Ultrafast measurement of two-photon absorption by loss modulation

Journal Article (Journal Article)

We demonstrate a direct and sensitive technique for measuring two-photon absorption (TPA). An intensity-modulated femtosecond laser beam passes through a sample exhibiting TPA. A TPA signal at twice the modulation frequency is then generated and subsequently measured by a lock-in amplifier. The absolute TPA cross section of Rhodamine 6G at 800 nm is found to be (15.3 ± 2.0) × 10-50 cm4 s/photon and agrees well with previously published results obtained with much higher intensity [J. Chem. Phys. 112, 9201 (2000)]. Our method may be especially useful in measuring nonlinear absorptions of nonfluorescent materials. © 2002 Optical Society of America.

Full Text

Duke Authors

Cited Authors

  • Tian, P; Warren, WS

Published Date

  • September 15, 2002

Published In

Volume / Issue

  • 27 / 18

Start / End Page

  • 1634 - 1636

International Standard Serial Number (ISSN)

  • 0146-9592

Digital Object Identifier (DOI)

  • 10.1364/OL.27.001634

Citation Source

  • Scopus