Generation of 045-138 μm visible to near-infrared widely broadened supercontinuum using Er-doped ultrashort-pulse fiber laser system

Abstract

Visible to near-infrared, widely broadened supercontinuum generation is demonstrated using an ultrashort-pulse fiber laser system. A 229 mW, 83 fs high-power ultrashort pulse was generated at 1550 nm in an Er-doped fiber-chirped pulse amplification system. An almost pedestal-free 107 fs second-harmonic pulse was generated at 780 nm using periodically poled LiNbO3. A 0.45-1.38 μm widely broadened supercontinuum was generated in a highly nonlinear photonic crystal fiber. In terms of spectral flatness, the total modulation bandwidth was within 14 dB. All of the fiber devices were fusion spliced so that the system showed good stability. The effect of a pulse-trapping phenomenon in the supercontinuum generation process was discussed from experimental considerations.