全光纤化的被动式亚纳秒脉冲Yb光纤激光器研究  

All-Fiberized Yb Fiber Laser with Passively Generated Sub-Nanosecond Pulse Output

作　　者：刘伟[1] 陈滔[1] 戴建宁 姜培培[1,3] 吴波[1] 沈永行[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,浙江杭州310027 [2]北京特种机电技术研究所,北京100012 [3]温州医学院信息与工程学院,浙江温州325035

出　　处：《光学学报》2011年第12期166-170,共5页Acta Optica Sinica

基　　金：国家自然科学基金(61078015);温州市科技计划项目(H20100024)资助课题

摘　　要：报道了一种可以被动式产生高峰值功率亚纳秒脉冲的全光纤化的新型Yb光纤激光器。通过在15m长度的Yb增益光纤和一对光纤光栅对组成的线性谐振腔内直接熔接一段特殊掺杂的Bi/Cr共掺石英光纤,在975nm的半导体激光器连续抽运下,实现了高重复频率的高峰值功率亚纳秒短脉冲激光输出。实验结果表明,输出激光的重复频率与吸收的抽运光功率呈线性关系,脉冲激光峰值功率超过30kW,在吸收抽运功率为8.2W时,光纤激光器获得了重复频率最高为50.2kHz、平均功率为2W的亚纳秒脉冲激光输出。分析实验现象可以发现,在亚纳秒脉冲激光的产生过程中受激布里渊散射起着关键的作用。此外,观测光谱发现在Bi/Cr共掺石英光纤端有非常平坦的红外超连续谱输出,光谱覆盖范围超过1000nm,光谱平坦度小于5dB。A novel all-fiberized Yb-doped fiber laser configuration for passively sub-nanosecond pulse generation is reported. By splicing a piece of Bi/Cr codoped silica fiber to a section of Yb-doped double clad fiber of 15 m in a fiber Bragg grating constructed fiber laser cavity, stable sub-nanosecond pulse train is obtained with a maximal repetition rate of 50.2 kHz and an average output power of 2 W. The calculated peak power exceeds 30 kW. The linear dependence of the pulse repetition rate on the absorbed pump power is confirmed. It is also found that stimulated Brillouin scattering plays a crucial role in the pulse generation. Broadband infrared supercontinuum emission is detected via the Bi/Cr fiber end, which spans over 1000 nm with spectral intensity variation lower than 5 dB.

关 键 词：激光器 亚纳秒 受激布里渊散射 全光纤化 超连续谱 

分 类 号：TN248.1[电子电信—物理电子学]