rate equation model and on precise measurements of light output to current characteristics, the threshold characteristics and the direct measurement of β in a true microcavity QC laser is discussed.
|Number of pages
|Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS
|Published - Jan 1 1997
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering