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Journal Article

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

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Schwefel,  Harald G. L.
Whispering Gallery Mode Resonator, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Kozlov, M., Kfir, O., Fleischer, A., Kaplan, A., Carmon, T., Schwefel, H. G. L., et al. (2012). Narrow-bandwidth high-order harmonics driven by long-duration hot spots. NEW JOURNAL OF PHYSICS, 14: 063036. doi:10.1088/1367-2630/14/6/063036.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-68BF-8
Abstract
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.