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- W66473106 abstract "Many optical networks are limited in speed and processing capability due to the necessity for the optical signal to be converted to an electrical signal and back again. In addition, electronically manipulated interconnects in an otherwise optical network lead to overly complicated systems. Optical spatial solitons are optical beams that propagate without spatial divergence. They are capable of phase dependent interactions, and have therefore been extensively researched as suitable all optical interconnects for over 20 years. However, they require additional external components, initially high voltage power sources were required, several years later, high power background illumination had replaced the high voltage. However, these additional components have always remained as the greatest hurdle in realising the applications of the interactions of spatial optical solitons as all optical interconnects. Recently however, self-focusing was observed in an otherwise self-defocusing photorefractive crystal. This observation raises the possibility of the formation of soliton-like fields in unbiased self-defocusing media, without the need for an applied electrical field or background illumination.This thesis will present an examination of the possibility of the formation of soliton-like low divergence fields in unbiased self-defocusing photorefractive media. The optimal incident beam and photorefractive media parameters for the formation of these fields will be presented, together with an analytical and numerical study of the effect of these parameters. In addition, preliminary examination of the interactions of two of these fields will be presented.In order to complete an analytical examination of the field propagating through the photorefractive medium, the spatial profile of the beam after propagation through the medium was determined. For a low power solution, it was found that an incident Gaussian field maintains its Gaussian profile as it propagates. This allowed the beam at all times to be described by an individual complex beam parameter, while also allowing simple analytical solutions to the appropriate wave equation.An analytical model was developed to describe the effect of the photorefractive medium on the Gaussian beam. Using this model, expressions for the required intensity dependent change in both the real and imaginary components of the refractive index were found. Numerical investigation showed that under certain conditions, a low powered Gaussian field could propagate in self-defocusing photorefractive media with divergence of approximately 0.1 % per metre.An investigation into the parameters of a Ce:BaTiO3 crystal showed that the intensity dependent absorption is wavelength dependent, and can in fact transition to intensity dependent transparency. Thus, with careful wavelength selection, the required intensity dependent change in both the real and imaginary components of the refractive index for the formation of a low divergence Gaussian field are physically realisable.A theoretical model incorporating the dependence of the change in real and imaginary components of the refractive index on propagation distance was developed. Analytical and numerical results from this model are congruent with the results from the previous model, showing low divergence fields with divergence less than 0.003 % over the propagation length of the photorefractive medium. In addition, this approach also confirmed the previously mentioned self-focusing effect of the self-defocusing media, and provided an analogy to a negative index GRIN lens with an intensity dependent focal length. Experimental results supported the findings of the numerical analysis.Two low divergence fields were found to possess the ability to interact in a Ce:BaTiO3 crystal in a soliton-like fashion. The strength of these interactions was found to be dependent on the degree of divergence of the individual beams. This research found that low-divergence fields are possible in unbiased self-defocusing photorefractive media, and that soliton-like interactions between two of these fields are possible. However, in order for these types of fields to be used in future all optical interconnects, the manipulation of these interactions, together with the ability for these fields to guide a second beam at a different wavelength, must be investigated." @default.
- W66473106 created "2016-06-24" @default.
- W66473106 creator A5026046029 @default.
- W66473106 date "2011-01-01" @default.
- W66473106 modified "2023-09-23" @default.
- W66473106 title "Propagation of low power low divergence Gaussian fields in unbiased self-defocusing photorefractive media and their interactions" @default.
- W66473106 cites W1544366372 @default.
- W66473106 cites W174673980 @default.
- W66473106 cites W1964191724 @default.
- W66473106 cites W1964767760 @default.
- W66473106 cites W1968636198 @default.
- W66473106 cites W1970078515 @default.
- W66473106 cites W1974703851 @default.
- W66473106 cites W1974977329 @default.
- W66473106 cites W1977718575 @default.
- W66473106 cites W1978639601 @default.
- W66473106 cites W1983454466 @default.
- W66473106 cites W1984638383 @default.
- W66473106 cites W1988398377 @default.
- W66473106 cites W1989687888 @default.
- W66473106 cites W1994334549 @default.
- W66473106 cites W1998406436 @default.
- W66473106 cites W1998944441 @default.
- W66473106 cites W1998967852 @default.
- W66473106 cites W1999200989 @default.
- W66473106 cites W2000164526 @default.
- W66473106 cites W2002558057 @default.
- W66473106 cites W2006886274 @default.
- W66473106 cites W2009076483 @default.
- W66473106 cites W2009432157 @default.
- W66473106 cites W2010635098 @default.
- W66473106 cites W2011874661 @default.
- W66473106 cites W2015199979 @default.
- W66473106 cites W2016620405 @default.
- W66473106 cites W2017130512 @default.
- W66473106 cites W2019843703 @default.
- W66473106 cites W2021363277 @default.
- W66473106 cites W2023555326 @default.
- W66473106 cites W2024963226 @default.
- W66473106 cites W2025029368 @default.
- W66473106 cites W2027353571 @default.
- W66473106 cites W2027928819 @default.
- W66473106 cites W2029327441 @default.
- W66473106 cites W2030200346 @default.
- W66473106 cites W2030420037 @default.
- W66473106 cites W2032803342 @default.
- W66473106 cites W2038733398 @default.
- W66473106 cites W2039328521 @default.
- W66473106 cites W2042124651 @default.
- W66473106 cites W2043519279 @default.
- W66473106 cites W2045103640 @default.
- W66473106 cites W2045380552 @default.
- W66473106 cites W2049332242 @default.
- W66473106 cites W2050173116 @default.
- W66473106 cites W2052757844 @default.
- W66473106 cites W2053651305 @default.
- W66473106 cites W2055190075 @default.
- W66473106 cites W2055790946 @default.
- W66473106 cites W2059141398 @default.
- W66473106 cites W2059306149 @default.
- W66473106 cites W2059461249 @default.
- W66473106 cites W2062096359 @default.
- W66473106 cites W2064779245 @default.
- W66473106 cites W2067424959 @default.
- W66473106 cites W2071632835 @default.
- W66473106 cites W2073401011 @default.
- W66473106 cites W2075823796 @default.
- W66473106 cites W2077685547 @default.
- W66473106 cites W2077726880 @default.
- W66473106 cites W2078662502 @default.
- W66473106 cites W2079510288 @default.
- W66473106 cites W2079769601 @default.
- W66473106 cites W2084453844 @default.
- W66473106 cites W2084986493 @default.
- W66473106 cites W2086130452 @default.
- W66473106 cites W2086987617 @default.
- W66473106 cites W2087249997 @default.
- W66473106 cites W2088563394 @default.
- W66473106 cites W2089573864 @default.
- W66473106 cites W2090243080 @default.
- W66473106 cites W2090811692 @default.
- W66473106 cites W2093120636 @default.
- W66473106 cites W2094395086 @default.
- W66473106 cites W2095669631 @default.
- W66473106 cites W2104526670 @default.
- W66473106 cites W2110868468 @default.
- W66473106 cites W2114481692 @default.
- W66473106 cites W2119042068 @default.
- W66473106 cites W2119713370 @default.
- W66473106 cites W2123958587 @default.
- W66473106 cites W2126288546 @default.
- W66473106 cites W2128201718 @default.
- W66473106 cites W2133116785 @default.
- W66473106 cites W2138172432 @default.
- W66473106 cites W2145102022 @default.
- W66473106 cites W2147267336 @default.
- W66473106 cites W2148093830 @default.
- W66473106 cites W2148987260 @default.
- W66473106 cites W2152122662 @default.
- W66473106 cites W2152608377 @default.