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Proceedings Paper

Mechanisms of enhanced two-photon absorption in porphyrins
Author(s): Mikhail A. Drobizhev; Aliaksandr Karotki; Mikalai Kruk; Aleksander Rebane; Eric Nickel; Charles W. Spangler; Nugzar Mamardashvili
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Paper Abstract

We study absolute cross section of simultaneous two-photon absorption (TPA) in a series of porphyrins and tetraazaporphyrins by 100-fs-duration pulses in two ranges of laser wavelength, from 1100 to 1500 nm and from 700 to 800 nm. The cross section in Q transition region is, sigma(2) ~ 1-10 GM, and is explained by partial lifting of the parity prohibition rule. In Soret transition region we find enhancement by about an order of magnitude due to Q transition, which acts as a near-resonance intermediate state, and also due to gerade energy levels, which we identify in this spectral region. Further enhancement (up to sigma(2) ~ 1600 GM) is achieved by symmetrical substitution in tetraazaporphyrins with strong electron acceptor groups.

Paper Details

Date Published: 14 February 2003
PDF: 11 pages
Proc. SPIE 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications, (14 February 2003); doi: 10.1117/12.453258
Show Author Affiliations
Mikhail A. Drobizhev, Montana State Univ. (United States)
Aliaksandr Karotki, Montana State Univ. (United States)
Mikalai Kruk, Institute of Molecular and Atomic Physics (Belarus)
Aleksander Rebane, Montana State Univ. (United States)
Eric Nickel, Synar Technologies, Inc. (United States)
Charles W. Spangler, Montana State Univ. (United States)
Nugzar Mamardashvili, Ivanovo State Univ. of Chemical Technology (Russia)

Published in SPIE Proceedings Vol. 4797:
Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications
A. Todd Yeates; Christopher M. Lawson; Kevin D. Belfield; Stephen J. Caracci; Francois Kajzar; A. Todd Yeates; Kevin D. Belfield; Stephen J. Caracci, Editor(s)

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