Observations of four types of pulses in a fiber laser with large net-normal dispersion.
Observations of four types of pulses in a fiber laser with large net-normal dispersion.
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DOI：
10.1364/oe.19.007616
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发表时间：
2011-04
期刊：
影响因子：
3.8
通讯作者：
Leiran Wang;Xueming Liu;Y. Gong;D. Mao;L. Duan
中科院分区：
文献类型：
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作者：
Leiran Wang;Xueming Liu;Y. Gong;D. Mao;L. Duan
在一台大净法向色散掺铒光纤激光器中，实验获得了四种不同类型的脉冲。通过适当调节偏振态，该激光器可以输出矩形谱、高斯谱、宽带谱和类噪声脉冲。这些脉冲具有明显不同的特征。RS脉冲可以很容易地被压缩到飞秒量级，但脉冲能量受到多脉冲整形趋势的限制。GS和BS脉冲始终保持单脉冲工作，具有更高的脉冲能量和积累更多的啁啾。将脉冲注入光子晶体光纤后，BS脉冲可以产生带宽>700 nm的超连续谱，GS脉冲可以产生带宽约400 nm的超连续谱，而RS脉冲几乎不能产生超连续谱。背后的连续生成的物理机制进行了定性研究有关不同的操作制度。这一工作有助于对正常色散脉冲的深入理解。
Four different types of pulses are experimentally obtained in one erbium-doped all-fiber laser with large net-normal dispersion. The proposed laser can deliver the rectangular-spectrum (RS), Gaussian-spectrum (GS), broadband-spectrum (BS), and noise-like pulses by appropriately adjusting the polarization states. These kinds of pulses have distinctly different characteristics. The RS pulses can easily be compressed to femtosecond level whereas the pulse energy is restricted by the trend of multi-pulse shaping with excessive pump. The GS and BS pulses always maintain the single-pulse operation with much higher pulse-energy and accumulate much more chirp. After launching the pulses into the photonic-crystal fiber, the supercontinuum can be generated with the bandwidth of >700 nm by the BS pulses and of ~400 nm by the GS pulses, whereas it can hardly be generated by the RS pulses. The physical mechanisms behind the continuum generation are qualitatively investigated relating to different operating regimes. This work could help to a deeper insight of the normal-dispersion pulses.