Optical phase conjugation studies in metal substituted tetraphenyl porphines

B. R. Prasad; Sangeneni Mohan; C. K. Subramanian; P. S. Narayanan

doi:10.1117/12.636918

16 December 1992 Optical phase conjugation studies in metal substituted tetraphenyl porphines

B. R. Prasad, Sangeneni Mohan, C. K. Subramanian, P. S. Narayanan

Proceedings Volume 1622, Emerging Optoelectronic Technologies; (1992) https://doi.org/10.1117/12.636918
Event: Emerging OE Technologies, Bangalore, India, 1991, Bangalore, India

Abstract

Optical Phase Conjugation studies have been carried out on five different metal substituted Tetraphenyl Porphines. The dependence of conjugate efficiency on perturbation of u-electron cloud of porphine ring by different substituted metals solute concentration solvent parameters intensities and quantum efficiencies have been investigated. I. Intrrxiuctiort: Tetraphenyl Porphines form the basis of many biological molecules including hae moglobin and chlorophyll. However their ability to absorb visible radiation strongly and their conjugated double bond structure allows us to keep them within the general classification of dye molecules. The structural formula of the free base tetraphenyl porphine (H2TPP) is given in fig. 1. Other porphines can be formed by substituting the two centre hydrogens with a metal. The presence of this metal perturbs the yr-electron cloud in the porphine ring and this perturlxition is dependent on the substituted metal. Porphines therefore appear to be an excellent model system in which one can investigate the effects of perturbing a u-electron system by DFWM. Porphines exhibit the phenomenon of reverse saturable absorption i. e. a decrease in transmission with increasing intensity of incident radiation. This occurs if the absorption 257 cross-section from the excited state up to a higher excited state is larger than the absorption from the ground state to the excited state. In this paper we present the details of phase conjugation studies on five metal substituted te traphenyl porphines: (1)Al TPP (2)Co TPP

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B. R. Prasad, Sangeneni Mohan, C. K. Subramanian, and P. S. Narayanan "Optical phase conjugation studies in metal substituted tetraphenyl porphines", Proc. SPIE 1622, Emerging Optoelectronic Technologies, (16 December 1992); https://doi.org/10.1117/12.636918

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KEYWORDS

Phase conjugation

Reflectivity

Metals

Absorption

Molecules

Laser beam propagation

Radio propagation

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