Abstract

We report the application of third-harmonic generation(THG) to study photon-echo-associated coherent molecular states. Two temporally separated circularly polarized laser pulses are focused into a cell containing I₂ vapor to create the coherent dipole moments. A delayed oppositely circularly polarized pulse is then focused into the same region to generate the third harmonic. Since no THG can be produced by any individual pulse, correlated THG may easily be measured without using any fast detection scheme.

© 1981 Optical Society of America

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