Scientific Results

Enhancing the yield of high-order harmonics with an array of gas jets

Year: 2008

Authors: Pirri A., Corsi C., Bellini M.

Autors Affiliation: CNR – Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy;
LENS Firenze, Italy

Abstract: We report the experimental observation of an enhancement in the yield of high-order harmonics using an array of gas jets as the source medium. By comparing the experimental outcome for jet arrays of different spacings with the predicted harmonic intensity in the case of slit sources of equivalent lengths, we clearly show how the periodic modulation of the gas density can improve the harmonic yield. This behavior may be attributed to a quasi-phase-matching effect which increases the length of coherent harmonic buildup during propagation by partially counteracting the dephasing induced by free electrons.

Journal/Review: PHYSICAL REVIEW A

Volume: 78 (1)      Pages from: 011801  to: 011801

KeyWords: Harmonic analysis; Jets; Modulation, American Physical Society (APS); De-phasing; Experimental observations; Free electrons; Gas density; Gas jets; Harmonic intensity; High-order harmonics (HH); Jet arrays; Periodic modulation; Quasi-phase-matching (QPM), Density of gases
DOI: 10.1103/PhysRevA.78.011801

Citations: 61
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English