TY - JOUR
T1 - High harmonics with controllable polarization by a burst of linearly-polarized driver pulses
AU - Neufeld, Ofer
AU - Bordo, Eliyahu
AU - Fleischer, Avner
AU - Cohen, Oren
N1 - Publisher Copyright:
© 2017 by the author.
PY - 2017/6/1
Y1 - 2017/6/1
N2 - 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.
AB - 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.
KW - Dynamical symmetry
KW - High harmonic generation
KW - UV optics
KW - Ultrafast spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85030858755&partnerID=8YFLogxK
U2 - 10.3390/photonics4020031
DO - 10.3390/photonics4020031
M3 - 文章
AN - SCOPUS:85030858755
SN - 2304-6732
VL - 4
JO - Photonics
JF - Photonics
IS - 2
M1 - 31
ER -