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 …

Infrared laser-absorption spectroscopy (IR-LAS) sensors play an important role in
diagnosing and characterizing a wide range of combustion systems. Of all the laser …

We review the most recent technological and application advances of quantum cascade
lasers, underlining the present milestones and future directions from the Mid-infrared to the …

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

Optical imaging techniques are ubiquitous for the resolution of non-uniformities in gas flows.
Planar imaging techniques such as laser-induced fluorescence are well established and …

An ultra-sensitive and selective quartz-enhanced photoacoustic spectroscopy (QEPAS)
sensor platform was demonstrated for detection of carbon monoxide (CO) and nitrous oxide …

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 …

Quantum cascade lasers are unipolar semiconductor lasers covering a wide range of the
infrared and terahertz spectrum. Lasing action is achieved by using optical intersubband …

In the last decade quantum cascade lasers (QCLs) have become the most widely used
source of mid-infrared radiation, finding large scale applications because of their wide …

Tunable diode laser absorption spectroscopy (TDLAS) has become a proven method of
rapid gas diagnostics. In the present review an overview of the state of the art of TDL-based …