Abstract
Common path type of interferometer, which is remarkably stable against the external noise such as a vibration, mechanical shock, temperature fluctuation and etc, can easily be constructed using a bifocal lens. The bifocal lens is usually fabricated using a very expensive uniaxial crystal and it is difficult to make larger size of lens. If we adopt a liquid crystal as an optically anisotropic material, it becomes easy to obtain the bifocal lens by using a lens shape substrate. In this work, a polymer layer with a spherical dip which is filled with nematic liquid crystal is sandwiched between two ITO substrates. A common path type interferometer using the liquid crystal lens is constructed and its basic properties are investigated by measuring an Al deposited thin film.
