波长可调节全正色散掺镱锁模光纤激光器的放大特性

来源 :红外与激光工程 | 被引量 : 0次 | 上传用户:xieyinglan2007
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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1030 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。
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