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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 10, Iss. 13 — Jul. 1, 2002
  • pp: 566–574

New technique for degenerate two-photon absorption spectral measurements using femtosecond continuum generation

Guang S. He, Tzu-Chau Lin, Paras N. Prasad, Ramamurthi Kannan, Richard A. Vaia, and Loon-Seng Tan  »View Author Affiliations

Optics Express, Vol. 10, Issue 13, pp. 566-574 (2002)

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We present a new technique for direct measurements of degenerate two-photon absorption (TPA) spectra of two-photon absorbing materials including non-fluorescent samples. This technique is based on the use of an intense single continuum-generation beam as the coherent white-light source with specially flattened spectral distribution. The different spectral components of the continuum beam are spatially dispersed and then passed through the sample material along different pathways so that nondegenerate TPA processes among different input spectral components can be avoided. By comparing the input and transmitted continuum spectral distributions, the TPA spectrum for a given sample can be obtained. As an example, the continuous TPA spectrum (from 550 to 1000 nm) is measured for a novel two-photon-absorbing compound (AF-389) which exhibits an extremely high TPA cross-section value of ~1×10-20 cm4/GW, or ~249 GM, around ~800-nm spectral range in femtosecond regime.

© 2002 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(190.4180) Nonlinear optics : Multiphoton processes
(300.6530) Spectroscopy : Spectroscopy, ultrafast

ToC Category:
Research Papers

Original Manuscript: May 17, 2002
Revised Manuscript: June 17, 2002
Published: July 1, 2002

Guang He, Tzu-Chau Lin, Paras Prasad, Ramamurthi Kannan, Ricahrd Vaia, and Loon-Seng Tan, "New technique for degenerate two-photon absorption spectral measurements using femtosecond continuum generation," Opt. Express 10, 566-574 (2002)

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