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Proceedings Paper

Nonlinear spectrometry of chromophores for optical limiting
Author(s): David J. Hagan; Edward J. Miesak; Raluca A. Negres; Sean Ross; Jin Hong Lim; Eric W. Van Stryland; Arthur Dogariu
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Paper Abstract

We describe two methods for the spectral measurement of nonlinear absorption and refraction in reverse-saturable absorber materials. In the first, we use a picosecond optical parametric oscillator to perform Z-scan at many different wavelengths to measure excited state refraction and absorption cross sections throughout the visible. The second methods uses a chirped-pulse amplification scheme to produce 100 fs pulses at 840 nm. Focusing these into sapphire generates a white light continuum that is used as a probe in an excite-probe experiment. The excitation beam is derived from the second harmonic of the remaining 840 nm light. By measurement of the transmission spectrum of the probe as a function of excite- probe delay time, we can determine the spectral dependence of the excited-state absorption cross section. Moreover, by use of Kramers-Kronig relations, the excited state refraction can also be extracted from this data. We describe our measurements using both methods in a Zn:tetrabenzporphyrine derivative (TBP). The fact that both methods give excellent agreement not only verifies the utility of continuum measurements, but also reveals some interesting properties of the excited states of TBP.

Paper Details

Date Published: 12 October 1998
PDF: 11 pages
Proc. SPIE 3472, Nonlinear Optical Liquids for Power Limiting and Imaging, (12 October 1998); doi: 10.1117/12.326875
Show Author Affiliations
David J. Hagan, CREOL/Univ. of Central Florida (United States)
Edward J. Miesak, CREOL/Univ. of Central Florida (United States)
Raluca A. Negres, CREOL/Univ. of Central Florida (United States)
Sean Ross, CREOL/Univ. of Central Florida (United States)
Jin Hong Lim, CREOL/Univ. of Central Florida (United States)
Eric W. Van Stryland, CREOL/Univ. of Central Florida (United States)
Arthur Dogariu, Univ. of California/Santa Barbara (United States)

Published in SPIE Proceedings Vol. 3472:
Nonlinear Optical Liquids for Power Limiting and Imaging
Christopher M. Lawson, Editor(s)

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