加偏压光伏光折变晶体中空间灰孤子的时间特性  

Temporal Behavior of Grey Spatial Solitons in an Biased Photovoltaic Photorefractive Media

作　　者：吉选芒[1] 姜其畅[1] 王金来[1] 刘劲松[2] 

机构地区：[1]山西运城学院物理与电子工程系,山西运城044000 [2]华中科技大学光电子科学与工程学院,武汉430074

出　　处：《光电子技术》2011年第1期28-31,共4页Optoelectronic Technology

摘　　要：基于加偏压的光伏光折变介质中的时间特性的带输运模型,对屏蔽光伏空间灰孤子进行了理论研究。通过对这些时间特性的比较,结果显示能获得准稳态和稳态屏蔽光伏空间灰孤子。研究表明:当孤子的峰值强度与暗辐射的比值较大时,孤子的半峰宽度先是随时间增加递减到一个最小值,然后又开始增加到一个稳定的常数值。在相同的演化时间内,孤子的半峰全宽随着孤子灰度的增大而增大。在外加电场不存在的情况下,可以得到闭路光伏灰孤子的时间特性;当外加电场足够强可忽略光伏效应时,可得到屏蔽灰孤子的时间特性。Based on the time-dependent band-transport model in a biased photovoltaic photorefractive medium,grey screening-photovoltaic spatial solitons is theoretically investigated.Comparing these time-independent models,theoretical results reveal that quasi-steady and steady-seate gray screening-photovoltaic can be obtained.The results indicate that when the ratio between the soliton peak intensity and dark irradiance is larger,the FWHM of solitons first decrease to a minimum then increases to a constant value.The FWHM of soliton increases as soliton grey scale parameters increase.Temporal behavior of screening soliton is obtained under the closed circuit condition in the absence of photovoltaic effect,whereas temporal behavior of grey screening-photovoltaic spatial solitons is obtained when the applied bias field is too strong to be neglected.

关 键 词：非线性光学 光折变效应 屏蔽光伏空间灰孤子 时间特性 

分 类 号：O437[机械工程—光学工程]