Absorption of CO2 laser emission by freon-12

摘要

The infrared (IR) absorption of freon-12 (CF2Cl2) was studied in the emission range of a 3-W tunable CW CO2 laser by using a brass cell with KBr windows that was located outside the laser resonator. The results show that CF2Cl2 absorbs all CO2 laser emission lines in the ranges of 1073-1083 cm(-1) and 937-943 cm(-1). The most strongly absorbed laser line was 10P (28) ( 937.21 cm(-1)). Absorption coefficient values were obtained for all available wavelengths of the CO2 laser as the CF2Cl2 pressure was varied from 5 to 1000 mbar. By using the HITRAN database for freon-12, the absorption coefficients were calculated at the 10P (28) and 9R (28) lines as functions of the gas pressure and compared with the experimental values. The calculated results are in reasonable agreement with the experiment. [References: 13]