Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Experimental verification of dispersed fringe sensing as a segment phasing technique using the Keck telescope

Not Accessible

Your library or personal account may give you access

Abstract

Dispersed fringe sensing (DFS) is an efficient and robust method for coarse phasing of segmented primary mirrors (from one quarter of a wavelength to as much as the depth of focus of a single segment, typically several tens of microns). Unlike phasing techniques currently used for ground-based segmented telescopes, DFS does not require the use of edge sensors in order to sense changes in the relative heights of adjacent segments; this makes it particularly well suited for phasing of space-borne segmented telescopes, such as the James Webb Space Telescope. We validate DFS by using it to measure the piston errors of the segments of one of the Keck telescopes. The results agree with those of the Shack-Hartmann-based phasing scheme currently in use at Keck to within 2% over a range of initial piston errors of ±16 μm.

© 2004 Optical Society of America

Full Article  |  PDF Article
More Like This
Phasing the mirror segments of the Keck telescopes: the broadband phasing algorithm

Gary Chanan, Mitchell Troy, Frank Dekens, Scott Michaels, Jerry Nelson, Terry Mast, and David Kirkman
Appl. Opt. 37(1) 140-155 (1998)

Phasing the mirror segments of the Keck telescopes II: the narrow-band phasing algorithm

Gary Chanan, Catherine Ohara, and Mitchell Troy
Appl. Opt. 39(25) 4706-4714 (2000)

Phasing segmented mirrors: a modification of the Keck narrow-band technique and its application to extremely large telescopes

Achim Schumacher, Nicholas Devaney, and Luzma Montoya
Appl. Opt. 41(7) 1297-1307 (2002)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (15)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved