Opto-acoustic measurement of the absorption coefficients of IR window materials for a CO2 laser

A laser opto-acoustic technique has been used to measure the absorption coefficients of IR window materials (for example NaCl, KCl, AR-coated Ge, BaF2, CaF2 and ZnS) on the R(20) and the P(20) lines of a CO2 laser. In this paper the above materials under their working conditions have also been assessed.