Source: http://aoot.osa.org/oe/abstract.cfm?uri=oe-17-20-17636
Timestamp: 2019-04-22 12:34:12+00:00

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We study soliton-effect pulse compression in the single-cycle region in dielectric-coated metallic hollow waveguides filled with a noble gas exploiting the broad region of anomalous dispersion in these waveguides. We predict the compression of a 20-fs pulse to a FWHM duration of 1.7 fs with an energy of 6 µJ and study the physical factors determining the limitations on shortest pulses in the single-cycle regime.
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Fig. 1. Cross-section (a), loss and GVD (b) of an argon-filled metal-dielectric hollow waveguide with a diameter of 60 µm. The silver cladding is coated by a fused-silica layer with thickness a of 40 nm. The loss is shown by the green curve and the GVD is presented for a pressure of 13 atm by the red curve.
Fig. 2. Evolution of the temporal shape (a),(c),(e) and spectrum (b),(d),(f) for a 17-TW/cm2, 20-fs pulse in a waveguide with D=60 µm and a=40 nm. The input wavelength is 1037 nm, the propagation length is 1.9 cm (a),(b), 3.8 cm (c),(d), and 4.74 cm (e),(f).
Fig. 3. Dependence of the output pulse duration on the input pulse duration. The soliton number and the input wavelength, as well as the waveguide parameters are the same as in Fig. 2. The propagation distance is optimized separately for each input duration. The gray curve corresponds to the compression factor Fc =10 predicted by the NSE.
Fig. 4. Dependence of the compression factor F on the input wavelength. The input-pulse soliton number and duration, as well as the waveguide parameters are the same as in Fig. 2. The propagation length is optimized separately for each input wavelength. The green curve shows the wavelength dependence of the TOD parameter.
Fig. 5. Dependence of the compression factor F on the TOD parameter.
Fig. 6. Temporal shapes of the pulse after 4.74 cm propagation for an input CEO of 0 (red solid curve), π/4 (green long-dashed curve), π/2 (blue dash-dotted curve) and 3π/4 (magenta dotted curve).

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