Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields | Zendy

KiYong Kim | Zendy; J. H. Glownia | Zendy; Antoinette J. Taylor | Zendy; G. Rodríguez | Zendy

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Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields

Author(s) -

KiYong Kim,

J. H. Glownia,

Antoinette J. Taylor,

G. Rodríguez

Publication year - 2007

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.15.004577

Subject(s) - terahertz radiation , laser , optics , photomixing , terahertz spectroscopy and technology , electric field , ultrashort pulse , terahertz gap , photocurrent , physics , electromagnetic pulse , far infrared laser , optoelectronics , materials science , terahertz metamaterials , quantum mechanics

A transient photocurrent model is developed to explain coherent terahertz emission from air irradiated by a symmetry-broken laser field composed of the fundamental and its second harmonic laser pulses. When the total laser field is asymmetric across individual optical cycles, a nonvanishing electron current surge can arise during optical field ionization of air, emitting a terahertz electromagnetic pulse. Terahertz power scalability is also investigated, and with optical pump energy of tens of millijoules per pulse, peak terahertz field strengths in excess of 150 kV/cm are routinely produced.

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