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SUMMARY:Mitigating artifacts in Shack-Hartmann wavefront sensing for compl
 ex media [Astrophysics Seminar]
DTSTART:20260505T100000Z
DTEND:20260505T110000Z
DTSTAMP:20260513T004400Z
UID:indico-event-434@events.iiap.res.in
CONTACT:colloqm@iiap.res.in
DESCRIPTION:Speakers: Vyas Akondi (IISER Berhampur)\n\nAbstract: Shack-Ha
 rtmann wavefront sensing (SHWS) is foundational to adaptive optics\, yet i
 ts precision is often limited by artifactual aberrations when dealing with
  complex or non-ideal sources. This talk presents three advancements to ad
 dress these limitations. First\, I will discuss the challenge of wavefront
  sensing in the presence of sharp phase discontinuities (modeled via asymm
 etric bifocal optics)\, where traditional methods fail due to artifactual 
 coma. I will show how our proposed dual-plane integration method significa
 ntly reduces the error. Second\, I will describe the impact of volumetric 
 scattering and multiple reflecting layers—analogous to laser guide star 
 profiles or thick biological samples—which introduce centroid bias. We r
 ecently demonstrated a computationally efficient coordinate-transformation
  approach to model these effects. Finally\, to meet the real-time demands 
 of high-resolution adaptive optics\, we implemented hybrid machine learni
 ng strategies that achieve sub-millisecond reconstruction times. These tec
 hniques together offer a framework for improving SHWS accuracy and speed i
 n challenging conditions.\n\nhttps://events.iiap.res.in/event/434/
LOCATION:Auditorium
URL:https://events.iiap.res.in/event/434/
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