It is found that both effects of saturable absorption and reverse saturable absorption are obtained with a solution of subphthalocyanine 2 at 532 nm depending on the intensity of 9 ns laser pulses; saturable absorption occurs at lower intensity levels whereas the reverse effect prevails at higher levels; contrary to expectations, subphthalocyanines can behave as reverse saturable absorbers at 532 nm, despite the high linear absorption at this wavelength; data have been fitted with a five-level model which considers three consecutive electronic transitions with absorption cross-section values of 1.4 × 10−16, 1.0 × 10−16 and 40 × 10−16 cm2, respectively.
研究发现,亚
酞菁 2 的溶液在 532 nm 波长处具有可饱和吸收和反向可饱和吸收两种效应,这取决于 9 ns 激光脉冲的强度;可饱和吸收发生在较低的强度
水平,而反向效应则在较高的强度
水平上占主导地位;与预期相反,亚
酞菁在 532 nm 波长处可以表现为反向可饱和吸收,尽管在该波长处具有较高的线性吸收;数据采用五级模型进行拟合,该模型考虑了三个连续的电子跃迁,其吸收截面值分别为 1.4 × 10-16、1.0 × 10-16 和 40 × 10-16 平方厘米。