2005
DOI: 10.1364/opex.13.002394
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10^-7 contrast ratio at 4.5 lambda/D: New results obtained in laboratory experiments using nano-fabricated coronagraph and multi-Gaussian shaped pupil masks

Abstract: Abstract:We present here new experimental results on high contrast imaging of 10 -7 at 4.5λ/D (λ=0.820 microns) by combining a circular focal plane mask (coronagraph) of 2.5λ/D diameter and a multi-Gaussian pupil plane mask. Both the masks were fabricated on very high surface quality (λ/30) BK7 optical substrates using nano-fabrication techniques of photolithography and metal lift-off. This process ensured that the shaped masks have a useable edge roughness better than λ /4 (rms error better than 0.2 microns),… Show more

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Cited by 12 publications
(9 citation statements)
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“…This multi-stage approach was also recently considered for coronagraphy with a combination of a classical Lyot coronagraph and a shaped pupil mask (Chakraborty et al 2005). Another way consists in combining nulling interferometry and coronagraphy (Nishikawa et al 2005).…”
Section: Approachmentioning
confidence: 99%
“…This multi-stage approach was also recently considered for coronagraphy with a combination of a classical Lyot coronagraph and a shaped pupil mask (Chakraborty et al 2005). Another way consists in combining nulling interferometry and coronagraphy (Nishikawa et al 2005).…”
Section: Approachmentioning
confidence: 99%
“…This is a convenient location to insert coronagraphic pupil masks. Chakraborty et al (2005) placed a Gaussian-shaped pupil mask here to conduct lab-bench coronagraphic imaging tests. Because the UnISIS optics table is easy to access, a wide variety of coronographic configurations can be easily swapped in and out.…”
Section: Unisis Optical Designmentioning
confidence: 99%
“…(This picture is a great simplification, as Airy rings are generally both suppressed and shifted in position by a coronagraph, but it provides a useful framework for gross estimation of Airy amplitudes.) Coronagraph contrast of 10 -7 at 4.5λ/D has been reported 16 , roughly equivalent to R=7800.…”
mentioning
confidence: 92%