A two dimensional Z-scan method for the measurement of optical nonlinear effects
Conference Paper
Overview
Research
Identity
Additional Document Info
Other
View All
Overview
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 (,*), (,*) and (d, d) transitions have been observed, and the absorption cross sections and the relaxation rates of each transient has been measured. 2005 Copyright SPIE - The International Society for Optical Engineering.
