The optical absorption coefficient of amorphous polyethylene in the region 450–725 nm

The optical absorption coefficient of amorphous polyethylene sheets was measured in the wavelength range 450–725 nm using a monomode ring dye laser. The incident laser power was 100 mW and the single sheet thickness used was 0·039 mm. The measured value of the absorption coefficient was 103·85 cm−1 and is substantially constant over the wavelength range used.