TY - GEN
T1 - Optical design for the TAIPAN and HECTOR transmissive spectrographs
AU - Content, Robert
AU - Lawrence, Jon
AU - Gers, Luke
AU - Zhelem, Ross
PY - 2016
Y1 - 2016
N2 - TAIPAN is a multi-fibre project for the UK-Schmidt Telescope and Hector is a multi-IFU project for the Anglo- Australian Telescope (AAT) using fibres. Many different transparent designs were studied covering a large parameter space. An important trade-off study was between the use of microlenses on the slit or just bare fibres. Microlenses have disadvantages but permit considerable simplification of the collimator by making the beam very slow. The disadvantages are more important with the UK-Schmidt due to the faster beam from the telescope. With microlenses, the collimator can be a unique spherical plano-convex lens significantly smaller than the mirror that would be needed in a reflective design. For Hector, 26 different camera designs where done to cover the parameter space for 2k x 2k, 2k x 4k, or 4k x 4k detectors, and for 50, 75 or 100 micron fibre cores, with or without microlenses, with a triplet in the camera or a doublet plus singlet, and with a maximum wavelength of 1 or 1.05 microns. Not all combinations were designed but for each parameter there are at least two representative cameras with all other parameters identical. A preliminary cost estimate was made for the most promising designs which permitted to reduce them to 3 for more detailed designing. Also, a theoretical study was done of the PSF obtained with highly packed microlenses at the slit with no space between them and imaging to 2 pixels per microlenses. This maximizes the number of fibres per spectrograph, and thus the total field of view of all IFUs together, but it comes with some disadvantages.
AB - TAIPAN is a multi-fibre project for the UK-Schmidt Telescope and Hector is a multi-IFU project for the Anglo- Australian Telescope (AAT) using fibres. Many different transparent designs were studied covering a large parameter space. An important trade-off study was between the use of microlenses on the slit or just bare fibres. Microlenses have disadvantages but permit considerable simplification of the collimator by making the beam very slow. The disadvantages are more important with the UK-Schmidt due to the faster beam from the telescope. With microlenses, the collimator can be a unique spherical plano-convex lens significantly smaller than the mirror that would be needed in a reflective design. For Hector, 26 different camera designs where done to cover the parameter space for 2k x 2k, 2k x 4k, or 4k x 4k detectors, and for 50, 75 or 100 micron fibre cores, with or without microlenses, with a triplet in the camera or a doublet plus singlet, and with a maximum wavelength of 1 or 1.05 microns. Not all combinations were designed but for each parameter there are at least two representative cameras with all other parameters identical. A preliminary cost estimate was made for the most promising designs which permitted to reduce them to 3 for more detailed designing. Also, a theoretical study was done of the PSF obtained with highly packed microlenses at the slit with no space between them and imaging to 2 pixels per microlenses. This maximizes the number of fibres per spectrograph, and thus the total field of view of all IFUs together, but it comes with some disadvantages.
KW - multi-object spectrographs
KW - multi-integral-field spectrographs
KW - fibre fed
KW - microlenses on slit
UR - http://www.scopus.com/inward/record.url?scp=85007273859&partnerID=8YFLogxK
U2 - 10.1117/12.2232268
DO - 10.1117/12.2232268
M3 - Conference proceeding contribution
AN - SCOPUS:85007273859
T3 - Proceedings of SPIE
SP - 1
EP - 10
BT - Ground-based and Airborne Instrumentation for Astronomy VI
A2 - Evans, Christopher J.
A2 - Simard, Luc
A2 - Takami, Hideki
PB - SPIE
CY - Bellingham, Washington
T2 - Ground-Based and Airborne Instrumentation for Astronomy VI
Y2 - 26 June 2016 through 30 June 2016
ER -