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Quality of wavefront reversal for four-wave interaction in a multimode waveguide with thermal nonlinearity
V.V. Ivakhnik 1, D.R. Kapizov 1, V.I. Nikonov 1

1 Samara National Research University, 443086, Russia, Samara, Moscow highway, 34

 PDF, 857 kB

DOI: 10.18287/2412-6179-CO-1011

Pages: 48-55.

Full text of article: Russian language.

Abstract:
For a four-wave radiation converter in a two-dimensional multimode waveguide with thermal nonlinearity at a low reflection coefficient, we analyze the influence of the spatial structure of pump waves on the quality of wavefront reversal. It is shown that the half-width of  modulus of the point spread function of a four-wave radiation converter decreases with decreasing radius of Gaussian pump waves on the waveguide edges, leading to an improvement in the quality of wavefront reversal. For a four-wave radiation converter in a two-dimensional waveguide with infinitely conducting surfaces, we show the presence of "generation" points, near which a sharp increase in the object wave amplitude is observed, with its form completely determined by one of the waveguide modes.

Keywords:
four-wave radiation converter, point spread function, thermal nonlinearity.

Citation:
Ivakhnik VV, Kapizov DR, Nikonov VI. Quality of wavefront reversal for four-wave interaction in a multimode waveguide with thermal nonlinearity. Computer Optics 2022; 46(1): 48-55. DOI: 10.18287/2412-6179-CO-1011.

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