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中文摘要：
实验研究了基于掺Yb多芯大模场面积光子晶体光纤的全正色散锁模激光器.增益光纤的18个纤芯呈六角阵列排布,等效的模场直径约为52μm.激光器基于σ腔结构,腔内没有色散补偿元件,通过半导体可饱和吸收镜实现锁模的自启动.实验获得了平均功率为3.3W,脉冲宽度为4.92ps,重复频率为44.68MHz的锁模脉冲输出,对应的单脉冲能量为74nJ,脉冲经腔外光栅对压缩为780fs.
英文摘要：
A mode locked fiber laser based on Yb-doped large mode area photonic crystal fiber operating in the all-normal dispersion regime is experimentally studied.The eighteen cores of the gain fiber are arranged in array-type geometry with an equivalent mode diameter of about 52 μm.A sigma laser cavity is used without using any elements for dispersion compensation.Reliable self-starting mode-locking is achieved using a fast semiconductor saturable absorber mirror.The laser directly produces 4.92 ps chirped pulses at a 44.68 MHz repetition rate for an average power of 3.3 W corresponding to a pulse energy of 74 nJ.The pulses are compressed to 780 fs with a grating pair outside the cavity.
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