Hanle effect in Ti Laser-Induced Plasma Lasers

The systematic studies of Ti Laser-Induced Plasma Lasers (LIPL) are presented. Many generation lines in the blue–green spectral range are found. Ti LIPLs are generated according to the quasi-three-level (direct lasing) scheme where generation transitions occur from the pumped to the intermediate level. Most Ti LIPL generation lines are strongly linearly polarized with polarization vector E_g normal or parallel to the pumping polarization vector E_p depending on energy states involved in the generation cycle. External magnetic fields directed parallel to the generation direction strongly reduce the generation lines polarization and reduce line intensity. It is proposed that generation lines polarization at zero magnetic fields, and their depolarization in the external magnetic field may be explained by Hanle zero-field level-crossing effect, which needs to be modified for a direct generation scheme.