波长可调节全正色散掺镱锁模光纤激光器的放大特性(英文)  

Amplification of tunable ANDi Yb-doped mode-locked fiber laser

作　　者：华弋[1] 肖晓晟[1] 

机构地区：[1]清华大学精密仪器系精密仪器与测量技术国家重点实验室,北京100084

出　　处：《红外与激光工程》2014年第12期3924-3927,共4页Infrared and Laser Engineering

基　　金：清华大学自主科研计划

摘　　要：高功率,波长可调超短脉冲光源具有重大的应用价值。采用掺镱光纤放大的全正色散锁模光纤激光器能够满足以上优质光源的要求,并且结构紧凑。通过实验全面探索了波长可调节全正色散锁模光纤激光器的放大特性。分析了小信号增益系数随着信号光波长的变化。发现最大增益出现在波长为1 030 nm附近,并且增益随着信号光波长的增大而减小,这是由于掺镱光纤的增益谱特性决定的。也分析了增益系数随泵浦光功率的变化,观察增益饱和现象和放大自发辐射噪声。也讨论了种子脉冲在放大器中的时域与频域畸变。发现脉冲因为群速度色散而轻微展宽,频谱因为自相位调制也会发生轻微展宽。Ultrashort pulse source with high energy and tunable wavelength is highly demanded for a lot of applications.Amplified all-normal-dispersion（ANDi） mode-locked fiber laser with gain medium of Ybdoped fiber is a compact and excellent source that fulfills those requirements.In this paper,amplification of tunable ANDi Yb-doped mode-locked fiber lasers was experimentally investigated.The gain versus signal wavelength was analyzed.It was found that the maximum gain was obtained near 1 030 nm and the gain decreased as wavelength increased,due to the gain spectrum of Yb-doped fiber.The gain versus pump power was also investigated.Gain saturation and the effect of ASE noise on gain were observed.The spectral and temporal distortions of pulse seed induced by fiber amplification were discussed.The pulse was broadened slightlydue to dispersion.The spectrum was distorted by ASE noise and limited gain bandwidth.If the gain is large and the power of amplified signal is high,the spectrum will be broadened by the effect of self-phase modulation（SPM）.

关 键 词：放大器 全正色散 锁模 

分 类 号：G305[文化科学]