I used LAMBDA 1050+ UV/Vis/NIR Spectrophotometer (wavelength measurement range-175 to 3300 nm) to find their optical absorbance for fiber laser processing (wavelength-1064 nm). But when I use FTIR (ATR-Attenuated Total Reflection mode) to find optical absorbance for CO2 laser processing (wavelength-10.6 microns), I could not find the absorbance as in UV/Vis/NiR spectrophotometer.
Need suggestions to find the optical absorbance of metal sheet at 10.6 microns wavelength.
Whether diffuse reflectance mode in FTIR works in this case?
Any other techniques?
Metals are highly reflecting around 10.6 microns and transmittance should accordingly be close to zero already for a layer thickness of 50 nm, since the real part of the dielectric function of a metal is negative in this spectral range. So not much of the light should be absorbed, if the metal sheets are shiny.
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