A family of subwavelength grating vortexcoronagraphs (SGVCs) with higher topological charge

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Search: onr:"swepub:oai:DiVA.org:uu-285236" > A family of subwave...

1 of 1
Previous record
Next record
To hitlist

Details
MARC

Delacroix, Christian (author)

A family of subwavelength grating vortexcoronagraphs (SGVCs) with higher topological charge

Article/chapterEnglish2015

Publisher, publication year, extent ...

SPIE,2015
printrdacarrier

Numbers

LIBRIS-ID:oai:DiVA.org:uu-285236
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-285236URI
https://doi.org/10.1117/12.2218637DOI

Supplementary language notes

Language:English
Summary in:English

Part of subdatabase

SwePubSwePub

Classification

Subject category:ref swepub-contenttype
Subject category:kon swepub-publicationtype

Notes

The subwavelength grating vortex coronagraph (SGVC) is a focal-planespiral-like phase mask whose key benefit is to allow high contrast imaging atsmall angles. Directly etched onto a CVD diamond substrate, it is well suitedto perform in the mid-infrared domain. It provides a continuous helicalphase ramp with a dark singularity in its center, and is characterized by itsnumber of phase revolutions, called the topological charge. Over the pasttwo years, we have manufactured several charge-2 SGVCs (a.k.a. annulargroove phase masks) and successfully demonstrated their performanceson 10-m class telescopes (LBT, VLT/NaCo, VLT/VISIR). To prevent stellarleakage on future 30-m class telescopes (E-ELT, TMT, GMT), a broaderoff-axis extinction is required, which can be achieved by increasing thetopological charge. We have recently proposed an original design for acharge-4 SGVC allowing less starlight to leak through the coronagraph, atthe cost of a degraded inner working angle. In this talk, we report on ourlatest development of higher charge SGVCs. From 3D rigorous numericalsimulations using a finite-difference time-domain (FDTD) algorithm, weConference 9605: Techniques and Instrumentationfor Detection of Exoplanets VIIR eturn to Contents +1 360 676 3290 · help@spie.org 647have derived a family of coronagraphs with higher topological charge(SGVC4/6/8). Our new optimization method addresses the principallimitation of such space-variant polarization state manipulation, i.e., theinconvenient discontinuities in the discrete grating pattern. The resultinggratings offer improved precision to the phase modulation compared toprevious designs. Finally, we present our preliminary manufacturing andmetrology results for infrared components down to the K-band.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

Forsberg, PontusUppsala universitet,Tillämpad materialvetenskap(Swepub:uu)ponfo524 (author)
Piron, Pierre (author)
Ruane, Garreth (author)
Huby, Elsa (author)
Carlomagno, Brunella (author)
Jolivet, Aïssa (author)
Vargas Catalan, ErnestoUppsala universitet,Tillämpad materialvetenskap(Swepub:uu)ernva826 (author)
Absil, Olivier (author)
Mawet, Dimitri (author)
Karlsson, MikaelUppsala universitet,Tillämpad materialvetenskap(Swepub:uu)mka11187 (author)
Surdej, Jean (author)
Habraken, Serge (author)
Uppsala universitetTillämpad materialvetenskap (creator_code:org_t)

Related titles

In:Techniques and Instrumentation for Detection of Exoplanets VII: SPIE

Internet link

To the university's database

1 of 1
Previous record
Next record
To hitlist

Find more in SwePub

By the author/editor: Delacroix, Chris ...; Forsberg, Pontus; Piron, Pierre; Ruane, Garreth; Huby, Elsa; Carlomagno, Brun ...; show more...; Jolivet, Aïssa; Vargas Catalan, ...; Absil, Olivier; Mawet, Dimitri; Karlsson, Mikael; Surdej, Jean; Habraken, Serge; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

Articles in the publication: Techniques and I ...

By the university: Uppsala University

Search outside SwePub

Extend your search to:: Google; Google Book Search; Google Scholar

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

LIBRIS.kb.se