低阈值自启动Mamyshev振荡器的研究
Investigation on the self-starting Mamyshev oscillator with low threshold
摘要：
本文介绍了一种基于单模光纤结构的锁模Mamyshev振荡器。研究了光谱滤波器和抽运功率对激光输出特性的影响。当光谱滤波器中心波长远离增益谱峰值时，在高泵浦功率下，激光脉冲的演化与增益整形的演化有一定的偏离。此外，在泵浦功率为520 mW时，实现了自启动锁模，这可能得益于合适的偏振条件和较小的光谱滤波器间距。该激光器可以产生1.89 nJ的超短脉冲，20 dB谱宽为54.6 nm。脉冲宽度可外压缩到64.69 fs，峰值功率为21.3 kW。
英文摘要：
We have demonstrated a mode-locked Mamyshev oscillator based on a single-mode-fibre configuration with low threshould. The influences of spectral filters and the pump power on the output laser characteristics have been investigated. In the case with spectral-filter central wavelength far away from the peak of gain spectrum, the laser pulses have deviated slightly from similariton evolution with gain-shaping under high pump power. Moreover, self-starting mode-locking operation has been realized when the pump power was only 520 mW, which might benefit from the appropriate polarization conditions and small spectral filter separation. The laser can generate 1.89-nJ ultra-short pulses with 20-dB spectral width of 54.6 nm. The pulse duration can be compressed externally to 64.69 fs with the peak power of 21.3 kW.
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