Gas Mixtures and Pressures for Optimum Output Power of rf-Excited Helium–Neon Gas Lasers at 6328 nm

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Abstract
Two laser discharge tubes, of 50-cm length and 3-mm and 5-mm i.d., respectively, were filled with three different mixtures of helium and neon at varying total pressures. The gas fillings for which the two tubes yielded optimal lasing action under rf excitation in a 60-cm confocal cavity at 632.8 nm were a 7:1 gas mixture at 2.3 torr for the 3-mm tube, and a 9:1 mixture at 2.0 torr for the 5-mm tube. The 3-mm tube was found to be superior in peak output power and ease of adjustment of the laser.

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