Abstract
We report on the experimental demonstration of a white-light supercontinuum generation in normally dispersive singlemode air-silica microstructured fiber. We demonstrate that the simultaneous excitation of the microstuctured fiber in its normal and anomalous dispersion regimes using the fundamental and second harmonic signals of a passively Q-switched microchip laser leads to a homogeneous supercontinuum in the visible range. This pumping scheme allows the suppression of the cascaded Raman effect predominance in favor of an efficient spectrum broadening induced by parametric phenomena. A flat supercontinuum extended from 400 to 700 nm is achieved.
Highlights
Continuum generation has been widely studied in the past four decades due to the large potential applications such as telecommunications systems, time resolved absorption, spectroscopy, optical metrology or biomedical optics [1]
We report on the experimental demonstration of a white-light supercontinuum generation in normally dispersive singlemode air-silica microstructured fiber
We demonstrate that the simultaneous excitation of the microstuctured fiber in its normal and anomalous dispersion regimes using the fundamental and second harmonic signals of a passively Qswitched microchip laser leads to a homogeneous supercontinuum in the visible range
Summary
Continuum generation has been widely studied in the past four decades due to the large potential applications such as telecommunications systems, time resolved absorption, spectroscopy, optical metrology or biomedical optics [1]. Continuum generation is the result of multiple nonlinear phenomena such as stimulated Raman scattering (SRS), self-phase and cross-phase modulations (SPM and XPM), four wave mixing (FWM), highorder soliton formation and parametric mixing through modal phase matching in the case of multimode optical fibers. All these effects directly affect the continuum homogeneity and occur with different weights, according to the pump wavelength and power and to the chromatic dispersion characteristics of the fiber. The double excitation allows the spectacular inhibition of the cascaded Raman process in favor of FWM and XPM, yielding a white light supercontinuum source ranging from the near UV to the near IR (350-750 nm)
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