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Ion beam figuring of small BK7 and Zerodur optics : thermal effects
Gailly, Patrick; Collette, Jean-Paul; Renson, Luc et al.
1999In Geyl, Roland; Maxwell, Jonathan (Eds.) Optical Fabrication and Testing, Proc. SPIE Volume: 3739
 

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Keywords :
ion beam figuring; infrared camera; thermal; IBF; thermographs
Abstract :
[en] optics these last years. One of the disadvantages of ion figuring is the high surface temperature of the workpiece. Temperature aspects have already been mentioned by some authors but are weakly detailed. Therefore thermal effects on BK7 and Zerodur, mainly surface figure distortions and surface temperature measurements, have been investigated here in more detail. Distortion of the optical figure due to high temperature and temperature gradients induced by ion figuring is described. High figure distortion has been observed on 10 cm diameter BK7 samples. Distortions can also be observed on Zerodur samples (although much weaker). Differences between BK7 and Zerodur distortions are discussed. In order to analyse the nonuniform heating of the workpiece during ion bombardment, the surface temperature has been monitored with an infrared camera. Furthermore, surface temperature measurements with respect to ion beam parameters have also been performed. All these measurements show the necessity to care about thermal aspects during ion beam figuring for some sensible materials like BK7, but even for low expansion material like Zerodur.
Disciplines :
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Gailly, Patrick ;  Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Collette, Jean-Paul
Renson, Luc
Tock, Jean-Philippe
Language :
English
Title :
Ion beam figuring of small BK7 and Zerodur optics : thermal effects
Publication date :
06 September 1999
Event name :
SPIE/Europto conference 1999
Event organizer :
SPIE
Event place :
Berlin, Germany
Event date :
May 1999
Audience :
International
Main work title :
Optical Fabrication and Testing, Proc. SPIE Volume: 3739
Editor :
Geyl, Roland
Maxwell, Jonathan
ISBN/EAN :
9780819432131
Collection name :
Proceedings of SPIE Volume: 3739
Pages :
124-131
Name of the research project :
Etude du polissage ionique (II)
Funders :
DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie [BE]
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