Aberration measuring in the random phase field by the Talbot wavefront sensor

Abstract

The accuracy of measuring optical aberrations in the random phase field by the Talbot wavefront sensor is theoretically investigated. The possibilities of a grating self-imaging phenomenon in the random phase field are investigated based on the simulation results. Random fields of two different types are considered: amplitude and phase Gaussian fields. Simulation results show that the cosine grating is more stable for phase noise in comparison with gratings that have Gaussian and square binary profiles on each cell unit. It is found that phase noise gives increments of high-order aberrations for wavefront reconstruction.

Aberration measurements by a Talbot wavefront sensor in the presence of intensity variations

“…In contrast to the phase noise, where second order aberrations (defocus and astigmatism) are more stable to phase deviations in comparison to the third order [8], present simulations show that intensity variations affect values of the same order.…”

“…even in the presence of high level of amplitude noise. Besides, images do not contain any visible pit displacements as it is seen in the case of phase inhomogeneties [8,24]. On the other hand, pit images contain non constant intensity distributions and this leads to local displacements based on the Eq.…”

“…It should be noted, that the restoration procedure for Talbot sensor is identical to Shack-Hartman one [23]. However, during optical wave propagation in the measuring channel random amplitude variations arises that lead to the local image distortions and can affect on the measuring errors of optical wavefront reconstruction [8]. Therefore, the purpose of the paper is to describe the effect of intensity variations on the wavefront measurement errors in the setup with Talbot wavefront sensor.…”

Observation of Plasmonics Talbot effect in graphene nanostructures

“…This is essential for assessing the performance and optimization of plasmonic devices in various applications 46 – 57 . In this realm recently several invaluable practical were proposed 58 – 64 .…”