Abstract
A frequency comb is generated with a chromium-doped forsterite femtosecond laser, spectrally broadened in a dispersion-shifted highly nonlinear fiber, and stabilized. The resultant evenly spaced comb of frequencies ranges from 1.1 to beyond . The frequency comb was referenced simultaneously to the National Institute of Standards and Technology’s optical frequency standard based on neutral calcium and to a hydrogen maser that is calibrated by a cesium atomic fountain clock. With this comb we measured two frequency references in the telecommunications band: one half of the frequency of the crossover transition in at 780 nm, and the methane line at 1315 nm.
© 2004 Optical Society of America
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