Midinfrared broadband achromatic astronomical beam combiner for nulling interferometry

Hsien-kai Hsiao; Kim A. Winick; John D. Monnier

doi:10.1364/AO.49.006675

Midinfrared broadband achromatic astronomical beam combiner for nulling interferometry

Hsien-kai Hsiao, Kim A. Winick, and John D. Monnier

Applied Optics
Vol. 49,
Issue 35,
pp. 6675-6688
(2010)
•https://doi.org/10.1364/AO.49.006675

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Hsien-kai Hsiao, Kim A. Winick, and John D. Monnier, "Midinfrared broadband achromatic astronomical beam combiner for nulling interferometry," Appl. Opt. 49, 6675-6688 (2010)

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Related Topics
Table of Contents Category
- Imaging Systems
Optics & Photonics Topics
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The topics in this list come from the OSA Optics and Photonics Topics applied to this article.
Previously assigned OCIS codes
- Interferometric imaging (110.3175)
- Speckle interferometry, stellar (120.6168)
- Infrared (130.3060)
- Integrated optics devices (130.3120)
- Astronomical optics (350.1260)

About this Article
History
- Original Manuscript: August 16, 2010
- Manuscript Accepted: September 25, 2010
- Published: December 1, 2010

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Abstract

Integrated optic beam combiners offer many advantages over conventional bulk optic implementations for astronomical imaging. To our knowledge, integrated optic beam combiners have only been demonstrated at operating wavelengths below $4 μm$ . Operation in the midinfrared wavelength region, however, is highly desirable. In this paper, a theoretical design technique based on three coupled waveguides is developed to achieve fully achromatic, broadband, polarization-insensitive, lossless beam combining. This design may make it possible to achieve the very deep broadband nulls needed for exoplanet searching.

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Position z	Parameter X	$Δ β$	$κ_{12}$	$κ_{13}$
0	$- \infty$	$< 0$	$\approx 0$	$\approx 0$
$L / 2$	0	0	$κ_{\max}$	$\approx 0$
L	$+ \infty$	$> 0$	$\approx 0$	$\approx 0$

Temperature	$λ (μm)$	n(Si)	n(Ge)
	8	3.4158	4.0048
$20 ° C$	10	3.415	4.0025
	12	3.4145	4.0012

Wavelength	$Ψ_{-}$ TE Mode	$Ψ_{-}$ TM Mode
$8 μm$	$- 34 dB$	$- 24.1 dB$
$10 μm$	$- 82.2 dB$	$- 39.5 dB$
$12 μm$	$- 33.4 dB$	$- 40.6 dB$

Deviation in $κ_{23} (z)$	Deviation in $β_{3} (z)$	$1 - a_{2}^{2} (L)$
0.5%	0%	$- 52.0 dB$
1.0%	0%	$- 46.1 dB$
5.0%	0%	$- 32.3 dB$
0%	0.1%	$- 38.2 dB$
0%	0.5%	$- 24.3 dB$
0%	1.0%	$- 18.3 dB$

Position z	Parameter X	$Δ β$	$κ_{12}$	$κ_{13}$
0	$- \infty$	$< 0$	$\approx 0$	$\approx 0$
$L / 2$	0	0	$κ_{\max}$	$\approx 0$
L	$+ \infty$	$> 0$	$\approx 0$	$\approx 0$

Abstract

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Equations (98)

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