<title>Detection of nitrogen oxides by high-resolution near-infrared absorption spectroscopy</title>

Abstract

Near-infrared absorption spectra of NO, N02, and N20 were observed in the wavelength region between 1.2 and 1.9 ii m using a high-resolution Fourier-transform spectrometer, and we have obtained precise absorption data which are useful for Tunable Diode Laser Absorption Spectroscopy (TDLAS).Furthermore, the NO and N2O were detected by means of TDLAS method for the first time using InGaAs-DFB diode lasers which were designed to access absorption lines at wavelengths of 1.798 and 1.766 /2 m, respectively.

Frequency comb investigation of monolithic mode‐locked GaSb‐based laser at 1.7 µm by heterodyne detection

“…In the past, the main research focus of monolithic mode‐locked lasers was based on wavelengths from 0.63 to 1.6 µm on the GaAs and InP material system [4 ]. However, the spectral region from 1.6 to 2.0 µm is interesting for high‐resolution gas sensing of greenhouse gases like nitric oxide, methane and nitrous oxide [5, 6 ], as well as for liquid phase biomolecules such as glucose, lactate, albumin, urea and ammonia [7 ]. The frequency comb of monolithic mode‐locked lasers also enables high precision and high speed metrology by optical heterodyne‐detection [8, 9 ].…”