Abstract

A novel method nicknamed ELASTIC is proposed for the alignment of multiple-aperture telescopes, in particular segmented telescopes. It only needs the acquisition of two diversity images of an unresolved source, and is based on the computation of a modified, frequency-shifted, cross-spectrum. It provides a polychromatic large-range tip/tilt estimation with the existing hardware and an inexpensive noniterative unsupervised algorithm. Its performance is studied and optimized by means of simulations. They show that with 5000 photoelectrons/subaperture/frame and 1024×1024 pixel images, residues are within the capture range of interferometric phasing algorithms such as phase diversity. The closed-loop alignment of a 6-subaperture mirror provides an experimental demonstration of the effectiveness of the method.

© 2017 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Extended capture range for focus-diverse phase retrieval in segmented aperture systems using geometrical optics

Alden S. Jurling and James R. Fienup
J. Opt. Soc. Am. A 31(3) 661-666 (2014)

Unambiguous phase retrieval as a cophasing sensor for phased array telescopes

Fabien Baron, Isabelle Mocoeur, Frédéric Cassaing, and Laurent M. Mugnier
J. Opt. Soc. Am. A 25(5) 1000-1015 (2008)

Sub-aperture piston phase diversity for segmented and multi-aperture systems

Matthew R. Bolcar and James R. Fienup
Appl. Opt. 48(1) A5-A12 (2009)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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

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 OSA member, or as an authorized user of your institution.

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

Figures (16)

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

Contact your librarian or system administrator
or
Login to access OSA 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 OSA member, or as an authorized user of your institution.

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

Equations (38)

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

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