Determination of the phase of terahertz few-cycle laser pulses.
We propose an approach to determine the carrier-envelope phase (CEP) of a terahertz few-cycle pulse by observing the field-free molecular orientation. We find that the degree of orientation sensitively depends on the CEP, providing a new route for measuring the CEP without phase ambiguity. By taking advantage of the field-free molecular orientation, an important effect of the CEP drift caused by the dephasing of the generating medium on the accurate measurement of the CEP value is eliminated.
Shu
Chuan-Cun
CC
Department of Physics, Dalian University of Technology, Dalian 116024, China.
Yuan
Kai-Jun
KJ
Hu
Wen-Hui
WH
Cong
Shu-Lin
SL
D001703:Biophysics / Q000379:methods; D003198:Computer Simulation; D004574:Electromagnetic Fields; D004867:Equipment Design; D007834:Lasers; D008027:Light; D055095:Optics and Photonics; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D055053:Terahertz Radiation; D013997:Time Factors