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Please use this identifier to cite or link to this item: http://purl.org/purl/2589

Title: Spectral dependence of third order nonlinear optical susceptibility of zinc phthalocyanine
Authors: Santhi, A
Vinu V, Namboodiri
Radhakrishnan, P
Nampoori, V P N
Technology
Keywords: nonlinear optical susceptibility
zinc compounds
organic compounds
optical saturable absorption
high-speed optical techniques
visible spectra
infrared spectra
optical switches
photoexcitation
optical materials
optical limiters
Issue Date: 2006
Publisher: American Institute of Physics
Abstract: Wavelength dependence of saturable absorption (SA) and reverse saturable absorption (RSA) of zinc phthalocyanine was studied using 10 Hz, 8 ns pulses from a tunable laser, in the wavelength range of 520–686 nm, which includes the rising edge of the Q band in the electronic absorption spectrum. The nonlinear response is wavelength dependent and switching from RSA to SA has been observed as the excitation wavelength changes from the low absorption window region to higher absorption regime near the Q band. The SA again changes back to RSA when we further move over to the infrared region. Values of the imaginary part of third order susceptibility are calculated for various wavelengths in this range. This study is important in identifying the spectral range over which the nonlinear material acts as RSA based optical limiter.
URI: http://dyuthi.cusat.ac.in/purl/2589
Appears in Collections:Dr. V P N Nampoori

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