Diffraction-Limited Imaging With The Coherently Cophased Mmt

E. Keith Hege; Donald W. McCarthy; J. C. Hebden

doi:10.1117/12.942074

Diffraction-Limited Imaging With The Coherently Cophased Mmt

E. Keith Hege, Donald W. McCarthy, J. C. Hebden

Steward Observatory

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The 6.86 m Multiple Mirror Telescope (MMT) has been operated as a coherently cophased interferometric imaging array since 1983. PSF observations at wavelengths from 410 to 850 nm reveal characteristics which must be controlled to achieve reliable imaging at resolutions less than 75 nanoradians (0.015 arc seconds). The MMT has been used to acquire differential speckle images of Alpha Orionis in the H-alpha line and a nearby “continuum” bandpass at 656.9 nm. Broadband images of a 12th magnitude geosynchronous communications satellite, from which shape and size measures have been obtained with 100 nm resolution, give evidence of the capability of the MMT in speckle imaging applications. We have recently extended the cophasing capability to infrared wavelengths by providing reflective pathlength compensation capability.

Original language	English (US)
Pages (from-to)	20-26
Number of pages	7
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	828
DOIs	https://doi.org/10.1117/12.942074
State	Published - Jan 29 1988

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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@article{3c4c4b5962434a61a2e01ea0a4df4570,

title = "Diffraction-Limited Imaging With The Coherently Cophased Mmt",

abstract = "The 6.86 m Multiple Mirror Telescope (MMT) has been operated as a coherently cophased interferometric imaging array since 1983. PSF observations at wavelengths from 410 to 850 nm reveal characteristics which must be controlled to achieve reliable imaging at resolutions less than 75 nanoradians (0.015 arc seconds). The MMT has been used to acquire differential speckle images of Alpha Orionis in the H-alpha line and a nearby “continuum” bandpass at 656.9 nm. Broadband images of a 12th magnitude geosynchronous communications satellite, from which shape and size measures have been obtained with 100 nm resolution, give evidence of the capability of the MMT in speckle imaging applications. We have recently extended the cophasing capability to infrared wavelengths by providing reflective pathlength compensation capability.",

author = "Hege, {E. Keith} and McCarthy, {Donald W.} and Hebden, {J. C.}",

note = "Funding Information: This work was supported in part by NSF grant AST-8519506. We are particularly greatful to Dan Blanco for the design of the new articulated beam combiner and to John Montgomery for the computer codes which provide the necessary coordinated secondary/beam combiner control for maintaining cophasing and coalignment simultaneously. We also appreciate the competent, willing, courteous support of the MMTO technical group in the continuing development and operation of the telescope. Ron Watkins and Shaun Cox provided assistance with the digitization and reductions of the video specklegrams.",

year = "1988",

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doi = "10.1117/12.942074",

language = "English (US)",

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AU - Hege, E. Keith

AU - McCarthy, Donald W.

AU - Hebden, J. C.

N1 - Funding Information: This work was supported in part by NSF grant AST-8519506. We are particularly greatful to Dan Blanco for the design of the new articulated beam combiner and to John Montgomery for the computer codes which provide the necessary coordinated secondary/beam combiner control for maintaining cophasing and coalignment simultaneously. We also appreciate the competent, willing, courteous support of the MMTO technical group in the continuing development and operation of the telescope. Ron Watkins and Shaun Cox provided assistance with the digitization and reductions of the video specklegrams.

PY - 1988/1/29

Y1 - 1988/1/29

N2 - The 6.86 m Multiple Mirror Telescope (MMT) has been operated as a coherently cophased interferometric imaging array since 1983. PSF observations at wavelengths from 410 to 850 nm reveal characteristics which must be controlled to achieve reliable imaging at resolutions less than 75 nanoradians (0.015 arc seconds). The MMT has been used to acquire differential speckle images of Alpha Orionis in the H-alpha line and a nearby “continuum” bandpass at 656.9 nm. Broadband images of a 12th magnitude geosynchronous communications satellite, from which shape and size measures have been obtained with 100 nm resolution, give evidence of the capability of the MMT in speckle imaging applications. We have recently extended the cophasing capability to infrared wavelengths by providing reflective pathlength compensation capability.

AB - The 6.86 m Multiple Mirror Telescope (MMT) has been operated as a coherently cophased interferometric imaging array since 1983. PSF observations at wavelengths from 410 to 850 nm reveal characteristics which must be controlled to achieve reliable imaging at resolutions less than 75 nanoradians (0.015 arc seconds). The MMT has been used to acquire differential speckle images of Alpha Orionis in the H-alpha line and a nearby “continuum” bandpass at 656.9 nm. Broadband images of a 12th magnitude geosynchronous communications satellite, from which shape and size measures have been obtained with 100 nm resolution, give evidence of the capability of the MMT in speckle imaging applications. We have recently extended the cophasing capability to infrared wavelengths by providing reflective pathlength compensation capability.

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Diffraction-Limited Imaging With The Coherently Cophased Mmt

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