Greg W. Forbes, Macquarie University, Sydney

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Greg W. Forbes, from Macquarie University, Sydney, Australia, will give a seminar “Modelling mid-spatial frequency surface structure in imaging systems" on Tuesday, September 25th, 2018, at 11:00 a.m. in Room Pierre Cotton, Institut Fresnel, Marseille.

Abstract :
Assessment of the degradation of the performance of an optical system caused by the mid-spatial frequency (MSF) structure on optical surfaces often relies on a perturbation method that dovetails with the familiar sequence of models based on geometrical and physical optics. In the case of imaging systems, the perturbative step yields estimates of wavefronts in the exit pupil which are, in turn, used to extract performance measures such as MTF, PSF, and Strehl ratio. To date, the validity of that perturbation appears to be poorly understood. In this talk I discuss this perturbation approach and present methods to estimate its errors and thereby arrive at a rule of thumb for its accuracy.

Biography :
Greg Forbes is an Adjunct Professor in Physics at Macquarie University and the Director of Scisense Consulting Pty Ltd. Following his PhD in Theoretical Physics at the Australian National University, he was a Fulbright Fellow at the Optical Sciences Center (Tucson), a tenured faculty member of The Institute of Optics (Rochester, 1985–1994), a Research Professor at Macquarie University (Sydney, 1994–2000), and a Senior Scientist at QED Technologies (2000– 2015). In 2012, he was awarded the David Richardson Medal and prize by the Optical Society of America for contributions to optical engineering. He has been an OSA Fellow since 1996.

Invitation : Miguel ALONSO, MOSAIC Group