Abstract
The role of the electric field to pressure ratio (E/p) in waveguide CO2 TE lasers is shown to be different from that in conventional CO2 TE lasers. For waveguide CO2 TE lasers, the optimum E/p in the positive column is greater than that which produces the most efficient excitation of CO2 vibrational levels, because of the necessity to reduce the detrimental effects of the power dissipated in the cathode fall region of the discharge. Experimental results on small-signal gain versus input energy as a function of E/p are shown to be in agreement with theory. Implications for device design are discussed.
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