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!