A study of optical absorption edges in copper-calcium phosphate glasses containing iodine
A series of glass specimens was prepared from mixtures of CuO, CaO, P2O5 and CuI and their optical absorption coefficients were measured as functions of photon energy in the range 3.0 to 4.5 eV. From the results the values of the optical energy gap are calculated and found to depend quite sensitively on the added iodine.
First measurements of visibility and phase of two-beam interference fringes are presented for a large number of different states of polarization of light entering an interferometer. The measurements were made with a cube-corner interferometer. Results confirm the theory of complex visibility. It is demonstrated, that exact computer calculations are possible and informative. A comparison of observed and calculated values is represented in the s-diagram and some important relations and conclusions are discussed.