Fractional high-order harmonic combs and energy tuning by attosecond-precision 
split-spectrum pulse control

Raith, Philipp; Ott, Christian; Anderson, Christopher P.; Kaldun, Andreas; Meyer, Kristina; Laux, Martin; Zhang, Yizhu; Pfeifer, Thomas

doi:10.1063/1.3693615

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Fractional high-order harmonic combs and energy tuning by attosecond-precision split-spectrum pulse control

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Raith, Philipp
Thomas Pfeifer - Independent Junior Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Ott, Christian
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Kaldun, Andreas
Thomas Pfeifer - Independent Junior Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Laux, Martin
Thomas Pfeifer - Independent Junior Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Pfeifer, Thomas
Thomas Pfeifer - Independent Junior Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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http://link.aip.org/link/doi/10.1063/1.3693615
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Citation

Raith, P., Ott, C., Anderson, C. P., Kaldun, A., Meyer, K., Laux, M., et al. (2012). Fractional high-order harmonic combs and energy tuning by attosecond-precision split-spectrum pulse control. Applied Physics Letters, 100(12): 121104, pp. 1-5. doi:10.1063/1.3693615.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-8B2F-4

Abstract

We experimentally control high-order harmonic generation by applying a versatile few-cycle pulse-shape control method: splitting up a single broadband continuous laser spectrum into two sections and applying sub-femtosecond relative time delays. For certain time delays, fractional high-harmonic combs (noninteger harmonics) are generated which we find to result from the controlled interference of two attosecond pulse trains. We also observe time-delay-dependent energy-tunability of the high-order harmonics for an asymmetrically split spectrum consisting of a strong and a weak component. The tuning mechanism is quantitatively understood by the controlled modulation of the instantaneous driver frequency at the peak of the shaped laser pulse.