The Polarization and Efficiency of the Terahertz Pulses Generated by Tilted-Pulse-Front Pumping Scheme

摘要

Optical rectification of laser pulses in LiNbO_3 by tilted-pulse-front pumping(TPFP) is a powerful way to generate terahertz(THz) pulses. However, comprehensive theoretical analysis is still lack. In this work, we first established and presented a detailed theoretical model for TPFP scheme, which then was used to analyze the pump beam polarization dependent terahertz pulses generated by this scheme. The terahertz pulses polarization and generation efficiency for various pump beam polarization angle were investigated by using nonlinear susceptibility tensor of LiNbO_3 crystal. The results indicate that one can change the polarization state of the terahertz pulse by changing the pump beam polarization.