The optical responses of two sides of float glass in the soft-x-ray region were studied at the Indus-1 synchrotron facility. To the best of our knowledge these are the first experimentally obtained optical data for both sides of float glass in the soft-x-ray region. Optical constants δ and β were determined by use of angle-dependent reflectance techniques in the wavelength range 80–200 Å. On the side of the glass that was tin indiffused, a significant difference in δ value from that of the non-tin-side surface was observed. The measured data were compared with Henke’s tabulated value of SiO2. The surface roughness of float glass was separately determined by hard-x-ray reflectivity to minimize the number of fitting variables. The effect of a contamination layer on the determination of optical constants was avoided by an appropriate sample-cleaning method.
© 2003 Optical Society of America
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(230.4170) Optical devices : Multilayers
(240.6700) Optics at surfaces : Surfaces
(340.7470) X-ray optics : X-ray mirrors
Mohammed H. Modi, Gyanendra S. Lodha, Kawal Jeet S. Sawhney, and Rajendra V. Nandedkar, "Effect of Tin Diffusion on the Optical Behavior of Float Glass in the Soft-X-Ray Region," Appl. Opt. 42, 6939-6944 (2003)