The strong reverse saturation absorption (optical limiting) which has been observed with high-peak-power, short-pulse lasers in Pt-phthalocyanine solutions can also be observed at low intensity with continuous-wave lasers. The origin of the effect is a strong triplet state absorption as in the case of pulse excitation. We demonstrate that this phenomenon can be utilized to generate various types of all-optical switching.
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Fryad Z. Henari (2001) studied this question.
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