温度对中心对称光折变稳态暗孤子演化的影响

Effects of the Temperature on the Evolution of Steady-state Dark Solitons in Biased Centrosymmetric Photorefractive Crystals

为了得到温度对中心对称光折变晶体中空间暗孤子影响的结果,数值研究了中心对称光折变暗孤子动态演化的温度特性。结果表明,孤子强度包络演化强烈地依赖于晶体的温度和介电常数的温度特性。在290-320K的温度变化范围内,暗孤子的宽度随温度的增加而变大,孤子的峰值强度随温度的增加而变小。在300K的温度下,中心对称光折变介质中可以形成稳定的暗空间孤子,当温度从300K升高或降低时,孤子将克服较小的扰动而保持稳定的传播。通过调整温度可以改变孤子的空间形态。

In order to obtain the effects of the temperature on steady-state dark spatial solitons in biased centrosymmetric photorefractive crystals,the temperature dependence of evolution of steady-state dark spatial solitons in biased centrosymmetric photorefractive crystals are numerically intestigated.It is shown that intensity profiles of solitons strongly depend on the crystal temperature and the dielectric constant temperature dependence dominates the process.Under the range of 290-320 K,the soliton normalized peak intensity drops rapidly over a narrow range of temperature and soliton width increases as temperature rises.a stable dark spatial solitons can be formed in a crystal at a given temperature of 300K.When the temperature of crystals increases or decreases from 300 K,the stability of solitons can be persisted by overcoming the less disturbance.The spatial shape of a stable solitons can be inflected by appropriately adjusting the crystal temperature.