For refractive index measurements of solid thin films when film absorption is negligible, the Brewster angle method described by Abeles [ Compt. rend. 228, 553 ( 1949)] is extremely convenient. An apparatus is described which facilitates routine index measurements using this method. A corner mirror system elimates the need for manually tracking the reflected beam as the angle of incidence is varied. Settings are reproducible to within about 0.1% of the index value under optimun conditions, the results agreeing with those of other observers.
A method is described whereby the apparatus may be used for the routine measurement of the indexes of nonabsorbing liquid films.
© 1957 Optical Society of AmericaFull Article | PDF Article
OSA Recommended Articles
J. Opt. Soc. Am. 54(2) 198-203 (1964)
Qi Hong Wu and Ian Hodgkinson
J. Opt. Soc. Am. A 10(9) 2072-2075 (1993)
R. M. A. Azzam and T. F. Thonn
Appl. Opt. 22(24) 4155-4165 (1983)