基于双光子异构非线性的非相干耦合孤子族  

Incoherently Coupled Soliton Family Supported by Two-Photon Isomerization Nonlinearity

作　　者：王红成[1] 彭小兰[1] 陈少文[1] 李洪涛[1] 凌东雄[1] 

机构地区：[1]东莞理工学院电子工程学院,广东东莞523808

出　　处：《光学学报》2009年第8期2264-2269,共6页Acta Optica Sinica

基　　金：东莞市科技计划项目(2007108101013)资助项目

摘　　要：理论研究了基于双光子异构非线性的非相干耦合孤子族的存在性。发现非相干耦合灰孤子族及暗孤子族可以在具有双光子异构非线性的块状聚合物中存在。若各分量成分具有相同的偏振和波长但彼此互不相干,可能形成这种孤子族。用数值方法详细地研究了这种非相干耦合灰孤子族及暗孤子族的存在条件及其特性。非相干耦合孤子族的每一个分量成分具有相同的半高全宽。当这一非相干耦合灰孤子族或暗孤子族在具有双光子光致异构非线性的聚合物中传播时,各分量成分光束都能稳定传播。研究表明,灰孤子族各分量成分具有横向运动速度,但暗孤子族不会在横向上发生移动。当这种非相干耦合孤子族只有两个分量成分时,它们自动退化成灰孤子对或暗孤子对。A theory is presented to investigate the existence of incoherent coupled soliton family supported by twophoton isomerization nonlinearity. It is found that incoherent coupled gray and dark soliton families can exist in bulk polymers with the two-photon isomerization （TPI） nonlinearity. These soliton families can be established provided that their components have the same polarization and wavelength, and are mutually incoherent. The existing conditions and properties of this kind of incoherent coupled gray and dark soliton families are investigated in detail by numerical method. Each component of an incoherent coupled soliton family has the same full width of half maximum. When this incoherent coupled gray or dark soliton family propagates together, all the components can propagate stably in the polymers with two-photon isomerization nonlinearity. The investigation shows that the components of a gray soliton family have a transverse velocity, while those of dark soliton family don＇t move in the transverse direction. If there are only two components, incoherent coupled TPI soliton families automatically degenerates to incoherent coupled TPI gray or dark soliton pairs.

关 键 词：非线性光学 光学孤子 折射率改变 双光子异构 

分 类 号：O437[机械工程—光学工程]