We have extended the Tiny Tim HST point-spread function simulator so that it can now generate PSFs for the Wide Field Camera 3. This ISR describes the changes and sources of information used and shows some comparisons between modeled PSFs and those observed with the CASTLE stimulus during thermal vacuum testing. A web interface to the same simulation software is also available. Introduction Tin...

Chromatic aberrations are an important design consideration in high resolution, high bandwidth, refractive imaging systems that use visible light. Here, we present a fiberbased spectral/Fourier domain, visible light OCT ophthalmoscope corrected for the average longitudinal chromatic aberration (LCA) of the human eye. Analysis of complex speckles from in vivo retinal images showed that achromati...

All imaging techniques require the use of optical components to transfer light from a source to a sensor. The impact of the transfer optics on the image resolution is often not well understood. To improve this situation, the point spread function (PSF) of the optical system needs to be measured; this requires a good point source and sufficient dynamic range to fully characterize the PSF distrib...

This report describes the rationale for recommending focus as the primary selection criterion in choosing the final IR replacement grisms. Introduction Instrument-level imaging during the first thermal vacuum ground test of the WFC3 IR channel in the fall of 2004 revealed that while the IR filters performed as expected, well within specification, the grisms produced significantly out-of-focus, ...

Booklet IAU SYMPOSIUM 305 Polarimetry: From the Sun to Stars and Stellar Environments Punta Leona, Costa Rica 30 November – 5 December 2014 Abdel Hady, Ahmed The high energetic particles released during the decline phases of solar cycle 24 Poster B1 During the decline phases of the last five solar cycles, new peak has appeared releasing high energetic particles. During October 2003 (so-called H...