SEDL / STP / STP911-EB / STP28965S

Bulk Absorption Measurements Using Prism-Shaped Samples for Laser Calorimetry

Temple, PA
Michelson Laboratory, Physics Division Naval Weapons Center, China Lake, California

Arndt, DP
Michelson Laboratory, Physics Division Naval Weapons Center, China Lake, California

Pages: 5    Published: Jan 1985

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Abstract

A method is described where low absorption samples are cut in the shape of prisms. The prism angles are chosen to allow the (polarized) laser beam to enter the prism at normal incidence and exit the prism at Brewster's angle. This configuration eliminates internal reflections and allows for easier analysis. Measurements are then made at various positions along the prism to obtain the total absorptance for several path lengths through the sample. The method has the advantage of simplified analysis and minimal surface absorption fluctuation. The disadvantages are special sample shape and a need for a special calorimetric setup allowing sample translation. Representative data will be shown for single-crystal and fusion-cast CaF² at HF and DF wavelengths.