Title:	Studies of third-order optical nonlinearity and nonlinear absorption in tetra tolyl porphyrins using degenerate four wave mixing and Z-scan
Authors:	Rao, S.V. Naga Srinivas, N.K.M Rao, D.N. Giribabu, L. Philip, Reji Maiya, B.G. Kumar, G.R.
Issue Date:	2000
Publisher:	Elsevier
Citation:	Optics Communications, 2000, Vol.182, p255-264
Abstract:	We present our experimental results on the measurement of third-order optical nonlinearity in the ns and ps domain, in several Tetra Tolyl Porphyrin molecules (TTP), using degenerate four wave mixing (DFWM) and Z-Scan techniques. Our results indicate a very high value of nonlinearity for these molecules in the ns domain and reasonably high values in the ps domain. They are found to exhibit a strong nonlinear absorption at both 532 nm and 600 nm. The high value of nonlinearity for ns pulses is attributed to higher excited singlet and triplet states. Time-resolved studies indicate an ultra-fast temporal evolution of the nonlinearity in these molecules.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/4723
ISSN:	0030-4018
Alternative Location:	http://dx.doi.org/10.1016/S0030-4018(00)00808-7 http://adsabs.harvard.edu/abs/2000OptCo.182..255R
Copyright:	2000 Elsevier
Appears in Collections:	Research Papers (LAMP)

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