Showing papers by "Giovanni Pierattini published in 2002"
TL;DR: In this paper, a phase-shifting Mach-Zehnder interferometer is used for recording four-quadrature phase shifted off-axis holograms with a CCD camera.
93 citations
07 Nov 2002
TL;DR: Digital holography is proposed as a non-contact method for the inspection and characterization of MEMS and can be useful for assessing the fabrication process and the functionality as well as the reliability of micromachined structures.
Abstract: Digital holography is proposed as a non-contact method for the inspection and characterization of MEMS. The method can be useful for assessing the fabrication process and the functionality as well as the reliability of micromachined structures.
33 citations
TL;DR: In this article, a new interferometric technique for measuring the ordinary and extraordinary refractive indices of uniaxial crystals was proposed based on the measurement of the rotation-dependent phase changes of the optical path length in crystal plates.
21 citations
TL;DR: This work proposes a RGI with a different optical configuration that includes a lateral shearing in addition to folding and reversal operations that becomes sensitive to other terms of third-order aberrations such as defocusing, astigmatism, and spherical aberration.
Abstract: The reflecting grating interferometer (RGI) is a folded and reversal wave-front interferometer sensitive only to asymmetrical aberrations such as third-order coma. The RGI can isolate and evaluate coma both in nearly collimated and in noncollimated beams. We propose a RGI with a different optical configuration that includes a lateral shearing in addition to folding and reversal operations. With lateral shear, the RGI also becomes sensitive to other terms of third-order aberrations such as defocusing, astigmatism, and spherical aberration. Optical path difference equations for interpreting interferograms and numerical simulations are presented to show how the interferometer works in the shearing configuration. Its potential applications are described and discussed.
12 citations