Publication Date:
2018-06-13
Description:
We investigate the influence of chirp on carrier-envelope-phase (CEP)-dependent strong-field few-cycle laser-induced photoelectron spectra of sodium, well within the multiphoton regime. Our measurements and analytical model of this process reveal a simple chirp-dependence, which has the potential to be utilized as an online monitor of laser chirp. Moreover, this effect could extend single-shot measurements of the CEP using above-threshold ionization to longer, chirped pulses, and significantly lower the required pulse energies. Specifically, at a wavelength of 775 nm and an intensity of ##IMG## [http://ej.iop.org/images/1367-2630/20/6/063018/njpaac3caieqn1.gif] {$6.5\times {10}^{12}\,{\rm{W}}/{\mathrm{cm}}^{2}$} the CEP- and energy-dependent left-right asymmetries of emitted electrons are measured in a time-of-flight spectrometer. In these asymmetry maps, inclined stripe-like structures emerge, where the inclination is tunable with the chirp of the pulse. W...
Electronic ISSN:
1367-2630
Topics:
Physics
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