Improved optical interference technique for the measurements of refractive index and thickness of submicron bubble films

A method of measuring the refractive index and thickness of garnet films by the combined use of the variable wavelength method and the variable angle monochromatic fringe observation method has been developed. This technique can be used to determine film thicknesses from 0.5 μm to several microns with an accuracy of 1%. A rapid and accurate evaluation technique for the measurement of the bubble collapse field is described. Stable submicron bubbles can be found in the Systems, (YCaSm)3- (GeFe)5O12, (YCaEuTm)3(GeFe)5O12and (YLaTm)3(GaFe)5O12. Bubble velocities for these films were measured by the bubble transport method. At a driving field of 2.5 Oe across the bubble, velocities ranging from 300 te 1050 Cm/sec have been observed.