Final laboratory results of visible nulling with dielectric plates

Rhonda M. Morgan, James H Burge, Neville Woolf

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

Nullng stellar interferometry may enable the discovery of earth-like planets around other stars. In nulling mode, the zero order fringe is destructive and on axis, thus cancelling light form a bright source and allowing detection of dimer off-axis features. To create a deep on-axis null, the phase must be shifted half a wave achromatically over a broad band. The phase shift is created by adding optical path thickness with dielectric plates. Plates of different materials can balance dispersion. The nulling solutions found for TPF (infrared) and SIM (visible)are promising. This paper presents the final results of a dissertation that developed a nulling beam combiner testbed. The deepest null achieved over the spectral region of 600 to 800 nm was 7×10-3. The test bed revealed the extreme challenges of this technique and provided very valuable lessons to enable further implementations. The testbed first achromatized the null by actively controlling the optical thicknesses of the plates. The phase as a function of wavelength was measured by PSI on a spectrally dispersed fringe. The phase was fit to a model to determine the optical thicknesses. The eigenfunctions of the model were nearly collinear and consequently the dynamic range required of the phase data was very high and not supported by the hardware. The testbed then searched for the null fringe and locked on the null using a 300 Hz servo loop and on a grey fringe. The OPD was stabilized to 6 nm peak-to valley.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsW.A. Traub
Pages644-655
Number of pages12
Volume4838
Edition1
DOIs
StatePublished - 2002
EventInterferometry for Optical Astronomy II - Waikoloa, HI, United States
Duration: Aug 22 2002Aug 28 2002

Other

OtherInterferometry for Optical Astronomy II
CountryUnited States
CityWaikoloa, HI
Period8/22/028/28/02

Fingerprint

Testbeds
optical thickness
SIM
test stands
Planets
optical paths
Interferometry
Phase shift
Eigenvalues and eigenfunctions
Dimers
Computer hardware
Stars
dynamic range
valleys
interferometry
eigenvectors
hardware
phase shift
Earth (planet)
dimers

Keywords

  • Dispersion
  • High dynamic range detection
  • Nulling
  • Phase shifting interferometry

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Morgan, R. M., Burge, J. H., & Woolf, N. (2002). Final laboratory results of visible nulling with dielectric plates. In W. A. Traub (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (1 ed., Vol. 4838, pp. 644-655) https://doi.org/10.1117/12.459341

Final laboratory results of visible nulling with dielectric plates. / Morgan, Rhonda M.; Burge, James H; Woolf, Neville.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / W.A. Traub. Vol. 4838 1. ed. 2002. p. 644-655.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Morgan, RM, Burge, JH & Woolf, N 2002, Final laboratory results of visible nulling with dielectric plates. in WA Traub (ed.), Proceedings of SPIE - The International Society for Optical Engineering. 1 edn, vol. 4838, pp. 644-655, Interferometry for Optical Astronomy II, Waikoloa, HI, United States, 8/22/02. https://doi.org/10.1117/12.459341
Morgan RM, Burge JH, Woolf N. Final laboratory results of visible nulling with dielectric plates. In Traub WA, editor, Proceedings of SPIE - The International Society for Optical Engineering. 1 ed. Vol. 4838. 2002. p. 644-655 https://doi.org/10.1117/12.459341
Morgan, Rhonda M. ; Burge, James H ; Woolf, Neville. / Final laboratory results of visible nulling with dielectric plates. Proceedings of SPIE - The International Society for Optical Engineering. editor / W.A. Traub. Vol. 4838 1. ed. 2002. pp. 644-655
@inproceedings{29079fc881f146e192a193c87f30dfa4,
title = "Final laboratory results of visible nulling with dielectric plates",
abstract = "Nullng stellar interferometry may enable the discovery of earth-like planets around other stars. In nulling mode, the zero order fringe is destructive and on axis, thus cancelling light form a bright source and allowing detection of dimer off-axis features. To create a deep on-axis null, the phase must be shifted half a wave achromatically over a broad band. The phase shift is created by adding optical path thickness with dielectric plates. Plates of different materials can balance dispersion. The nulling solutions found for TPF (infrared) and SIM (visible)are promising. This paper presents the final results of a dissertation that developed a nulling beam combiner testbed. The deepest null achieved over the spectral region of 600 to 800 nm was 7×10-3. The test bed revealed the extreme challenges of this technique and provided very valuable lessons to enable further implementations. The testbed first achromatized the null by actively controlling the optical thicknesses of the plates. The phase as a function of wavelength was measured by PSI on a spectrally dispersed fringe. The phase was fit to a model to determine the optical thicknesses. The eigenfunctions of the model were nearly collinear and consequently the dynamic range required of the phase data was very high and not supported by the hardware. The testbed then searched for the null fringe and locked on the null using a 300 Hz servo loop and on a grey fringe. The OPD was stabilized to 6 nm peak-to valley.",
keywords = "Dispersion, High dynamic range detection, Nulling, Phase shifting interferometry",
author = "Morgan, {Rhonda M.} and Burge, {James H} and Neville Woolf",
year = "2002",
doi = "10.1117/12.459341",
language = "English (US)",
volume = "4838",
pages = "644--655",
editor = "W.A. Traub",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",
edition = "1",

