The heart of the AvaSpec fiber optic spectrometer is an opti-
cal bench with 45 or 75 mm focal length, developed in a sym-
metrical Czerny-Turner design (figure 1).
Light enters the optical bench through a standard SMA905
connector and is collimated by a spherical mirror. A plane
grating diffracts the collimated light; a second spherical mir-
ror focuses the resulting diffracted light. An image of the
spectrum is projected onto a 1-dimensional linear detector
array.