Physics – Optics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992lgsa.work...10a&link_type=abstract
Presented at the Laser Guide Star Adaptive Optics Workshop, Albuquerque, NM, 10-12 Mar. 1992
Physics
Optics
Beam Waveguides, Image Intensifiers, Laser Beams, Light Beams, Mirrors, Physical Optics, Wave Fronts, Astronomy, Cameras, Focusing, Lenses, Photocathodes, Telescopes
Scientific paper
A two-stage intensified 192 x 239 pixel imager developed by Eastman Kodak for motion analysis was used to construct a 1 kHz frame-rate Hartmann wavefront sensor. The sensor uses a monolithic array of lenslets with a focal length that is adjusted by an index fluid between the convex surface and an optical flat. The accuracy of the calculated centroid position, which is related to wavefront measurement accuracy, was obtained as a function of spot power and spot size. The sensor was then dynamically tested at a 1 kHz frame-rate with a 9 x 9 lenslet array and a fast steering mirror, which swept a plane wavefront across the wavefront sensor. An 8 cm diameter subaperture will provide a return signal (589 nm) level of about 1000 photons/ms using the AVLIS 1 kW laser (stretched pulse) as guide star source, which is sufficient to yield a wavefront measurement of better than gamma/10 rms. If an area of 6 x 6 pixels per Hartmann spot were allocated, this wavefront sensor could support a 32 x 32, or 1024, element deformable mirror.
Avicola Kenneth
Balch K. S.
Brase J.
Presta R.
Salmon Thaddeus J.
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