Želudevičius J, Danilevičius R, Viskontas K, Rusteika N, Regelskis K
Department of Laser Technology, Center for Physical Sciences & Technology, Savanoriu Ave 231, Vilnius, Lithuania.
Opt Express. 2013 Mar 11;21(5):5338-45. doi: 10.1364/OE.21.005338.
Results of numerical and experimental investigations of the simple fiber CPA system seeded by nearly bandwidth-limited pulses from the picosecond oscillator are presented. We utilized self-phase modulation in a stretcher fiber to broaden the pulse spectrum and dispersion of the fiber to stretch pulses in time. During amplification in the ytterbium-doped CCC fiber, gain-shaping and self-phase modulation effects were observed, which improved pulse compression with a bulk diffraction grating compressor. After compression with spectral filtering, pulses with the duration of 400 fs and energy as high as 50 µJ were achieved, and the output beam quality was nearly diffraction-limited.
本文给出了由皮秒振荡器输出的近带宽限制脉冲作为种子源的简单光纤啁啾脉冲放大（CPA）系统的数值和实验研究结果。我们利用展宽器光纤中的自相位调制来展宽脉冲光谱，并利用光纤的色散在时间上拉伸脉冲。在掺镱CCC光纤放大过程中，观察到增益整形和自相位调制效应，这有助于使用体衍射光栅压缩器进行脉冲压缩。经过光谱滤波压缩后，获得了脉宽为400 fs、能量高达50 μJ的脉冲，且输出光束质量接近衍射极限。
