Spectroscopy high-contrast transmission

A particularly simple form of saturation spectroscopy is obtained if a sample that is sufficiently dense to completely block a probe beam is used. Only at the line centre does the bleached path induced by a strong counter-propagating pump beam allow the probe beam to emerge from the cell and hit the detector. A simple set-up and a schematic curve are shown in Fig. 9.43 for this type of high-contrast transmission spectroscopy [9.161]. 

S. Svanberg, G.-Y. Yan, T.P. Duffey, A.L. Schawlow High-contrast Doppler-free transmission spectroscopy. Opt. Lett. 11, 138 (1986)... 

Transmission electron spectroscopy (TEM) studies of the co-deposited thin films revealed a continuos polymer phase with a largely inter-dispersed SiOj regions on a 5-50 nm scale, confirming the nanocomposite morphology. As mentioned in section 3.1.3, parylene thin films obtained are typically highly crystalline. In contrast, SiO is an amorphous material. From X-ray diffraction analyses, it was observed that by increasing the relative amount of polymer in the nanocomposite, the crystallinity was... 

Infrared emission spectroscopy is a useful and effective technique for studying the surface of liquid and solid organic, inorganic, and polymeric materials, and for the in. situ process-monitoring of high-temperature reactions and thermal transformations [81], [82]. In contrast to the conventional transmission technique, in emission spectroscopy the sample itself is the infrared source. The temperature of the sample is raised, which increases the Boltzmann population of the... 

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