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Indium porphyrin 1 is an excellent optical limiterat visible wavelengths (480–620 nm). Absorption of light results in quantitative formation of the triplet excited state, which absorbs light 48 times more strongly than the ground state and has a lifetime of 0.8 ms. This should provide strong nonlinear attenuation of laser pulses on picosecond to microsecond timescales.
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Krivokapic et al. (2001) studied this question.
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