Abstract
The possibility of wave-front reversal of continuous multifrequency emission with a wide line spectrum (in particular, emission of lasers operating on cascade vibrational-rotational transitions of diatomic molecules, e.g., HF or CO) is analyzed; the reversal is based on Bragg scattering from a spatial phase hologram that is recorded in a resonance-absorbing medium by emission with a frequency different from any of the reversed-signal frequencies. The mechanism of formation of a spatial phase hologram and the features of optical Bragg scattering on such structures are analyzed. It is shown that a scattered wave-front is complex conjugate to one of the waves recording the phase grating. An optical system for wave-front reversal is proposed and the Bragg scattering efficiency is estimated for a particular example. The analysis indicates that the proposed system does not exhibit frequency selectivity and is basically suitable for wave-front reversal of emission with a broad line spectrum. The main problem is to choose a medium with resonance absorption at the center of a multifrequency emission spectrum and with complete transparency for the reversed signal.
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Translated from a manuscript of the P.N. Lebedev Physical Institute submitted September 22, 1995.
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Shcheglov, V.A., Stepanov, A.A. & Troshchenkov, S.V. Wave-front reversal of multifrequency continuous emission by Bragg scattering from phase regular inhomogeneities. J Russ Laser Res 17, 31–54 (1996). https://doi.org/10.1007/BF02066647
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DOI: https://doi.org/10.1007/BF02066647