The efficiency of the feedback provided by the external mirrors of the resonator for a He-Ne waveguide laser at a wavelength of 3.39 μm is investigated experimentally. The experimental data obtained are compared with the results of theoretical calculations and show good agreement. The spatial distribution of the field of the modes of oscillation generated by the laser are investigated for different parameters of the resonators and gas-discharge tubes. It is established that tuning of the laser mirrors leads to complication of the mode composition of the emission. The dependence of the gain margin on the degree of detuning of the laser mirrors is measured.
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