A Relation between the absorption coefficient and the transmittance spectrum

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Calculating the absorption coefficient of a thin film requires knowledge of the film's thickness, as the absorption is a product of the coefficient and thickness. Without this information, it is challenging to derive the absorption coefficient accurately from the absorption and transmittance spectrum. The discussion emphasizes that the relationship between these parameters complicates the calculation when thickness is unknown. Therefore, additional methods or assumptions may be needed to estimate the absorption coefficient. Accurate results depend on having complete data, including film thickness.
sounouhid
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hi every one
can you tell me how to calculate the absorption coefficient of a thin film using the absorption and the transmittance spectrum plotted as a function of the wavelength (knowing that i don't know the thickness of the film )
 
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Since you don't know the thickness your question can't be answered. To first order the absorption is a product of the coefficient and the thickness.
 
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thank you i really appreciate your help
 

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