Contribution of multiple electron trajectories to high-harmonic generation in the few-cycle regime

A. Yu Naumov, D. M. Villeneuve, Hiromichi Niikura

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    We use a few-cycle, carrier-envelope-phase (CEP) stabilized laser system to generate high-harmonic emission in argon, neon, and carbon dioxide. The high-harmonic spectra consist of discrete harmonic orders whose positions shift as a function of the CEP. Near the cutoff harmonic, the peaks are separated by two photon orders, and can correspond to either even or odd harmonics of the driving laser frequency, depending on the value of the CEP. In the plateau region, harmonic orders are separated by only one photon order. We develop a simple model which predicts the observed behavior. We use the observed dependence of the harmonic peaks as a function of CEP as a method to measure the statistical CEP fluctuations of the laser system. The measured rms fluctuation of 0.17 radians agrees with optical measurements. The high-harmonic approach to measuring CEP stability has the advantage that it is less sensitive to laser intensity fluctuations than are optical methods.

    Original languageEnglish
    Article number063421
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Volume91
    Issue number6
    DOIs
    Publication statusPublished - 2015 Jun 26

    Fingerprint

    electron trajectories
    harmonic generations
    harmonics
    cycles
    envelopes
    dioxides
    lasers
    photons
    optical measurement
    neon
    carbon dioxide
    plateaus
    cut-off
    argon
    optics
    shift

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

    Cite this

    Contribution of multiple electron trajectories to high-harmonic generation in the few-cycle regime. / Naumov, A. Yu; Villeneuve, D. M.; Niikura, Hiromichi.

    In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 91, No. 6, 063421, 26.06.2015.

    Research output: Contribution to journalArticle

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