Direct measurement of dispersion of the group refractive indices of quartz crystal by white-light spectral interferometry |
| |
Authors: | Petr Hlubina Dalibor Ciprian Lenka Knyblová |
| |
Institution: | Department of Physics, Technical University Ostrava, 17. listopadu 15, 708 33 Ostrava-Poruba, Czech Republic |
| |
Abstract: | We present a white-light spectral interferometric technique employing a low-resolution spectrometer for a direct measurement of the dispersion of the ordinary and extraordinary group refractive indices of a quartz crystal over the wavelength range approximately from 480 to 860 nm. The technique utilizes a dispersive Michelson interferometer with the quartz crystal of known thickness to record a series of spectral interferograms and to measure the equalization wavelength as a function of the displacement of the interferometer mirror from the reference position, which corresponds to a balanced non-dispersive Michelson interferometer. We confirm that the measured group dispersion agrees well with that described by the dispersion equation proposed by Ghosh. We also show that the measured mirror displacement depends, in accordance with the theory, linearly on the theoretical group refractive index and that the slope of the corresponding straight line gives precisely the thickness of the quartz crystal. |
| |
Keywords: | 42 25 Hz 42 25 Lc 42 81 Gs 78 20 Fm |
本文献已被 ScienceDirect 等数据库收录! |