Focusing a NIR adaptive optics imager, experience with GSAOI
Date
2006
Authors
Doolan, Matthew
Bloxham, Gabe
Conroy, Peter
Jones, D Heath
McGregor, Peter
Stevanovic, Dejan
van Harmelen, Jan
Waldron, Liam
Waterson, Mark
Zhelem, Ross
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SPIE - The International Society for Optical Engineering
Abstract
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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Keywords
Keywords: Focus techniques; Gemini; Instrumentation; Near infrared; Cryogenics; Optical design; Optical devices; Optical filters; Optical testing; Self assembly; Adaptive optics Focus techniques; Gemini; Instrumentation; Near-infrared
Citation
Matthew Doolan, Gabe Bloxham, Peter Conroy, Damien Jones, Peter McGregor, Dejan Stevanovic, Jan Van Harmelen, Liam E. Waldron, Mark Waterson, Ross Zhelem, "Focusing a NIR adaptive optics imager; experience with GSAOI", Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62732D (6 July 2006); https://doi.org/10.1117/12.670891
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Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62732D (6 July 2006)
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Conference paper
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