Abstract:Experimental results on an all-fiber, all-normal dispersion ytterbium ring laser are reported. It produces stable mode-locking of ∼ 10 ps pulses that can be externally compressed to as short as ∼ 200 fs.Relative intensity, a.u. Measured (red filled curves) and fitted (black lines) autocorrelation functions with the spectrum in the inset

Abstract:We experimentally and numerically investigated the impact of input pump pulse duration on the near-infrared bandwidth of supercontinuum generation in a photonic crystal fiber. We continuously stretched the temporal duration of the input pump laser (centered at 1030 nm) pulses from 500 fs up to 10 ps, while keeping fixed the pump peak power. We observed that the long-wavelength edge of the supercontinuum spectrum is increased by 200 nm as the pump pulse duration grows from 500 fs to 10 ps. We provide a quantitative fit of the experimental results by means of numerical simulations. Moreover, we have explained the observed spectral broadening enhancement induced by pump pulse energy by developing an approximate yet fully analytical model for soliton energy exchange through a series of collisions in the presence of stimulated Raman scattering.

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We investigate experimentally and theoretically the impact of input pulse width varying from 500 fs to 10 ps on supercontinuum generation. We show that the spectral broadening is dramatically extended for the longer input pulses.

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