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Femtosecond soliton pulse delivery at 800nm wavelength in hollow-core photonic bandgap fibers

F. Luan, J. C. Knight, P. St. J. Russell, S. Campbell, D. Xiao, D. T. Reid, B. J. Mangan, D. P. Williams, and P. J. Roberts

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Abstract

We describe delivery of femtosecond solitons at 800nm wavelength over five meters of hollow-core photonic bandgap fiber. The output pulses had a length of less than 300fs and an output pulse energy of around 65nJ, and were almost bandwidth limited. Numerical modeling shows that the nonlinear phase shift is determined by both the nonlinearity of air and by the overlap of the guided mode with the glass.

©2004 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Measured group index and group-velocity dispersion GVD, with inset showing the fiber attenuation. The measured group index points are indicated by crosses: the line is a fit to the data points and is used to derive the dispersion curve.

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Fig. 2.
Fig. 2. (a) Sample autocorrelation traces at low (28nJ – blue curve) and high (62nJ – red curve) pulse energies. (b) Measured autocorrelation widths (FWHM) as a function of output pulse energy.

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Fig. 3.
Fig. 3. Observed output spectra for different output pulse energies.

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Fig. 4.
Fig. 4. Actual (a) and modeled (b) fiber cross-sections, showing the region around the core. (c) shows the intensity pattern of the fundamental guided mode used in the modeling of the nonlinear response.

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Equations (3)

Equations on this page are rendered with MathJax. Learn more.

P 0 = 3.11 λ 3 D A eff 4 π 2 c n 2 τ 2
Δ n eff = P n 2 A eff
Δ n eff = P ∑ i n 2 , i A eff i
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