Large Optical Nonlinearity Due to Exciton State in PbI2

Teruya Ishihara, Takenari Goto

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11 Citations (Scopus)

Abstract

Optical nonlinearity is studied in a PbI2 evaporated film under the pump and probe configuration using two tunable nanosecond pulsed lasers. A change of the transmitted probe intensity is observed when the pump frequency is equal to the probe one and is in the exciton region. This Rayleigh-type nonlinearity is neither due to hole burning effect nor thermal grating effect, but due to excitonic population oscillation. The maximum nonlinear absorption amounts to —2 × 105 cm/MW which corresponds to a third-order nonlinear susceptibility of —10–4 esu. Such a large nonlinearity can be explained if the nonlinear interaction takes place over many unit cells, which comes from coherent expanse of an exciton in the crystal.

Original languageEnglish
Pages (from-to)2191-2200
Number of pages10
Journaljournal of the physical society of japan
Volume57
Issue number6
DOIs
Publication statusPublished - 1988

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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