&lt;title&gt;Computer modeling of slit diffraction (spatial filtering)&lt;/title&gt;

Satter, Michael J.

doi:10.1117/12.140694

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Examples ofthe use of this technique to model multiple stages of diffracting apertures, including spatial filtering, are in a Fourier transform lens system {5], in a spectrometer system [6], and a Lyot stop system for diffraction defence [7].…”

Section: The Asap Programmentioning

confidence: 99%

<title>Computer-aided modeling of beam propagation effects in diffraction-critical spaceborne instruments</title>

1996

View full text Add to dashboard Cite

This talk concerns applications of a ray-trace model to the computation of the effect of diffraction on beam propagation. It reports the use of the technique in the design of apertures for space-borne instruments having critical diffraction properties.The modelling technique used is that of gaussian beam decomposition a numerical beam propagation technique incorporated in a commercially available ray-trace program. The result is the powerful capability to model the optical field at any point, in systems of any geometry, with any amount of aberration.The technique is particularly useful for design problems where 'non-imaging' effects are important, and examples of its use will be given. Although the computation requirements for such detailed analysis may seem daunting, the continuing increase in readily available computing power is now overcoming this drawback.The application here is to certain 'diffraction-critical' situations, where the design of correctly sized apertures is needed for the control of unwanted diffraction effects. Three recent design studies are illustrated:1 . Millimetre wave imaging with off-axis reflectors. Analysis of the effects of aberration on coherent detection efficiency. 2. Long-distance beam propagation in space-borne laser interferometry. This involves the analysis of coherent detection efficiency in the presence of aberrated gaussian beams. 3. Design of a Lyot stop system for an infra-red radiometer which is to view the Earth's limb from space. Here the critical (and unwanted) diffraction is that from the bright Earth disc, lying just outside of the instrument field of view.The analysis technique is explained, and examples given of diffracted energy patterns analysed at progressive stages in the system. It is shown how these aid the design and analysis of the systems. The aim is to show the range problems in which this method is useful, and to hopefully learn from others at the conference about other cases where such techniques have been used or else might be useful.

show abstract

Section: The Asap Programmentioning

confidence: 99%