Far-Infrared Transmission of Commercially Available Crystals and High-Density Polyethylene

We would like to thank Harshaw Chemical Co., Cleveland, Ohio, for providing us with the polished crystals.

For a complete bibliography of transmission of crystals, see Palik E. D. , “A Far Infrared Bibliography,” Natl. Res. Lab. Bibliog. No. 21, U. S. Dept. Commerce, Office of Tech. Serv.

Hadni A. Claudel J. Gerbaux X. Morlot G. , and Munier J. , Appl. Opt. 4, 487–494 (1965).