Abstract
Under the electric dipole approximation, second-harmonic generation (SHG) in an isotropic medium is strictly forbidden by inversion symmetry. However, using intense laser pulses, a number of physical mechanisms can break the inversion symmetry and lead to SHG.1 SHG was subsequently observed in a metal vapor and a static gas by using dye and Nd:YAG lasers.2–4 The mechanism of SHG in the above experiments has been explained as charge separation process. Recently, plasma-induced SHG in a helium cell with a Nd:YAG laser also has been re- ported.5
© 1992 Optical Society of America
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