Physics – Condensed Matter – Materials Science
Scientific paper
2007-05-16
Physics
Condensed Matter
Materials Science
PDF file format, 16 pages, 5 figures
Scientific paper
10.1038/nature06208
The development of the semiconductor quantum cascade laser (QCL) [1] has enabled bright coherent sources operating at frequencies between the optical (>100 THz) and electronic (<0.5 THz) ranges opening this frequency region for fundamental science investigations [2-5] as well as for applications [6]. However, detailed information about the internal processes in QCLs and their ultrafast dynamics are needed for their further development towards high output power, longer wavelengths and stable pulsed operation. We introduce a novel approach to study the gain and dynamics of a terahertz (THz) QCL [7] using phase resolved measurements of the stimulated emission. This is enabled by direct recording of the emitted electric field with <100 fs time resolution. For the case of the THz QCL we demonstrate the validity of the quantum mechanical description of the laser. We show for the first time the real bandwidth of the terahertz gain medium, the current dependence of this gain, and the losses associated with the wave propagation in the laser waveguide.
Calligaro Michel
Darmo Juraj
Dhillon Sukhdeep S.
Kroll Josef
Marcadet Xavier
No associations
LandOfFree
Phase resolved measurements of stimulated emission does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Phase resolved measurements of stimulated emission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase resolved measurements of stimulated emission will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-670197