In recent years, sensitive, selective and accurate sensing techniques for ammonia gas
detection have been highly demanded since ammonia is both a commonly utilized gas in …

Mid-infrared quantum cascade lasers are semiconductor injection lasers whose active core
implements a multiple-quantum-well structure. Relying on a designed staircase of …

Quantum cascade lasers (QCL) are the first room temperature semiconductor laser source
for the mid-IR spectral region, triggering substantial development for the advancement of …

In the short space of 15years since their first demonstration, quantum cascade lasers have
become the most useful sources of tunable mid-infrared laser radiation. This Letter …

Quantum cascade (QC) lasers are virtually ideal mid-infrared sources for trace gas
monitoring. They can be fabricated to operate at any of a very wide range of wavelengths …

Infrared (IR) spectroscopic imaging systems are a powerful tool for visualizing molecular
microstructure of a sample without the need for dyes or stains. Table-top Fourier transform …

In this paper we review the progress of the development of mid-infrared quantum cascade
lasers (QCLs) operated in an external cavity configuration. We concentrate on QCLs based …

State-of-the-art quantum-and interband-cascade-based chemical sensors may be effective
new tools for the identification and quantification of trace gases in human breath for clinical …

The design and operating principles of quantum cascade lasers (QCLs) are reviewed along
with recent developments in high-power cw and broadband devices. Cw power levels of …

Laser absorption spectroscopy (LAS) in the mid-infrared region offers a promising new
effective technique for the quantitative analysis of trace gases in human breath. LAS enables …