Wavelength dependence of nonlinear absorption in a bis-phthalocyanine studied using the Z-scan technique

The wavelength dependence of the nonlinear absorption of a bis-phthalocyanine, Nd(Pc)2, dissolved in dimethyl formamide was studied in the rising part of the Q-band using the open aperture Z-scan technique, to determine the wavelength region over which the nonlinear absorption changes from reverse s...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2002-12, Vol.75 (8), p.871-874
Main Authors: UNNIKRISHNAN, K. P, THOMAS, J, NAMPOORI, V. P. N, VALLABHAN, C. P. G
Format: Article
Language:English
Subjects:
Apertures
Dimethyl formamide
Dissolution
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Lasers
Mathematical analysis
Nonlinear optics
Nonlinearity
Optical limiters
Optical susceptibility, hyperpolarizability
Optics
Physics
Wavelengths
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Summary:The wavelength dependence of the nonlinear absorption of a bis-phthalocyanine, Nd(Pc)2, dissolved in dimethyl formamide was studied in the rising part of the Q-band using the open aperture Z-scan technique, to determine the wavelength region over which the nonlinear absorption changes from reverse saturable absorption to saturable absorption. It was found that the sample could be used as a reverse saturable absorber, and hence as an optical limiter, up to a wavelength of about 604 nm. The imaginary part of the third order susceptibility was also calculated for these wavelengths. Resonant enhancement of the imaginary part of the third order susceptibility was clearly observed.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-002-1058-6