摘要
研究了在连续锁模和调Ｑ锁模两种脉冲泵浦条件下，掺Ｅｒ（３＋）和掺Ｅ３＋／Ｙｂ３＋单模ＧｅＯ２／ＳｉＯ２石英光纤中，１３１３ｎｍＮｄ：ＹＬＦ激光到７８０ｎｍ波长的频率上转换过程。Ｅｒ３＋离子在共振吸收两个光子后到４Ｆ９／２态，再经快速的无辐射转移到４Ｉ９／２态．形成７８０ｎｍ辐射。在连续锁模泵浦条件下．１３１３ｎｍ至７８０ｎｍ的转换效率比调Ｑ锁模条件下更高．而后者的峰值功率是前者的几百倍。
We observed the frequency upconversion of a 1. 313 um Nd: YLF laser pulseinto 780 um through the amplified spontaneous emission (ASE) in Er3+-doped and Er3+/Yb3+-doped germanosilcate single-mode optical fibers pumped by a CW mode-locked (CW+ML) laser and a Q- switched mode-locked (QS+ML) laser, respectively. The emission at780 um corresponds to 4I9/2-4I15/2 transition, and its pumping mechanism is accomplishedby a first step resonant two-photon absorption to 4F9/2 state, fo]lowed by a fast nonradiativerelaxation to 4I9/2 state. The conversion efficiency of 1. 313 um light into 780 um lightpumped by the CW+ML laser is higher than pumped by the QS+ML laser with the peaklaser power being several hundred times higher.
出处
《中国激光》
EI
CAS
CSCD
北大核心
1996年第10期925-928,共4页
Chinese Journal of Lasers
基金
国家自然科学基金
国家攀登计划飞秒激光技术和超快过程研究资助
关键词
光纤
铒离子
镱离子
掺杂
frequency upconversion, amplified spontaneous emission, Er3+-doped fiber,Er3+/Yb3+-doped fiber
