Abstract

The optical constants of crystals of bismuth tellurium sulfide have been determined from reflectance measurements. Because it is a uniaxial crystal, two sets of optical constants are associated with it. One of these sets, denoted by (nc, kc), corresponding to the component of an E vector parallel to the symmetry axis (c axis) has been determined in the wavelength range 1–16.5 μm. The other set, denoted by (na, ka), corresponding to the perpendicular component of an E vector, has been obtained in the range 0.2–16.5 μm. Two methods of analysis, the classical oscillator method and the Kramers–Kronig method, are used to obtain the (na, ka) set, but the (nc, kc) set is obtained by using the classical oscillator method alone. A brief discussion on the uniqueness of the constants as obtained by a single method of analysis is presented.

© 1982 Optical Society of America

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