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Il Nuovo cimento della Società italiana di fisica. B/Il Nuovo cimento B

Saturation effects in the absorption of the laser light by organic dyes

Vittorio Degiorgio, G. Potenza

Published Feb 1, 1966• 17 citations
Publisher
DOI
10.1007/bf02710392

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The nonlinear absorption of intense laser light is used to obtain information about the times required for spectral cross relaxation (${T}_{3}$) and collisional dephasing (${T}_{2}$) in organic-dye solutions. The steady-state transmission experiment of Huff and DeShazer indicates that ${T}_{2}$ is in the range 0.1-1 psec for cryptocyanine-methanol, while ${T}_{3}$ is in the range 1-10 psec. For DDI-glycerin (1, 1\ensuremath{'}-diethyl-2, 2\ensuremath{'}-dicarbocyanine-iodide-glycerin), measurements of ultrashort-pulse transmission as a function of incident energy and optical polarization suggest a value ${T}_{2}=0.4\ifmmode\pm\else\textpm\fi{}0.2$ psec for that system. These results are based on a new set of rate equations for absorption by inhomogeneously broadened organic-dye solutions. The equations display the effects of spectral cross relaxation and are not limited to light intensities less than those at which coherent interaction effects become important. For the case of ultrashort incident pulses, the equations are extended to account for excited-state absorption, the dependence of absorption on optical polarization, and the existence of a multiplicity of interacting excited states.

Physical Review A•Nov 1, 1974•25 citations

ON THE PROPERTIES OF THE SPECTRAL BLEACHING IN SATURABLE DYES

Vittorio Degiorgio

It is shown by a rate-equation analysis why hole-burning effects in the absorption line of some organic dyes have been observed only when the saturable absorber is within a laser cavity. The main assumption is that the absorption line is inhomogeneously broadened and that the cross relaxation time between homogeneous components is short compared to the spontaneous decay time, but still finite. An approximate value of the cross relaxation time is also calculated.

Applied Physics Letters•Mar 15, 1967•9 citations
The nonlinear absorption of intense laser light is used to obtain information about the times required for spectral cross relaxation (T3{T}_{3}T3​) and collisional dephasing (T2{T}_{2}T2​) in organic-dye solutions. The steady-state transmission experiment of Huff and DeShazer indicates that T2{T}_{2}T2​ is in the range 0.1-1 psec for cryptocyanine-methanol, while T3{T}_{3}T3​ is in the range 1-10 psec. For DDI-glycerin (1, 1\ensuremath{'}-diethyl-2, 2\ensuremath{'}-dicarbocyanine-iodide-glycerin), measurements of ultrashort-pulse transmission as a function of incident energy and optical polarization suggest a value ${T}_{2}=0.4\ifmmode\pm\else\textpm\fi{}0.2$ psec for that system. These results are based on a new set of rate equations for absorption by inhomogeneously broadened organic-dye solutions. The equations display the effects of spectral cross relaxation and are not limited to light intensities less than those at which coherent interaction effects become important. For the case of ultrashort incident pulses, the equations are extended to account for excited-state absorption, the dependence of absorption on optical polarization, and the existence of a multiplicity of interacting excited states.