Abstract
A hollow-core photonic-crystal fiber (PCF) is integrated with a stretched-pulse ytterbium fiber oscillator to enable ultrafast optical waveform shaping, demonstrated through the pulse compression of single-pulse fiber-laser output and tunable ultrashort-pulse pair generation in the regime where the fiber laser delivers a double-pulse output. A hollow PCF with a properly designed dispersion profile is shown to allow the stretched 6.2-ps Yb fiber laser output to be compressed to a pulse width of less than 160 fs, which is only 6% longer than the pulse width supported by the entire 18-nm bandwidth of the fiber laser output.
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