The Temperature Effect Of Photovoltaic Space Optical Solitons In Photorefractive Polymer

Photorefractive spatial soliton is becoming a important subject in the field of the nonlinear optics in the recent two decades. Due to the form of this specific soliton only need a very small amount of light intensity, even by several μW. This is the reason that photorefractive spatial soliton gets a wider range of use. In recent years, many essays or experiment reports on soliton formed in photorefractive crystals have come out. The theory of photorefractive spatial soliton in photorefractive crystals is improving to nearly perfect, and its potential usage in many fields has attracted many people’s attention. Due to some shortcomings of the photorefractive crystals, photorefractive polymers which is easy to produce and cheap on materials, has taken more and more attention. Moerner et al have established the orientation-enhanced model, which is the theoretical foundation of the spatial soliton in photorefractive polymers.Based on existing theories, the temperature effects on bright and dark soliton’s in open circuit condition have been discussed, Also how soliton’s form change in different temperature and background intensity is discussed, through numerical simulations, the results show that when in lower temperature and higher background intensity, the soliton’s FWHM becomes wider. The coupling of two mutually incoherent optical beams with the same polarization and wavelength in photorefractive polymers media is investigated, including dark-dark, bright-bright, bright-dark soliton pairs. These soliton pairs’ form change among different temperature and background intensity is investigated. Through numerical simulations, the results show that, with lower temperature and higher background intensity, the soliton pairs’ FWHM becomes wider and their maximum amplitudes become higher At last, how temperature effects the interactions between two same-phase bright solitons or anti-phase bright solitons are investigated by using the FD-BPM(Finite-Difference Beam Propagation Method), the results show that with higher temperature, solitons’ interaction becomes more and more obvious.