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Proceedings Paper

Two-dimensional Z-scan method for the measurement of optical nonlinear effects
Author(s): Peilin Chen; Ivan V. Tomov; Peter M. Rentzepis; Masato Nakashima; Joseph F. Roach
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Paper Abstract

Recently some phthalocynine derivatives have been reported to exhibit a strong optical limiting effect which is due to their large reverse saturable absorption. In this report we present another close family of phthalocynine, meso-substituted tetrabenzoporphyrins. We have employed both modified Z-scan techniques which uses a CCD camera as the detector and picosecond transient spectroscopy to study the optical power limiting mechanism of the meso-substituted tetrabenzoporphyrin derivatives. With the aid of a CCD detector, a two dimensional image of the beam, in the far field can be obtained directly in the Z-scan experiments. By integrating different parts of the image, both "closed aperture" and "open aperture" information can be calculated at the same time. In the kinetics measurements, several characteristic (ir,ir*), (,*) and (d, d) transitions have been observed, and the absorption cross sections and the relaxation rates of each transient has been measured.

Paper Details

Date Published: 10 October 1997
PDF: 10 pages
Proc. SPIE 3146, Nonlinear Optical Liquids and Power Limiters, (10 October 1997); doi: 10.1117/12.279302
Show Author Affiliations
Peilin Chen, Univ. of California/Irvine (United States)
Ivan V. Tomov, Univ. of California/Irvine (United States)
Peter M. Rentzepis, Univ. of California/Irvine (United States)
Masato Nakashima, U.S. Army Natick Research, Development, & Engineering Ctr. (United States)
Joseph F. Roach, U.S. Army Natick Research, Development, & Engineering Ctr. (United States)

Published in SPIE Proceedings Vol. 3146:
Nonlinear Optical Liquids and Power Limiters
Christopher M. Lawson, Editor(s)

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