Open AccessFocusing a NIR adaptive optics imager, experience with GSAOI
Author(s) -
Matthew Doolan,
Gabe Bloxham,
P. Conroy,
Damien Jones,
Peter McGregor,
Dejan Stevanović,
Jan van Harmelen,
L. Waldron,
M. Waterson,
Ross Zhelem
Publication year - 2006
Publication title -
proceedings of spie, the international society for optical engineering/proceedings of spie
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.192
H-Index - 176
eISSN - 1996-756X
pISSN - 0277-786X
DOI - 10.1117/12.670891
Subject(s) - collimated light , optics , adaptive optics , focus (optics) , optical filter , filter (signal processing) , computer science , materials science , point (geometry) , physics , laser , computer vision , geometry , mathematics
The Gemini South Adaptive Optics Imager (GSAOI) to be used with the Multi-Conjugate Adaptive Optics (MCAO) system at Gemini South is currently in the final stages of assembly and testing. GSAOI uses a suite of 26 different filters, made from both BK7 and Fused Silica substrates. These filters, located in a non-collimated beam, work as active optical elements. The optical design was undertaken to ensure that both the filter substrates both focused longitudinally at the same point. During the testing of the instrument it was found that longitudinal focus was filter dependant. The methods used to investigate this are outlined in the paper. These investigations identified several possible causes for the focal shift including substrate material properties in cryogenic conditions and small amounts of residual filter power.
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