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Open AccessArticle

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

1
Solid State Institute and Physics Department, Technion—Israel Institute of Technology, Haifa 32000, Israel
2
Department of Physics and Optical Engineering, Ort Braude College, Karmiel 21982, Israel
*
Author to whom correspondence should be addressed.
Photonics 2017, 4(2), 31; https://doi.org/10.3390/photonics4020031
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)
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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MDPI and ACS Style

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. https://doi.org/10.3390/photonics4020031

AMA Style

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. https://doi.org/10.3390/photonics4020031

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. https://doi.org/10.3390/photonics4020031

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