  SCALES (Santa Cruz Array of Lenslets for Exoplanet Spectroscopy) is a 2-5
micron high-contrast lenslet integral-field spectrograph (IFS) driven by
exoplanet characterization science requirements and will operate at W. M. Keck
Observatory. Its fully cryogenic optical train uses a custom silicon lenslet
array, selectable coronagraphs, and dispersive prisms to carry out integral
field spectroscopy over a 2.2 arcsec field of view at Keck with low ($<300$)
spectral resolution. A small, dedicated section of the lenslet array feeds an
image slicer module that allows for medium spectral resolution ($5000-10 000$),
which has not been available at the diffraction limit with a coronagraphic
instrument before. Unlike previous IFS exoplanet instruments, SCALES is capable
of characterizing cold exoplanet and brown dwarf atmospheres ($<600$ K) at
bandpasses where these bodies emit most of their radiation while capturing
relevant molecular spectral features.
