Narrow-bandwidth high-order harmonics driven by long-duration hot spots

Maxim Kozlov*, Ofer Kfir, Avner Fleischer, Alex Kaplan, Tal Carmon, Harald G.L. Schwefel, Guy Bartal, Oren Cohen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We predict and investigate the emission of high-order harmonics by atoms that cross intense laser hot spots that last for a nanosecond or longer. An atom that moves through a nanometer-scale hot spot at characteristic thermal velocity can emit high-order harmonics in a similar fashion to an atom that is irradiated by a short-duration (picosecond-scale) laser pulse. We analyze the collective emission from a thermal gas and from a jet of atoms. In both cases, the line shape of a high-order harmonic exhibits a narrow spike with spectral width that is determined by the bandwidth of the driving laser. Finally, we discuss a scheme for producing long-duration laser hot spots with intensity in the range of the intensity threshold for high-harmonic generation. In the proposed scheme, the hot spot is produced by a long laser pulse that is consecutively coupled to a high-quality micro-resonator and a metallic nano-antenna. This system may be used for generating ultra-narrow bandwidth extreme-ultraviolet radiation through frequency up-conversion of a low-cost compact pump laser.

Original languageEnglish
Article number063036
JournalNew Journal of Physics
StatePublished - Jun 2012
Externally publishedYes


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