Tunable all-fiber optical frequency comb for astronomical calibration with amplitude modulated laser

摘要

A method for generating a frequency comb is described. The frequency comb may be used for calibration of astronomical spectrographs. The method comprises the steps of injecting the light of a laser (1) in a phase modulator (2) to generate new frequency sidebands. Then an amplitude modulator (4) modulates the light to form light pulses, the modulated pulses are amplified in a fiber amplifier (5) and subsequently compressed in an optical fiber (6). Simultaneous amplification and compression takes place in an Er:Yb-doped fiber amplifier (7). The amplified and compressed fs-pulses are spectrally broadened in non-linear tapered optical fiber (8) .