O. Faucher et al., LASER CONTROL OF 3RD-HARMONIC GENERATION BY MEANS OF AN ADDITIONAL EMFIELD, Optical and quantum electronics, 28(3), 1996, pp. 291-298
Control of the third-harmonic generation process through an external e
lectromagnetic field is observed in atomic Ca. The conversion efficien
cy can be modified when the third harmonic is produced in the vicinity
of an autoionizing state. A second laser is used to produce strong ra
diative coupling between a low-lying bound state and the autoionizing
state.