HyperSuprime: imaging optics
2006
We summarize the optical design of the wide-field corrector for HyperSuprime which is being considered as a next
generation primefocus camera for
Subaru Telescope. Two optical designs are investigated under several design constraints such as
image quality, field curvature, focal length, etc. The corrector with 2 degree
fieldof
viewattains good
image qualityat the wavelength between 600 nm and 1100 nm although the first lens is large (1.2 m in diameter) and three aspherical surfaces are required. The
image qualityfor shorter wavelength than 600 nm is fair. The incident light blocked at the edge of the field is only 20% and the transmission is more than 80% if the multi-layer coating applied for the current Subaru prime focus corrector is available. The corrector with 1.5 degree
fieldof
viewis designed as a smaller version of 2 degree corrector. The properties and performance of 1.5 degree corrector resemble those of 2 degree corrector, but 1.5 degree corrector has a merit that the focal plane is flat. The availability of large fused-silica blank up to about 200 kg is promising.
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Correction
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