具有两个多模光纤之间的偏移接合作为可饱和吸收体的锁模光纤laser
Mode-locked fiber laser with offset splicing between two multimode fibers as a saturable absorber
摘要：
提出了一种基于两种渐变折射率多模光纤偏置拼接技术的新型锁模光纤激光器，并进行了实验验证。偏置拼接点结构通过非线性多模干涉机制充当可饱和吸收体。该器件的吸收调制深度为2.8%，饱和强度为2.5 MW/cm 2。当泵浦功率达到114 mW时，光纤激光器工作在稳定的锁模状态。该激光器的振荡波长为1039 nm，脉冲宽度为17.6 ps，重复频率为32.619 MHz，信噪比为65 dB。光纤激光器具有成本低、损伤阈值高、易于制造等优点，在超快光子学和工业加工等领域有着广泛的应用前景。
英文摘要：
A novel mode-locked fiber laser based on offset splicing technology between two kinds of graded index multimode fibers is proposed and experimentally demonstrated. The offset splice spot structure acts as a saturable absorber via nonlinear multimodal interference mechanism. The absorption modulation depth of the device is 2.8%, with a saturation intensity of 2.5 MW/cm2. The fiber laser operates at a stable mode-locked state when the pump power reaches 114 mW. The laser oscillates at 1039 nm with a pulsewidth of 17.6 ps, a repetition rate of 32.619 MHz, and a high signal noise ratio of 65 dB. The fiber laser is superior in terms of low cost, high damage threshold, and easy fabrication, thus providing many potential applications in ultrafast photonics and industrial processing.
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