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Single frequency InAsSb lasers operating from 77 to 110 K in CW mode have been tested for their suitability for trace gas analysis. The threshold current I th was as low as 25 mA at 78 K with a characteristic temperature T 0 of 25 K. Selected lasers show single-frequency operation over a large...
A review of recent works made in the Diode Laser Spectroscopy Group of the Institute of Spectroscopy in Troitsk, Russia, is presented. The qualitative modifications of the rovibrational energy level structure under rotational excitation (so called critical phenomena) were studied for the v 1 , v...
The wavenumber λ d of a tunable diode laser (TDL) is actively forced to preserve its interference order k d through a Michelson interferometer with a path difference D ( D = k d × λ d ). This path difference and its variation ΔD are controlled by a stabilised He Ne laser. A change ΔD induces...
In performing laser spectroscopy on objects with a spectrum showing a rich structure, it will be worthwhile to fully use the possibilities of the resolving power inherent to the linewidth of the laser radiation. Tuning rates should be limited to a range in which transform-limited bandwidth is...
Digital signal processing algorithms were applied to diode laser frequency modulation spectrometers in the near- and mid-infrared spectral ranges. These algorithms include digital bandpass filters, a Wiener filter, a matched filter, and a Kalman filter. Digital signal processing is easy to...
Using a tunable diode-laser spectrometer, N 2 - and O 2 -broadening coefficients have been measured in the Q P and Q R branches of the v 3 band of 12 CH 3 D. The collisional widths have been obtained by fitting Voigt and Rautian profiles to the measured shapes of the lines. Semi-classical...
Infrared absolute line intensities of the v 3 band of 12 CH 3 F have been measured around 9.5 μm using a diode-laser spectrometer. We have deduced the vibrational band-strength to be S 0 v = 377.9 ± 5.9 cm −2 atm −1 at 296 K and the first Herman-Wallis factor.
Molecules with more than four atoms generally exhibit relatively complex vibration-rotation spectra at standard conditions. Therefore the assignment of individual spectral lines is often impossible. Furthermore, these molecules are difficult to detect in trace concentrations by absorption...
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