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Observation of optical feedback dynamics in single-mode terahertz quantum cascade lasers: Transient instabilities
- Publication Year :
- 2021
- Publisher :
- American Physical Society, 2021.
-
Abstract
- We provide an experimental evidence of transient instabilities (TIs) in a terahertz (THz) quantum cascade laser (QCL) under optical feedback, in contrast to the widely accepted claim that THz QCLs are ultrastable against feedback. The TIs appear as periodic oscillations in emitted power or terminal voltage of the laser with an increasing oscillation frequency as feedback increases. The absence of relaxation oscillations and low linewidth enhancement factor in THz QCLs makes them a platform uniquely suitable for exploring external-cavity-related dynamics in semiconductor lasers. This work opens a pathway to a THz sensing and imaging modality based on these TIs, which has much reduced complexity compared to existing approaches using laser feedback interferometry.
- Subjects :
- Physics
business.industry
Terahertz radiation
Single-mode optical fiber
Laser
01 natural sciences
010305 fluids & plasmas
law.invention
Semiconductor laser theory
Laser linewidth
Interferometry
law
Cascade
0103 physical sciences
Optoelectronics
010306 general physics
Quantum cascade laser
business
Subjects
Details
- Language :
- English
- ISSN :
- 10502947
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....c3130cb6d1f268b8de8add40dc2c138c