Affiliation:
1. Northwest Normal University
2. Lanzhou Jiaotong University
Abstract
When compared with other laser configurations, stronger terahertz (THz) waves can be generated from gaseous plasmas driven using two-color
ω
+
2
ω
circularly polarized laser fields with the same helicity (CP-S), but consideration of the THz polarization state shows that these waves are linearly polarized. Here, we show that polarization-controlled THz radiation, including circularly polarized radiation, can be generated using CP-S pump fields. Unlike the conventional multi-cycle
800
n
m
+
400
n
m
combination, we use longer-wavelength or few-cycle laser pulses to generate nonzero net currents along two orthogonal directions with a
∼
±
π
/
2
phase difference between them because of laser field symmetry breaking. When the current distribution’s axis of symmetry is ascertained, the THz polarization direction can be confirmed.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Gansu Province
Subject
Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics
Cited by
9 articles.
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