scholarly journals THE POINT SPREAD FUNCTION OF A FOUR-WAVE CONVERTER IN A RESONANT MEDIUM WITH ALLOWANCE FOR PUMP WAVE DIVERGENCE

2017 ◽  
Vol 17 (2) ◽  
pp. 141-147
Author(s):  
A.A. Akimov ◽  
E.V. Vorobeva ◽  
V.V. Ivakhnik
Keyword(s):  
Point Spread Function ◽  
Pump Wave ◽  
Wave Intensity ◽  
Resonant Medium ◽  
Level Energy ◽  
Point Spread ◽  
Spread Function ◽  
Wave Divergence ◽  
Wave Converter

An expression for point spread function has been obtained for a four-waveconverter in resonant medium modelled by four-level energy scheme. The dependences of point spread function width from pumping wave intensity and resonantmedium parameters have been found.

scholarly journals POINT SPREAD FUNCTION OF FOUR-WAVE RADIATION CONVERTER ON THE KERR NONLINEARITY UNDER QUASIPERPENDICULAR INTERACTION

2017 ◽  
Vol 19 (3) ◽  
pp. 90-96
Author(s):  
V.V. Ivakhnik ◽  
A.V. Kaurov ◽  
V.I. Nikonov
Keyword(s):  
Point Spread Function ◽  
Pump Wave ◽  
Kerr Nonlinearity ◽  
Wave Radiation ◽  
Signal Wave ◽  
Wave Propagation Direction ◽  
Point Spread ◽  
Spread Function ◽  
Radiation Conversion ◽  
Wave Converter

Accuracy of conversion of radiation by degenerate four-wave-converter on the Kerr nonlinearity under quasiperpendicular interaction geometry was analyzed with the use of point spread function method. The increasing of accuracy of radiation conversion by such converter compared to the same converter with quasicollinear geometry interaction. Correlation between the half-width module of point spread function and divergence of the pump wave, position of the focusing plane of signal wave, shear wave propagation direction with respect to the pump face of the nonlinear layer were obtained.

scholarly journals TIME DEPENDENCE OF THE POINT SPREAD FUNCTION OF A FOUR-WAVE CONVERTER IN A WAVEGUIDE WITH THERMAL NONLINEARITY

2017 ◽  
Vol 20 (10) ◽  
pp. 130-139
Author(s):  
E.V. Vorobieva ◽  
V.V. Ivakhnik ◽  
M.V. Luneva
Keyword(s):  
Time Dependence ◽  
Point Spread Function ◽  
Wave Interaction ◽  
Single Mode ◽  
Initial State ◽  
Thermal Nonlinearity ◽  
Point Spread ◽  
Spread Function ◽  
Wave Converter

The time dependence of a quality of wave-front reversal has been analyzed at four-wave interaction in a waveguide with thermal nonlinearity. The influence of waveguide parameters and mode structure of pumping waves on time dependence character has been investigated. It has been shown, that increases of number of single-mode pumping waves lead to decreases of difference in point spread function width in steady state and initial state.

Point spread function based feature optimization and fusion for underwater objet recognition

2013 ◽  
Vol 26 (11) ◽  
pp. 944-952 ◽  
Author(s):  
Huibin Wang ◽  
Rong Zhang ◽  
Zhe Chen ◽  
Lizhong Xu ◽  
Jie Shen
Keyword(s):  
Point Spread Function ◽  
Point Spread ◽  
Spread Function ◽  
Feature Optimization

Determination of the Point Spread Function of a Computer-Generated Lens Formed by a Phase Light Modulator

2020 ◽  
Vol 128 (7) ◽  
pp. 1036-1040 ◽  
Author(s):  
N. G. Stsepuro ◽  
G. K. Krasin ◽  
M. S. Kovalev ◽  
V. N. Pestereva
Keyword(s):  
Point Spread Function ◽  
Light Modulator ◽  
Point Spread ◽  
Spread Function

Accurate point spread function (PSF) estimation for coded aperture cameras

2014 ◽  
Author(s):  
Jingyu Yang ◽  
Bin Jiang ◽  
Jinlong Ma ◽  
Yi Sun ◽  
Ming Di
Keyword(s):  
Point Spread Function ◽  
Coded Aperture ◽  
Point Spread ◽  
Spread Function ◽  
Psf Estimation

Aberration retrieval from the intensity point-spread function in the focal region using the extended Nijboer–Zernike approach

2005 ◽  
Vol 52 (12) ◽  
pp. 1695-1728 ◽  
Author(s):  
C. Van der Avoort * ◽  
J. J. M. Braat ◽  
P. Dirksen ◽  
A. J. E. M. Janssen
Keyword(s):  
Point Spread Function ◽  
Focal Region ◽  
Point Spread ◽  
Spread Function
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