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- W2796385482 abstract "Single Beam Transmittance (SBT) was used as nonlinear spectroscopic tool to investigate the absorption cross-sections and lifetimes of Tetra Phenyl porphyrin (H2TPP) and its OH- group derivative (H2TPP(OH)4) doped in boric acid glass (BAG). We have used 671 nm wavelength as exciting wavelength for both CW (incident intensity up to 1010 W/cm2) and femto-second laser pulse (up to fluence of 102 mJ/cm2). Under cw laser excitation, H2TPP doped BAG demonstrates Double Saturable Absorber (DSA) behavior whereas H2TPP(OH)4 doped BAG act as Revere Saturable Absorber (RSA). Rate equation model espouses to extract the spectroscopic parameters from the experimental data. Excited state life times and absorption cross-sections were obtained as parameters for theoretical fit on SBT data. Porphyrin molecules act as four level systems under cw laser excitation, whereas in the presence of femto-second laser excitation they act as a two level system. We have derived the equations for transmitted energy through the material in the presence of femto-second laser illumination. Both systems viz., H2TPP and H2TPP(OH)4 doped BAG behaves as saturable absorbers when excited by femto-second laser pulses." @default.
- W2796385482 created "2018-04-13" @default.
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- W2796385482 date "2018-04-01" @default.
- W2796385482 modified "2023-10-14" @default.
- W2796385482 title "Nonlinear Spectroscopic Study of Porphyrin Under cw and Femto-second Laser Pulse Excitation" @default.
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- W2796385482 doi "https://doi.org/10.48550/arxiv.1804.00288" @default.
- W2796385482 hasPublicationYear "2018" @default.
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