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应用激发态吸收增强瞬态热折射理论结合激发态折射理论研究了新型锌卟啉化合物Zn-porphyrin中激发态吸收增强瞬态热折射与激发态折射间的相互竞争.样品在不同脉宽激光激发下呈现自聚焦-自散焦间的转化.当入射激光脉宽为4ns时,激发态折射占主要地位,样品呈现自聚焦性质;当入射激光脉宽为8ns时,激发态吸收增强瞬态热折射占主要地位,激发态折射占次要地位,样品呈现自散焦性质.
The excited-state absorption enhanced transient thermal refraction theory combined with the excited-state refraction theory was used to study the competition between excited-state absorption enhancement transient thermal refraction and excited-state refraction in the novel zinc-porphyrin Zn-porphyrin. When the incident laser pulse width is 4ns, the excited state refraction plays a dominant role and the sample exhibits the self-focusing property. When the incident laser pulse width is 8ns, the excited state absorption enhances the transient heat Refraction plays a dominant role, and excited state refraction plays a secondary role. The samples show self-defocusing properties.