Theory and experiments on multiwave-mixing-mediated probe-beam amplification

Iam-choon Khoo, T. H. Liu

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


In a highly nonlinear thin film, the presence of the diffracted beams from the pump-probe-beam-induced refractive-index grating modifies considerably the energy coupling between the pump and the probe beams. Using coupled amplitude and phase equations, the roles of various factors such as phases and phase shifts, phase modulations, pump-beam intensity, intensity ratio, interaction length, and losses in the medium in the multiwave-mixing processes are clearly identified. We also present experimental results on the dependence of the probe gain on the pump-probe-beam ratio, the pump intensity, and on the interaction length, using a nematic liquid-crystal film as the nonlinear medium.

Original languageEnglish (US)
Pages (from-to)4036-4044
Number of pages9
JournalPhysical Review A
Issue number8
StatePublished - Jan 1 1989

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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