低阈值高稳定性的全保偏锁模光纤激光器

Low threshold and high stability all polarization-maintaining mode-locked fiber laser

报道了一种基于色散补偿的低阈值自启动的全保偏“9”字腔光纤激光器。在谐振腔结构中加入一段色散补偿光纤进行色散补偿,同时加入相移器提供非线性相移,产生超短脉冲输出。当泵浦功率达到80 mW时,可实现自启动的孤子锁模,重复频率为22.18 MHz,中心波长为1557 nm,脉冲宽度为536 fs,信噪比为73 dB。在该稳定锁模状态下的激光器输出平均功率为1.04 mW,对应脉冲能量为0.046 nJ。该激光器结构简单,具有低阈值、自启动的优势,可作为种子源,广泛应用于太赫兹产生、生物医学成像、超快光谱学等领域。

In this paper,a low threshold self-starting all polarization-maintaining nine-cavity fiber laser based on dispersion compensation is proposed.A section of dispersion compensation fiber is added into the resonant cavity structure to compensate dispersion,and a phase shifter is added to provide a non-linear phase shift to produce an ultra-short pulse output.When the pump power is up to 80 mW,the self-starting soliton mode locked could be realized,with a repetition rate of 22.18 MHz,a central wavelength of 1557 nm,a pulse width of 536 fs and a signal-to-noise ratio of more than 73 dB.The laser output in this stable mode-locked state has an average power of 1.04 mW,corresponding to pulse energy of 0.046 nJ.The laser has a simple structure,low threshold and self-starting advantages,and can be used as a seed source for a wide range of applications in terahertz generation,biomedical imaging,ultrafast spectroscopy and other fields.