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6 July 2006 Focusing a NIR adaptive optics imager; experience with GSAOI
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthew Doolan, Gabe Bloxham, Peter Conroy, Damien Jones, Peter McGregor, Dejan Stevanovic, Jan Van Harmelen, Liam E. Waldron, Mark Waterson, and Ross Zhelem "Focusing a NIR adaptive optics imager; experience with GSAOI", Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62732D (6 July 2006);


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