Abstract
A new method to stabilize the CO2 concentration in sealed-off CO2 lasers is presented. Molecular sieves (zeolites) are used to adsorb large amounts of CO2, allowing compensation of losses of CO2 arising mainly from oxidation processes, other chemical reactions and O2 adsorption. The adsorption process of CO2 and water vapour in zeolites is theoretically described using Langmuir's isothermic equation. The theory allows a determination of the optimum quantity of zeolite and gives a temperature dependence of the adsorptive capacity. A RF-pumped CO2 waveguide laser is used to test the CO2 pressure stabilization. The measurements were performed by means of a quadrupole mass spectrometer.
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