Conclusion
We have developed, a two-dimensional diffractive model of a free-flow CO:N2 laser, using a detailed kinetic model of the active medium.
We have shown that the constant-gain model and the diffractive model yield practically the same calculated energy characteristics of a free-flow CO laser. Calculation of the spectral characteristics has shown that the diffractive model yield the same numbers and intensities of the rotational-vibrational transitions on the cavity axis as the model with constant gain. We have determined the errors incurred in calculations by the constant-gain model.
At an active-medium density ≳0.25 Amagat the angular divergence of the radiation is determined by the large-scale inhomogeneity of the subsonic gas flow while the radiation directivity in the far zone is manifested by a noticeable angular shift and is split.
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Translated from Preprint IAE-5724/11, Kurchatov Institute of Atomic Energy, Moscow, 1990.
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Elkin, N.N., Kochetov, I.V., Kurnosov, A.K. et al. Two-dimensional diffraction calculations for a fast-flow CO laser. J Russ Laser Res 13, 46–54 (1992). https://doi.org/10.1007/BF01140308
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DOI: https://doi.org/10.1007/BF01140308