Spectroscopy with infrared lasers

Hinkl, E. D., K. W. Nill, and F. A. Blum. Infrared spectroscopy with tunable lasers, pp. 125-1%. In H. Walther, Ed. Laser Spectroscopy of Atoms and Molecules. New York Springer-Verlag, 1976. 

This section can give only a brief survey of those tunable devices that have proved to be of particular importance for spectroscopic applications. For a more detailed discussion of the different techniques, the reader is referred to the literature cited in the corresponding subsections. A review of tunable lasers that covers the development up to 1974 has been given in [5.108], while more recent compilations can be found in [5.92,5.109]. For a survey on infrared spectroscopy with tunable lasers see [5.110-5.112]. 

R.S. McDowell High resolution infrared spectroscopy with tunable lasers . In Advances in Infrared and Raman Spectroscopy, Vol 5, ed. by R.J.H. Clark, R.E. Hester (Heyden, London 1978)... 

E.D. Hinkley, K.W. Nill, F.A. Blum Infrared spectroscopy with tunable lasers . In Laser Spectroscopy of Atoms and Molecules, ed. by H. Walther, Topics Appl. Phys. Vol. 2 (Springer, Berlin, Heidelberg 1976)... 

In combination with infrared lasers, in particular tunable quantum cascade lasers (QCLs), very fast redox switching combined with IR monitoring appears possible. This opens the possibility to use direct electrochemistry for the triggering of fast chemical and biochemical reactions, and the fingerprint selectivity of infrared spectroscopy for the analysis of the reaction details. 

The choice of excitation laser is essential for DUV resonance Raman spectroscopy. With a wavelength-changeable UV laser, molecularly selective resonance Raman microscopy could be realized. The second harmonics of an argon ion laser offers several emission lines in the DUV range (257, 244, 238, 229 nm) that are suitable for wavelength-selective resonance Raman spectroscopy. Solid-state DUV lasers are also available based on harmonic generation with infrared lasers, typically... 

Infrared diode laser spectroscopy has been used for the measurement of hydrocarbon and CO concentrations in exhaust (13, 14, 15). The adsorption path length, and thus the absorption cell volume, required for hydrocarbon measurement is rather large, limiting the time-resolution of the measurement. The absorption path length required for CO measurement, however, is relatively short and approximately equal to the diameter of a standard exhaust pipe. This allows CO to be measured with high time-resolution by an infrared laser beam passed through an... 

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