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Proceedings Paper

Diode laser-diode laser-difference frequency spectrometer for the midinfrared spectral region
Author(s): Thomas Kelz; Martin Naegele; Bernd Sumpf; Heinz Detlef Kronfeldt
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Paper Abstract

In the mid-IR spectral region between 3 micrometers and 25 micrometers lead salt diode lasers are the most common light sources for high-resolution spectroscopy. Other light sources as CO-, CO2-lasers or sideband-lasers are expensive, non- portable and poorly tunable. To overcome the cryogenic cooling of the lead salt diode lasers and the describe disadvantages of the other light sources the generation of tunable laser radiation by difference frequency generation in nonlinear crystals as an alternative method is well known. Because of the low efficiency of the nonlinear process dye, solid state or gas lasers are the preferred pump sources for difference frequency generation up to now. To use the flexibility of the nonlinear process with the advantages of the visible- or near-IR-diode lasers we developed a portable tunable cw difference frequency spectrometer applying the nonlinear crystal AgGaS2 and two diode lasers as pump sources. High resolution scans over CO, N2O and OCS absorption lines near 2107 nm-1 demonstrate the capabilities of the spectrometer. Moreover, we present high resolution line broadening measurements of the R(2) line of 13C16O in the fundamental band as well as experiments for trace gas detection of 12C16O in the fundamental band.

Paper Details

Date Published: 22 May 1997
PDF: 8 pages
Proc. SPIE 3106, Spectroscopic Atmospheric Monitoring Techniques, (22 May 1997); doi: 10.1117/12.274708
Show Author Affiliations
Thomas Kelz, Technische Univ. Berlin (Germany)
Martin Naegele, Technische Univ. Berlin (Germany)
Bernd Sumpf, Technische Univ. Berlin (Germany)
Heinz Detlef Kronfeldt, Technische Univ. Berlin (Germany)


Published in SPIE Proceedings Vol. 3106:
Spectroscopic Atmospheric Monitoring Techniques
Klaus Schaefer, Editor(s)

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