高功率法拉第隔离器多模退偏特性  

Investigation on Depolarization of High Power Faraday Isolators with Multi-Mode Incidence of Lasers

作　　者：葛廷武[1] 陆丹[1] 伍剑[1] 徐坤[1] 林金桐[1] 

机构地区：[1]北京邮电大学光通信与光波技术教育部重点实验室,北京100876

出　　处：《光子学报》2009年第10期2512-2515,共4页Acta Photonica Sinica

基　　金：自然科学基金项目(60577033);新世纪人才项目(NCET-06-0093);高等学校学科创新引智计划(B07005)资助

摘　　要：理论分析了隔离器在高功率多模激光入射时的自退偏特性.结果表明:线性双折射致退偏与圆双折射致退偏均与入射光功率的平方成正比,线性双折射致退偏与光斑大小无关,而圆双折射致退偏随光斑半径的增大而减小.当光斑半径与旋转晶体半径相比很小时(R0/r0≥80)圆双折射引起的退偏大于线性双折射引起的退偏,当光斑半径接近旋转晶体半径(R0/r0≤3)时,与线性双折射引起的退偏相比,圆双折射引起的退偏可以忽略.对比单模激光入射,在同种条件下,多模入射使得线性双折射致退偏减小了0.4倍,最小圆双折射致退偏减小为0.05倍.Self-induced depolarization in high power Faraday isolators was investigated theoretically when incidence lasers are Multi-mode.Research result shows that depolarization induced by linear birefringence and circular birefringence are also proportional to square of laser power,depolarization induced by linear birefringence has no dependence on beam radius,but depolarization induced by circular birefringence increases with reduction of beam radius.Depolarization induced by circular birefringence may be more than depdlarization induced by linear birefringence when Ro/ro ≥80,and can be neglected when R0/r0 43. In the same conditions,depolarization induced by linear hirefringencewith multi-mode incidence is 0. 6 times of that with single mode incidence, and minimum of depolarization induced by circular birefringence is only 0. 005 times of that with single mode incidence.

关 键 词：光学器件 隔离器 退偏 多模 

分 类 号：O482.55[理学—固体物理]