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目前,在被动锁模掺铒光纤激光器中,进行腔内色散补偿的方法主要包括:在激光谐振腔内熔接一段具有正常色散的光子晶体光纤、插入具有正常色散的光栅对,以及利用具有正常色散的啁啾光纤光栅等。针对目前腔内色散补偿方法存在的耦合效率低、环境稳定性差、色散量不易调节等不足,设计了一种由偏振合束器、色散补偿光纤和法拉第旋转镜构成的线形支路进行腔内色散精确补偿,采用透射式可饱和吸收体实现自启动锁模,并结合混合光器件,实验获得了重复频率为82.84 MHz、平均功率为10mW、脉冲宽度为381fs的飞秒脉冲保偏输出,作为种子源,可广泛应用于太赫兹产生、生物医学成像、超快光谱学等领域。
At present, in the passive mode-locked erbium-doped fiber laser, the methods for performing the intracavity dispersion compensation mainly include: fusing a section of photonic crystal fiber with normal dispersion in a laser cavity, inserting a grating pair with normal dispersion, Chirped fiber grating and so on. In order to overcome the shortcomings of low efficiency, poor stability and dispersion of chromatic dispersion, the linear branch consisting of a polarization beam combiner, a dispersion compensation fiber and a Faraday rotating mirror is designed for intracavity dispersion Accurate compensation, the use of transmissive saturable absorber to achieve self-starting mode-locking, combined with a hybrid optical device, experimental repetition frequency of 82.84 MHz, the average power of 10mW, the pulse width of 381fs femtosecond pulse polarization-maintaining output, as a seed Source, can be widely used in terahertz production, biomedical imaging, ultrafast spectroscopy and other fields.