Simultaneous measurement of real and imaginary parts of nonlinear susceptibility for the verification of the Kramers-Kronig relations in femtosecond spectroscopy

Hideaki Kano, Takayoshi Kobayashi

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Simultaneous measurement of continuous spectra of real and imaginary parts of complex nonlinear optical susceptibility was performed for porphyrin J-aggregates with sharp absorption peaks using a femtosecond Sagnac interferometer. A nonresonant component (χNR(3)) due to a solvent and a resonant component (χNR(3)) due to the porphyrin J-aggregates are observed. The real and imaginary parts are compared using the Kramers-Kronig (KK) relations, which are valid for linear optical susceptibility. It is shown that χR(3) satisfies the KK relations at all delay times. On the other hand, (χNR(3)) does not satisfy the KK relations at zero delay time. The validity of the KK relations, which have been reported in previous papers by our group, are verified for the first time experimentally using continuous spectra.

Original languageEnglish
Pages (from-to)133-139
Number of pages7
JournalOptics Communications
Volume178
Issue number1
DOIs
Publication statusPublished - May 1 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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