The paper presents first experiments with a refractive light sword optical element (LSOE). A refractive version of the LSOE was prepared in photoresist by gray scale photolithography. Then we examined chromatic aberrations of the produced element and compared them with those corresponding to two different lenses. For this purpose we performed two experiments, the first one where white light illumination was used and the latter one by the help of monochromatic illumination with three different wavelengths. The obtained results lead to the conclusion that the refractive LSOE does not exhibit significant chromatic aberrations and can be successfully used for imaging with extended depth of focus in polychromatic illumination.
This paper presents numerical analysis of imaging quality of a refractive light sword optical element (LSOE). For comparison other optical imaging elements with extended focal depth, such as the bifocal lens, the trifocal lens, the forward axicon and the backward axicon, were also checked. The parameters of all elements were assumed according to the human eye parameters in order to check possibilities of presbyopia compensation. Obtained results allow to state that the LSOE is a promising solution for compensation of insufficient human eye accommodation.
Several independent techniques have been explored for the measurement of optical constants of a single film on a glass substrate.One technique, inspired by Abeles, is based on comparing the reflectance of coated and uncoated sections of a substrate under "s" and "p" polarized light until a balance is found. This method is effective over a wide range of film thicknesses. Another technique is an envelope method based on an inhomogeneous model. To begin, an assumption is made of reflectance and transmittance on a spectrophotometer. The index is determined from measurements of the apparent refractive index. If the index and the thickness of the film are large enough to allow waveguide transmission, then the most direct means of measuring film index or thickness of the film is by determining the effective index "N." With a prism coupler, "N" can be found by measuring the coupling angle.
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