Abstract
A Mach-Zehnder interferometer illuminated by a CO2 laser at wavelengths selectable between 9.1 μ and 11.3 μ is described. With a field of view 22 mm in diameter two-dimensional interferograms are recorded. The method uses liquid crystals for ir-optical image conversion. With the small laser used, an exposure time of sec is required, while the steady state resolution limit of the detector is a radiation flux of less than 5 mW/cm2. The interference pattern of an argon plasma jet is shown.
© 1970 Optical Society of America
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