TY - JOUR
T1 - Narrow-bandwidth high-order harmonics driven by long-duration hot spots
AU - Kozlov, Maxim
AU - Kfir, Ofer
AU - Fleischer, Avner
AU - Kaplan, Alex
AU - Carmon, Tal
AU - Schwefel, Harald G.L.
AU - Bartal, Guy
AU - Cohen, Oren
PY - 2012/6
Y1 - 2012/6
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84863682671&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/14/6/063036
DO - 10.1088/1367-2630/14/6/063036
M3 - 文章
AN - SCOPUS:84863682671
SN - 1367-2630
VL - 14
JO - New Journal of Physics
JF - New Journal of Physics
M1 - 063036
ER -