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Spatial and time characteristics of a four-wave radiation converter in a parabolic waveguide with resonant nonlinearity
E.V. Vorobeva 1, V.V. Ivakhnik 1, D.R. Kapizov 1

1 Samara National Research University, 443086, Samara, Russia, Moskovskoye Shosse 34

 PDF, 804 kB

DOI: 10.18287/2412-6179-CO-1199

Pages: 27-35.

Full text of article: Russian language.

Abstract:
Spatial and temporal characteristics of a degenerate four-wave converter in a multimode waveguide with resonant nonlinearity in a scheme with counter-pumping waves are analyzed using the time response function and the point spread function. For single-mode pump waves with equal mode numbers, the dependences of the time response width on the waveguide length, the intensity of the first pump waves, and the mode number in the mode expansion of the object wave amplitude are obtained for the four-wave converter. The greatest contribution to the object wave amplitude is shown to be from the waveguide mode whose number coincides with the mode number of single-mode pump waves. For the stationary model, taking into account the spatial structure of the Gaussian pump wave leads to a monotonous decrease with a decrease in the pump beam width, followed by a constant value of the PSF module width. With single-mode pump waves with equal mode numbers, An increase in the mode number of the pump waves leads to a redistribution of energy concentrated in the side maxima of the point signal image and improvement in the quality of the wavefront reversal for a model with single-mode pump waves with equal mode numbers.

Keywords:
four-wave converter of radiation, parabolic waveguide, resonant nonlinearity, point spread function, time response.

Citation:
Vorobeva EV, Ivakhnik VV, Kapizov DR. Spatial and time characteristics of a four-wave radiation converter in a parabolic waveguide with resonant nonlinearity. Computer Optics 2023; 47(1): 27-35. DOI: 10.18287/2412-6179-CO-1199.

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