I find discussion about absorption cofficiont of glass by he=ne laeser?

Question

I find discussion about absorption cofficiont of glass by he=ne laeser?

Answer 1

Below is a typical transmission curve of BK7 borosilicate glass.    That lists the transmissivity of a 1-cm thick plate of glass (the optical crown glass curve).  The curve is essentially flat through the visible so you can figure the transmissivity is 90% at the fundamental wavelength of a He-Ne laser (632 nm).  

Given that

log(0.90) = absorption coefficient * pathlength

you can calculate the absorption coefficient from the transmissivity.