Sensors are perhaps the most important and integral components of our modern society.
With global warming and environmental pollution garnering ever-increasing attention, as …

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 present a practical implementation of calibration-free wavelength-modulation
spectroscopy with second harmonic detection (WMS-2f) for measurements of gas …

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 …

Laser diagnostic techniques play a large and growing role in combustion research and
development. Here we highlight three areas where quantitative sensing based on laser …

A variety of frequency-modulation methods for high-sensitivity absorption detection of gas-
phase species has evolved in recent years. The distinctions among these methods are …

The development and initial demonstration of a scanned-wavelength, first-harmonic-
normalized, wavelength-modulation spectroscopy with nf detection (scanned-WMS-nf/1f) …

Tunable diode laser absorption measurements at high pressures by use of wavelength-
modulation spectroscopy (WMS) require large modulation depths for optimum detection of …

A theoretical model of wavelength modulation spectroscopy that uses a laser diode on a
Lorentzian absorption line is presented. This theory describes the general case of a current …

Recent advancements in ultra-low-loss silicon nitride (S i _3 N _4)-based photonic
integrated circuits have surpassed fiber lasers in coherence and frequency agility. However …