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CATEGORIES:Hills Coffee Talks
SUMMARY:Blue Phase Liquid Crystals &amp\; Their Potential 
 for Astronomy - Oana Niculescu (University of Camb
 ridge)
DTSTART;TZID=Europe/London:20240514T111500
DTEND;TZID=Europe/London:20240514T120000
UID:TALK215869AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/215869
DESCRIPTION:Adaptive optics is a technique used to reduce the 
 effects of aberration on wavefront propagation\, u
 sed to correct for the light distortion which appe
 ars due to atmospheric turbulence. Customarily\, i
 n astronomy\, systems employed for this purpose us
 e deformable or adaptive mirrors as correctors\, w
 hich are costly and mechanically actuated.\n\nAs o
 pposed to a classic deformable mirror\, which requ
 ires actuators to change its shape\, a Liquid Crys
 tal Wavefront Corrector (LCWFC) uses its inherent 
 birefringence to act as a phase modulator and corr
 ect the incoming wavefront. Despite its reduced si
 ze and cost\, LCWFCs have historically suffered fr
 om a large response time\, which makes them less d
 esirable over typical solutions.\n\nBlue Phases wi
 ll be introduced as an alternative correcting medi
 um. They have the potential to overcome the usual 
 limitations of liquid crystal devices. Their worki
 ng principle and typical design considerations wil
 l be presented\, as well as progress made in makin
 g these devices a reality.
LOCATION:Coffee area\, Battcock Centre
CONTACT:Charles Walker
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