Product category:
Materials and components
News Release from: Optical Surfaces
Edited by the Engineeringtalk Editorial
Team on 13 May 2005
French observatory orders optics for
Sophie
The Observatoire de Haute-Provence (St Michel, Marseille, France) has purchased a series of high precision optics from Optical Surfaces.
The Observatoire de Haute-Provence (St Michel, Marseille, France) has purchased a series of high precision optics from Optical Surfaces The optical components including spherical mirror, Schmidt plate, perforated flat and a cross dispersing prism form the key elements of a high-resolution (70,000) Schmidt camera system which will enable researchers to extend the capabilities of the observatory's 1.93 metre telescope to observe astroseismological phenomena and extrasolar planets
This article was originally published on Engineeringtalk on 8 Jun 2007 at 8.00am (UK)
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The camera is an f3.6 folded Schmidt design to be used with the Sophie echelle grating working from 387 to 696nm.
Having previously supplied similar optics for a series of astrophysics groups including the Wyffos, Feros and Narval projects, Optical Surfaces was selected for its proven record in manufacturing, mounting and testing demanding high precision spectrograph optics.
To achieve the required resolution the Schmidt camera incorporated a 500mm diameter spherical mirror (1400mm radius) manufactured from Zerodur and surface finished to a uniform lambda/10 p-v.
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Made from BK7 glass, the Schmidt plate supplied was a 320mm diameter aspheric optic designed to depart from spherical by 50 microns.
Measuring only 25mm thick the Schmidt plate required a detailed knowledge of polishing flexible optics.
In addition, Optical Surfaces has supplied a 220 x 270mm cross dispersing prism that sits in front of the echelle grating and a 440mm diameter Zerodur flat mirror specially machined with two irregularly shaped holes to allow the CCD camera and the fibre optics to operate through it.
Sophie will be the new spectrograph aimed at replacing the current Elodie design.
The new spectrograph will use the radial velocity technique, which allowed the discovery of the first extrasolar planet 10 years ago.
Drawing on the high quality of the supplied component optics, Sophie should achieve a total throughput of 5 to 10% depending on operating resolution and measurement wavelength.
Offering approximately 3 orders of magnitude better throughput and higher resolution than the current spectrograph the OHP is looking to widen the star sample currently observed, detect fainter planetary objects and spectroscopically observe planetary atmospheres as well as galactical structures.
Optical Surfaces ISO9001:2000 approved manufacturing facility provides the flexible resources to supply from single specialist requirements to OEM quantity high precision optics and optical systems.
All optics and optical systems are provided with a complete quality test assurance report.
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