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报道了一种环形腔全光纤掺Yb3+光纤(YDF)激光器的中出现的多波长锁模现象。在腔内无任何选频元件或常规可饱和吸收体的情况下,仅靠YDF的非均匀加宽效应以及增益光纤未泵浦部分的等效可饱和吸收作用实现了稳定的多波长锁模输出,并进行了相关的分析。当泵浦功率为128mW时,得到了稳定的平均功率为1.5mW、重复频率为14.85MHz的基频锁模脉冲序列,边模抑制比为60dB。当泵浦功率逐步增加时,依然可以获得稳定的锁模脉冲,其光谱出现了多个波长峰值,中心波长在1 035nm左右,波长间隔平均为1.5nm,调整偏振控制器(PC),波长数和波长间隔会发生相应的改变。最大泵浦功率达到330mW时,可得到6个等间距的波长输出,平均输出功率为7.23mW。
Reported a multi-wavelength mode-locking phenomenon in a ring cavity all-fiber doped Yb3 + fiber (YDF) laser. In the absence of any selective element or conventional saturable absorber in the cavity, a stable multi-wavelength mode-locked output is achieved solely by the non-uniform broadening effect of the YDF and the equivalent saturable absorption of the un-pumped portion of the gain fiber , And conducted a related analysis. When the pump power is 128mW, a stable fundamental power mode-locked pulse sequence with a mean power of 1.5mW and a repetition frequency of 14.85MHz is obtained, and the side mode suppression ratio is 60dB. When the pump power is gradually increased, a stable mode-locked pulse can still be obtained. The spectrum appears multiple wavelength peaks with a center wavelength of about 1 035 nm and an average wavelength interval of 1.5 nm. The polarization controller (PC), the number of wavelengths And the wavelength interval will change accordingly. When the maximum pump power reaches 330mW, six equally spaced wavelength outputs can be obtained, with an average output power of 7.23mW.