求翻译：总之，单光子吸收系数 在弱光下为 ，强光下吸收系数与光强的关系可用式(6.16)表达；双光子吸收的吸收系数与光强成正比，比例系数为双光子吸收系数。但是，因为 数值很小，一般弱光情况下双光子吸收比单光子吸收微弱得多。只有在光强很强时双光子吸收的效应才表现出来。是什么意思？

In short, single-photon absorption coefficient under low light, the strong relationship between light intensity and optical absorption coefficient under free (6.16) expression; and absorption coefficient of two-photon absorption is proportional to the light intensity, scaling factors for the two-pho

In short, single photon absorption coefficient in the LOW light, bright light absorption coefficient and the intensity of the relationship between available (6.16 ) expression; double-photon absorption coefficient of absorption is proportional to the intensity and scale factor for dual photon absorp

In brief, the single photon absorption coefficient under the weak light is, under glare absorption coefficient and luminous intensity relational available -like (6.16) expression; The double photon absorption absorption coefficient and the luminous intensity are proportional, scale-up factor for dou

In short, single-photon absorption coefficient under low light, the strong relationship between light intensity and optical absorption coefficient under free (6.16) expression; and absorption coefficient of two-photon absorption is proportional to the light intensity, scaling factors for the two-pho

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