SEARCH · Search NASA
Results for “refractivity”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Refraction-Enhanced Backlit Imaging of Axially-Symmetric Inertial Confinement Fusion Plasmas
Abstract not provided
Complex angle isofrequency opening and reciprocity breaking in the refractive dual interface system
Explore the source record for details and available documents.
Simple solution to the Fresnel–Kirchoff diffraction integral for application to refraction-enhanced radiography
Abstract not provided
Method for transient modulation of refractive index under exposure to high power laser pulses
Abstract not provided
Emission pattern control and polarized light emission through patterned graded-refractiveindex coatings on GaInN light-emitting diodes
Explore the source record for details and available documents.
Submicron focusing of high-energy X-rays with silicon saw-tooth refractive lenses – fabrication and aberrations: errata
Three (3) items of errata are submitted for our recently published paper [ Opt. Express 28 , 36505 ( 2020 ) 10.1364/OE.405566 ]. One is a clarifying extension to the Fig. 3 caption. Two are typographical corrections. The scientific results and conclusions are unaffected.
Task-Specific Computational Refractive Element via Two-Photon Additive Manufacturing.
Abstract not provided.
High refractive index Fresnel lens on a fiber fabricated by nanoimprint lithography for immersion applications
Not Available
Earth Curvature and Atmospheric Refraction Effects on Radar Signal Propagation
The earth isn't flat, and radar beams don't travel straight. This becomes more noticeable as range increases, particularly at shallow depression/grazing angles. This report explores models for characterizing this behavior.
An Improved Refractive Focusing Optic
A diamond optic that can both dissipate the heat load while reducing phase profile errors of the beam will allow a more full realization of the benefits of the previous investments in light sources by allowing experiments that depend on high resolution imaging or spacial resolution. Reducing the x-ray spot size on samples will improve the quality of this information leading to better understanding of materials properties. During Phase I, we explored techniques for characterizing and improving the accuracy of the shape of diamond lenses, particularly in the apex of the parabolic curve, in order to make an optic whose optical performance exceeds what is currently available. We made efforts to reduce the lens surface roughness through a variety of dry etching methods. Additional work sought to make compound lenses with shorter focal lengths and to mount the lenses on copper supports by a variety of methods. Lastly, lenses were made and tested on the 1-BM beamline at APS.