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Durham University

Department of Physics

Internal events

Wednesday 20 March 2019

CfAI Seminar Programme

1:00pm to 2:00pm, OCW017 (Ogden West L0 seminar room)

Mark Corrigan: Low order wavefront sensing with photonic lanterns

Nicolas Dubost: Closing a control loop with a point-diffraction interferometer

Summary: In high-contrast adaptive optics, point-diffraction interferometers (PDI) have been proposed to accurately measuring quasi-static aberrations, cophasing segmented mirrors, dealing with the island problem and even acting as main WFSs in XAO systems. Here we report on the results of the integration of our own PDI, CAWS, into CHOUGH, the Durham high-order adaptive optics system. Closed-loop experiments with static aberrations were performed with both monochromatic and polychromatic light. With monochromatic light, PSF measurements showed Strehl ratio increases from 0.20 to 0.66. Preliminary broadband light tests with a FWHM of ∆λ=12% (80 nm) also showed a reduction of residual errors and an improvement of Strehl, which proves the polychromatic capabilities of CAWS. Initial simulation results are also presented, to study the necessary conditions to close a control loop on-sky.

Contact Mrs Claire Whitehill (claire.whitehill@durham.ac.uk) for more information about this event.


Wednesday 3 April 2019

CfAI Seminar Programme

1:00pm to 2:00pm, OCW017 (Ogden West L0 seminar room)

Contact Mrs Claire Whitehill (claire.whitehill@durham.ac.uk) for more information about this event.


Wednesday 17 April 2019

CfAI Seminar Programme

1:00pm to 2:00pm, OCW017 (Ogden West L0 seminar room)

Contact Mrs Claire Whitehill (claire.whitehill@durham.ac.uk) for more information about this event.


Thursday 6 June 2019

Research Staff Consultative Committee

2:00pm to 5:00pm, OC218 (Ogden Conference Room)

Contact Dr Matthew Townson (matthew.townson@durham.ac.uk) for more information about this event.


Wednesday 21 August 2019

CfAI Seminar Programme

1:00pm to 2:00pm, OCW017 (Ogden West L0 Seminar Room)

Contact Mrs Claire Whitehill (claire.whitehill@durham.ac.uk) for more information about this event.