A self-stabilized 3.5-μm waveguide He–Xe laser

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Abstract
By building a He–Xe laser within a hollow dielectric waveguide and by using a single isotope of Xe, we have been able to attain gains of 1000 dB/m. The dispersion associated with these large gains significantly modifies the ``empty‐resonator'' mode spacing when such a medium is placed within a laser resonator. We describe experiments with a short single‐frequency waveguide He–Xe laser in which the gain medium pulls the oscillating frequencies so that the laser always oscillates within ± (1/100) (c/2L) of the center of the Xe net‐gain curve, regardless of the physical length of the laser resonator.
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