title: Correlated third-harmonic generation in I(2) using photon-echo process.
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 I(2) 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.
authors.forename: C
authors.initials: C
authors.lastname: Tai
authors.forename: H J
authors.initials: HJ
authors.lastname: Simon