  Beginning with a continuous wave laser at 1064 nm, we generate a 30 GHz
electro-optic frequency comb which contains 100 lines spanning 3 THz. The
initial comb is subsequently amplified, spectrally broadened in normal
dispersion photonic crystal fiber, and then temporally compressed to provide 74
fs pulses with average power of up to 2.6 W. When launched into a second
photonic crystal fiber with anomalous dispersion, a supercontinuum spanning
800-1350 nm is generated. Second harmonic generation allows for extension of
the 30 GHz comb into the visible, yielding greater than 300 THz of total
spectral bandwidth. Such a broad bandwidth, high repetition rate comb is a
compelling source for astronomical spectrograph calibration.
