نتایج جستجو برای: refractive surfaces
تعداد نتایج: 150251 فیلتر نتایج به سال:
This thesis deals with a new automated tridimensional inspection system for transparent surfaces, based on polarization analysis. We first present an extension of the „Shape from Polarization‟ method for transparent surfaces. After being reflected, an unpolarized light wave becomes partially linearly polarized, depending on the surface normal and on the refractive index of the media it impinges...
The use of surface plasmons on planar surfaces for the characterisation of those surfaces is analysed. In particular, analytic expressions are derived for the sensitivity of such characterisation to the variation of bulk refractive indices, and to the addition of thin dielectric layers on the plasmon supporting surface. Comparison between surface plasmon and dielectric waveguide techniques is m...
Three-dimensional (3D) direct laser writing is a powerful technology to create nano- and microscopic optical devices. While the design freedom of this offers possibility reduce different monochromatic aberrations, reducing chromatic aberrations often neglected. In Letter, we successfully demonstrate combination refractive diffractive surfaces refractive/diffractive achromat show, best our knowl...
Background and purpose: Astigmatism is a common optical dysfunction, effective on various visual outcomes and one of the important criteria of refractive surgery. The aim of present study was to evaluate the correlation between refractive, corneal and residual astigmatism in refractive surgery candidates. Materials and methods: In this cross-sectional descriptive, analytical study, 200 patient...
there are several techniques in use for non-linear refractive index measurement, namely, interferometric techniques, in which conventional inter-ferometers are used, degenerate for wave mixing (dfwm), and z-scan, each of these techniques suffers from some shortcmings. for example conventional interferometers like fabry-perot and twyman-green need high quality optical components, unwanted reflec...
Whistler mode waves in the magnetosphere play an important role in the energy dynamics of the Earth’s radiation belts. Previous theoretical work has been extended to include ions in the fully adiabatic warm plasma theory. Using a finite electron and ion temperature of 1 eV, refractive index surfaces are calculated for 1–10 kHz whistler mode waves in the inner magnetosphere (L≲ 2.5). For the fre...
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