1. C. S. Chen, J. P. Szczesniak, and J. C. Corelli, J. Appl. Phys. 46, 303 (1975).JAPIAU0021-8979
2. A. J. Michael, J. Opt. Soc. Am. 58, 889 (1968).JOSAAH0030-3941
3. B. A. Bendow and P. S. Gianino, Air Force Cambridge Research Laboratories Report No. AFCRL‐TR‐74‐0533, 1974 (unpublished). This report contains references to earlier papers and reports on the theoretical aspects of the problem.
4. C. A. Pitha and J. Friedman, Proceedings of the Fourth Annual Conference on Laser Window Materials, Tuscon, 1974, edited by C. R. Andrews and C. L. Strecker (Air Force Materials Laboratory, Wright Patterson Air Force Base, Ohio, 1975), p. 149.
5. A. Feldman, I. H. Malitson, D. Horowitz, R. M. Waxler, and M. J. Dodge, in Ref. 4, p. 117.