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Origin of terminal voltage variations due to self-mixing in terahertz frequency quantum cascade lasers
- Source :
- Optics Express. 24:21948
- Publication Year :
- 2016
- Publisher :
- The Optical Society, 2016.
-
Abstract
- We explain the origin of voltage variations due to self-mixing in a terahertz (THz) frequency quantum cascade laser (QCL) using an extended density matrix (DM) approach. Our DM model allows calculation of both the current–voltage (I–V) and optical power characteristics of the QCL under optical feedback by changing the cavity loss, to which the gain of the active region is clamped. The variation of intra-cavity field strength necessary to achieve gain clamping, and the corresponding change in bias required to maintain a constant current density through the heterostructure is then calculated. Strong enhancement of the self-mixing voltage signal due to non-linearity of the (I–V) characteristics is predicted and confirmed experimentally in an exemplar 2.6 THz bound-to-continuum QCL.
- Subjects :
- Physics
business.industry
Terahertz radiation
Physics::Optics
Optical power
Field strength
02 engineering and technology
021001 nanoscience & nanotechnology
Laser
01 natural sciences
Atomic and Molecular Physics, and Optics
law.invention
Semiconductor laser theory
010309 optics
Photomixing
Optics
law
Cascade
0103 physical sciences
Optoelectronics
0210 nano-technology
business
Quantum cascade laser
Subjects
Details
- ISSN :
- 10944087
- Volume :
- 24
- Database :
- OpenAIRE
- Journal :
- Optics Express
- Accession number :
- edsair.doi.dedup.....456b53c4d273137143a249f6d40acbb2