Abstract
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.
Highlights
The increased depth of focus can be a valuable advantage of incoherent imaging systems in many applications
According to the previous publications the diffractive light sword optical element (LSOE) can be successfully applied for imaging with extended depth of focus [25, 27, 28]
The main aim of this work was to examine the chromatic aberrations of the refractive LSOE
Summary
The increased depth of focus can be a valuable advantage of incoherent imaging systems in many applications. A focus stretched in the form of a line segment hereby makes possible to connect a certain range of input object planes with a certain range of output image planes according to the lens equation The elements of this kind can be designed in different ways including geometrical approach [10,11,12,13,14,15], the ray tracing method completed by the energy conservation principle [16,17,18,19], iterative methods [20,21,22] or stochastic methods [23, 24]. The last Section discusses the results of the experiments of the refractive LSOE
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