}

TY - GEN

T1 - Final laboratory results of visible nulling with dielectric plates

AU - Morgan, Rhonda M.

AU - Burge, James H

AU - Woolf, Neville

PY - 2002

Y1 - 2002

N2 - Nullng stellar interferometry may enable the discovery of earth-like planets around other stars. In nulling mode, the zero order fringe is destructive and on axis, thus cancelling light form a bright source and allowing detection of dimer off-axis features. To create a deep on-axis null, the phase must be shifted half a wave achromatically over a broad band. The phase shift is created by adding optical path thickness with dielectric plates. Plates of different materials can balance dispersion. The nulling solutions found for TPF (infrared) and SIM (visible)are promising. This paper presents the final results of a dissertation that developed a nulling beam combiner testbed. The deepest null achieved over the spectral region of 600 to 800 nm was 7×10-3. The test bed revealed the extreme challenges of this technique and provided very valuable lessons to enable further implementations. The testbed first achromatized the null by actively controlling the optical thicknesses of the plates. The phase as a function of wavelength was measured by PSI on a spectrally dispersed fringe. The phase was fit to a model to determine the optical thicknesses. The eigenfunctions of the model were nearly collinear and consequently the dynamic range required of the phase data was very high and not supported by the hardware. The testbed then searched for the null fringe and locked on the null using a 300 Hz servo loop and on a grey fringe. The OPD was stabilized to 6 nm peak-to valley.

AB - Nullng stellar interferometry may enable the discovery of earth-like planets around other stars. In nulling mode, the zero order fringe is destructive and on axis, thus cancelling light form a bright source and allowing detection of dimer off-axis features. To create a deep on-axis null, the phase must be shifted half a wave achromatically over a broad band. The phase shift is created by adding optical path thickness with dielectric plates. Plates of different materials can balance dispersion. The nulling solutions found for TPF (infrared) and SIM (visible)are promising. This paper presents the final results of a dissertation that developed a nulling beam combiner testbed. The deepest null achieved over the spectral region of 600 to 800 nm was 7×10-3. The test bed revealed the extreme challenges of this technique and provided very valuable lessons to enable further implementations. The testbed first achromatized the null by actively controlling the optical thicknesses of the plates. The phase as a function of wavelength was measured by PSI on a spectrally dispersed fringe. The phase was fit to a model to determine the optical thicknesses. The eigenfunctions of the model were nearly collinear and consequently the dynamic range required of the phase data was very high and not supported by the hardware. The testbed then searched for the null fringe and locked on the null using a 300 Hz servo loop and on a grey fringe. The OPD was stabilized to 6 nm peak-to valley.

KW - Dispersion

KW - High dynamic range detection

KW - Nulling

KW - Phase shifting interferometry

UR - http://www.scopus.com/inward/record.url?scp=0037724074&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037724074&partnerID=8YFLogxK

U2 - 10.1117/12.459341

DO - 10.1117/12.459341

M3 - Conference contribution

AN - SCOPUS:0037724074

VL - 4838

SP - 644

EP - 655

BT - Proceedings of SPIE - The International Society for Optical Engineering

A2 - Traub, W.A.

ER -