Diode laser-diode laser-difference frequency spectrometer for the midinfrared spectral region

Thomas Kelz; Martin Naegele; Bernd Sumpf; Heinz Detlef Kronfeldt

doi:10.1117/12.274708

22 May 1997 Diode laser-diode laser-difference frequency spectrometer for the midinfrared spectral region

Thomas Kelz, Martin Naegele, Bernd Sumpf, Heinz Detlef Kronfeldt

Proceedings Volume 3106, Spectroscopic Atmospheric Monitoring Techniques; (1997) https://doi.org/10.1117/12.274708
Event: Environmental Sensing III, 1997, Munich, Germany

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.

Citation Download Citation

Thomas Kelz, Martin Naegele, Bernd Sumpf, and Heinz Detlef Kronfeldt "Diode laser-diode laser-difference frequency spectrometer for the midinfrared spectral region", Proc. SPIE 3106, Spectroscopic Atmospheric Monitoring Techniques, (22 May 1997); https://doi.org/10.1117/12.274708

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KEYWORDS

Semiconductor lasers

Spectroscopy

Carbon monoxide

Absorption

Lead

Gas lasers

Light sources

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