温度对小振幅双光子光折变屏蔽孤子的影响

Temperature effect to the photorefractive screening solitons under case of low amplitude

研究了温度变化对双光子光折变晶体中屏蔽孤子稳定性和演化特性的影响。其结果表明,当双光子光折变晶体的温度发生变化时,由于光折变效应与衍射效应抵消后导致的在光折变晶体中稳定传输的屏蔽光折变孤子光束的强度轮廓随之变化;晶体中在一定温度下形成的稳定孤子,当温度在一个较小的范围内变化时,孤子能够克服较小的微扰而保持其稳定性;而当晶体温度发生比较大的变化而超出了孤子稳定温度范围时,孤子将变得不稳定甚至瓦解;改变温度而使晶体中不稳定的孤子变成稳定孤子。

Temperature effects on the evolution of the screening spatial solitons in two-photon photorefractive crystals were studied.The result shows that the intensity profile of the screening spatial solitons that formed in the two-photon photorefractive crystals provided the diffraction of the beam is exactly balanced by the photorefractive effect changes when the temperature of photorefractive crystals is changed.When the temperature of crystals is changed in a less range,the stability of solitons formed in definite temperature can be persisted by overcoming the less perturbation.Solitons will become unstable or collapse when temperature of photorefractive crystals is changed in a large range.Changing the temperature of the crystal can also make the solitons from the unstable state to the stable state.