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Active Optics and Wavefront Sensing at the Upgraded 6.5-meter MMT Xiaoyin Zhu Dec 12, 2012 OPTI 521...
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Transcript of Active Optics and Wavefront Sensing at the Upgraded 6.5-meter MMT Xiaoyin Zhu Dec 12, 2012 OPTI 521...
Active Optics and Wavefront Sensing at the Upgraded 6.5-meter MMT
Xiaoyin Zhu
Dec 12, 2012
OPTI 521 Paper Synopsis
By T.E. Pickering, etc.
Contents
Background-MMT
Wavefront sensing system
Current work
Background
http://www.mmto.org/
MMT
Multiple Mirror Telescope
6.5-meter diameter
Operated by
MMT Observatory (MMTO)
Location: Mt. Hopkins
60 kilometers (37 miles)
south of Tucson, AZ
Background
The Original MMT (1979-1998) New MMT Telescope (2000- Date)
Background
Classical Cassegrain optical design
F/5
MMT F/9
F/15
Background
F/9 wavefront sensor
F/9 wavefront sensor
F/9 wavefront sensor
Representative reference (left) and data (right) images taken with the f/9 Shack-Hartmann wavefront sensor
F/5 wavefront sensor
F/5 wavefront sensor
F/5 Focus
Lenslet ArrayFL= 40 mm
CollimatorFL= 40 mm
CCD Negative field lens
A negative field lens is added to image the system pupil on the lenslet array
F/5 wavefront sensor
Representative reference (left) and data (right) images taken with the f/5 wavefront sensor
WAVEFRONT ANALYSIS AND SOFTWARE
Results and performance
Before correction
After correction
Upgrade the F/9 Wavefront sensor
Current system has some
cutoff at the edges
Ideal image fits the lenslet array
Upgrade the F/9 Wavefront sensor
Upgrade the F/9 Wavefront sensor
Thank you!