Control of near-infrared supercontinuum bandwidth by adjusting pump pulse duration

Abstract

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.

Numerical simulations of high power near-infrared supercontinuum generation from a nonlinear fiber amplifier

“…The other reason is the dramatic broadening stage happened for the 10ps pump pulse near z=4.7m in the fiber amplifier and a wider pulse creates better conditions for soliton collisions and SSFS. The simulation results agree with the theory in [18] and the experiments in [10].…”

Многоцветная Многофотонная Микроскопия На Основе Наносекундного Источника Суперконтинуума

“…Спектр фильтруется между 700 нм и 1 000 нм с помощью набора фильтров высоких и низких частот. В результате средняя мощность 120 МВт заводится в вертикальный многофотонный микроскоп Optical Measurements в сторону более длинных длин волн за счет модуляционной неустойчивости, генерации солитонов и сдвига собственной частоты солитонов [28]. В области нормальной дисперсии спектральное уширение индуцируется четырехволновым смешением между солитонами и дисперсионными волнами [29], которые, кроме того, испытывают солитонные столкновения, кросс-фазовую модуляцию и эффект комбинационного рассеяния.…”

Multicolor multiphoton microscopy based on a nanosecond supercontinuum laser source

“…Starting from this preliminary comparison, the available peak powers of both excitation sources are evaluated and compared. The PCF of the SC source is pumped in the anomalous dispersion regime, resulting in the spectral broadening towards longer wavelengths by means of modulation instability, soliton generation and soliton self‐frequency shift . In the normal dispersion domain, the spectral broadening is induced by four‐wave mixing between solitons and dispersive waves , which in addition experience soliton collisions, cross‐phase modulation and the Raman effect.…”