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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。
High power, wavelength adjustable ultra-short pulse light source has great application value. Ytterbium-doped fiber amplification of all positive dispersion mode-locked fiber laser to meet the above requirements of high-quality light sources, and compact structure. Through the experiment, the amplification characteristics of wavelength-tunable all-positive dispersion-mode-locked fiber laser have been fully explored. The change of small signal gain coefficient with signal light wavelength is analyzed. It is found that the maximum gain appears near 1030 nm, and the gain decreases with the increase of signal light wavelength, which is determined by the gain spectrum of the Yb-doped fiber. The gain factor is also analyzed as a function of the pump light power to observe the gain saturation and to amplify the spontaneous emission noise. Also discusses the seed pulse in the amplifier in the time domain and frequency domain distortion. It was found that the pulse broadened slightly due to the dispersion of the group velocity and that the spectrum also slightly expanded due to the self-phase modulation.