Abstract
We present an overview of our results on the design, material growth,
device characterization, and spectroscopic applications of MOVPE-grown quantum
cascade lasers (QCLs). These devices are capable of room-temperature (RT)
continuous-wave operation and high power emission. The first section focuses
on growth of laser material, device fabrication, and quantum design The second
section discusses RT pulsed operation, in particular the doping dependence
of laser performance and broadband emission. Near-field measurements performed
on the devices' facets correlating lateral modes to device size are also discussed. Section III deals with
continuous-wave high-temperature operation from lasers with different active
region designs, including their spectral characteristics and in the emergence
of coherent phenomena at high power levels. Section IV analyses the
devices thermal dissipation capabilities, while in Section V we report reliability
data. The final section focuses on spectroscopic applications and tunability.
Optofluidic narrow ridge lasers and their application to chemical sensing
are reported along with recent data on a broadband on chip spectrometer consisting
of individually addressable distributed feedback QCLs. Various spectroscopic
techniques and in particular quartz-enhanced photoacoustic absorption spectroscopy
and its use in gas sensing systems are discussed. Finally, optofluidic narrow
ridge lasers and their applications to fluid sensing are presented.
© 2008 IEEE
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