High Harmonics with Controllable Polarization by a Burst of Linearly-Polarized Driver Pulses
AbstractWe theoretically explore a scheme for generation of bright circularly and elliptically polarized high-order harmonics by bursts of linearly polarized pulses with a rotating polarization axis. Circularly polarized harmonics are formed if the bursts are comprised of N pulses that uphold an N-fold rotational symmetry, for N > 2. Rotating the polarization axes of the comprising pulses can generate elliptical harmonics with a collectively tunable ellipticity, from circular through elliptic to linear. The method preserves the single-cycle, single-atom and macroscopic physics of ‘standard’ linearly polarized high harmonic generation, with a high yield and cutoff energy. We investigate the method from a time-domain perspective, as well as a photonic perspective, and formulate the energy and spin-angular momentum conservation laws for this scheme. We find that the case of N = 4 is optimal for this method, resulting with the highest conversion efficiency of elliptical photons. The new features of this source offer new applications to helical ultrafast spectroscopy and ellipsometry. View Full-Text
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Neufeld, O.; Bordo, E.; Fleischer, A.; Cohen, O. High Harmonics with Controllable Polarization by a Burst of Linearly-Polarized Driver Pulses. Photonics 2017, 4, 31.
Neufeld O, Bordo E, Fleischer A, Cohen O. High Harmonics with Controllable Polarization by a Burst of Linearly-Polarized Driver Pulses. Photonics. 2017; 4(2):31.Chicago/Turabian Style
Neufeld, Ofer; Bordo, Eliyahu; Fleischer, Avner; Cohen, Oren. 2017. "High Harmonics with Controllable Polarization by a Burst of Linearly-Polarized Driver Pulses." Photonics 4, no. 2: 31.