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arXiv · 1310.1196

Phase-dependent interference fringes in the wavelength scaling of harmonic efficiency

I. Yavuz·E. A. Bleda·Z. Altun·T. Topcu
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Abstract

We describe phase-dependent wavelength scaling of high-order harmonic generation efficiency driven by ultra-short laser fields in the mid-infrared. We employ both numerical solution of the time-dependent Schrödinger equation and the Strong Field Approximation to analyze the fine-scale oscillations in the harmonic yield in the context of channel-closing effects. We show, by varying the carrier-envelope phase, that the amplitude of these oscillations depend strongly on the number of returning electron trajectories. Furthermore, the peak positions of the oscillations vary significantly as a function of the carrier-envelope phase. Owing to its practical applications, we also study the wavelength dependence of harmonic yield in the "single-cycle" limit, and observe a smooth variation in the wavelength scaling originating from the vanishing fine-scale oscillations.

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I. Yavuz, E. A. Bleda, Z. Altun, T. Topcu. 2014-04-19. Phase-dependent interference fringes in the wavelength scaling of harmonic efficiency. https://doi.org/10.1103/physreva.89.055801

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