Abstract

Terahertz wave generation from air excited by tightly focused fundamental and second-harmonic pulses of a femtosecond Ti:sapphire laser is analyzed both theoretically and experimentally for various pump pulse energies. Numerical calculations, based on the microscopic polarization model, revealed that the experimentally obtained dependencies of terahertz yield can be well explained taking into account phase shifts of bichromatic pump waves, acquired during free propagation in air, and nonlinear second-harmonic crystal, as well as by considering the Gouy phases of focused laser beams.

© 2014 Optical Society of America

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