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Experimental studies of the coherence of microstructure-fiber supercontinuum

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Abstract

The phase coherence of supercontinuum generation in microstructure fiber is quantified by performing a Young’s type interference experiment between independently generated supercontinua from two separate fiber segments. Analysis of the resulting interferogram yields the wavelength dependence of the magnitude of the mutual degree of coherence, and a comparison of experimental results with numerical simulations suggests that the primary source of coherence degradation is the technical noise-induced fluctuations in the injected peak power.

©2003 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1. Spectral interference of a generated SC with the Ti:Sapphire pump pulse. Shown in the plot are the spectra of: the microstructure-fiber SC (green line), the Ti:Sapphire output (blue line), and the interference spectrum of the two (black line). The inset shows an expanded section of the interference spectrum around 795 nm.
Fig. 2.
Fig. 2. Schematic diagram of the Young’s double-slit-type setup. In the diagram: λ/2-wp, half-waveplates; MS 1 and MS 2, microstructure fiber segments.
Fig. 3.
Fig. 3. Measured spatially resolved interferograms for (a) shorter- and (b) longerwavelength sections of the SC.
Fig. 4.
Fig. 4. (a) Experimentally measured SC spectra from each fiber (bottom), the visibility extracted from the interferogram between the two SC (middle) and the corresponding calculated degree of coherence (top). (b) corresponding results from simulations. The visibility drops near the edge of the SC spectra, due to the poor signal-to-noise ratio. The injected pulse energies are 0.25 nJ and 0.58 nJ, for the two SC pulses respectively.
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