Femtosecond continuum spectroscopy and Kramers-Kronig relations

Eric W. Van Stryland, Raluca Negres, Edward Miesak, David Hagan, Sean Ross, Arthur Dogariu

Research output: Contribution to journalConference articlepeer-review


A nonlinear spectrophotometer that can measure nondegenerate spectra from ≅1.7 μm in the infrared (IR) to ≅200 nm in the UV is developed. Dual diode arrays for the IR and visible are used to measure the spectral changes in the transmittance against a reference beam. The measured nonlinear spectra are subsequently merged and the Kramers-Kronig integral is performed. The Kramers-Kronig method gives a reliable nonlinear refraction dispersion from the nonlinear absorption spectrum. This separates ultrafast nonlinear absorption from cumulative effects such as excited state absorption. The resulting excited state refractive spectra agree with independent measurements performed using Z-scans with a picosecond optical parametric oscillator.

Original languageEnglish (US)
Pages (from-to)197-198
Number of pages2
JournalConference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS
StatePublished - 1998
Externally publishedYes
EventProceedings of the 1998 11th Annual Meeting IEEE Lasers and Electro-Optics Society, LEOS. Part 2 (of 2) - Orlando, FL, USA
Duration: Dec 1 1998Dec 4 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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