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Photonics 2017, 4(2), 31;

High Harmonics with Controllable Polarization by a Burst of Linearly-Polarized Driver Pulses

Solid State Institute and Physics Department, Technion—Israel Institute of Technology, Haifa 32000, Israel
Department of Physics and Optical Engineering, Ort Braude College, Karmiel 21982, Israel
Author to whom correspondence should be addressed.
Received: 3 March 2017 / Revised: 8 April 2017 / Accepted: 13 April 2017 / Published: 17 April 2017
(This article belongs to the Special Issue Extreme UV Lasers: Technologies and Applications)
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We 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
Keywords: high harmonic generation; ultrafast spectroscopy; UV optics; dynamical symmetry high harmonic generation; ultrafast spectroscopy; UV optics; dynamical symmetry

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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.

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