  SCALES is a high-contrast, infrared coronagraphic imager and integral field
spectrograph (IFS) to be deployed behind the W.M. Keck Observatory adaptive
optics system. A reflective optical design allows diffraction-limited imaging
over a large wavelength range (1.0 - 5.0 microns). A microlens array-based IFS
coupled with a lenslet reformatter ("slenslit") allow spectroscopy at both low
(R = 35 - 250) and moderate (R = 2000 - 6500) spectral resolutions. The large
wavelength range, diffraction-limited performance, high contrast coronagraphy
and cryogenic operation present a unique optical design challenge. We present
the full SCALES optical design, including performance modeling and analysis and
manufacturing.
