In this presentation, I will be talking about the optical designs and <br /><br />
analyses of the WFMOS high-resolution spectrograph(HRS).<br /><br />
WFMOS HRS is the next generation instrument of the Gemini/Subaru <br /><br />
consortium that aims to conduct spectroscopic studies of the<br /><br />
formation and evolution of the Galaxy, the study often termed as <br /><br />
\\\"Galactic Archaeology Survey\\\". Consisting of twin (or quadruple)<br /><br />
spectrographs, HRS is to be fed by 1500 fiber optics distributed over <br /><br />
the field of view (1.5 degrees in diameter) of the HyperSuprime<br /><br />
Camera (HSC) on the 8m Subaru telescope. The wavelength coverage is <br /><br />
from 420nm to 900nm. Following a brief introduction to the<br /><br />
main science objectives of the HRS instrument, the presentation will <br /><br />
discuss issues involved in the choice of diffraction gratings,<br /><br />
camera optics, and collimator designs as well as trade-off study <br /><br />
results in terms of system throughput and image quality. Current status<br /><br />
and future prospect of the project will also be covered.