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All-fiber passively mode-locked laser based on an electron beam evaporation grown Co2+:ZnSe film saturable absorber
Optical Materials Express ( IF 2.8 ) Pub Date : 2021-05-11 , DOI: 10.1364/ome.423548
Zhujing Wu 1 , Jiangyun Dai 2 , Yajie Wu 1 , Jiulin Yang 1 , Hong Zhang 1 , Shouhuan Zhou 1, 3
Affiliation  

We experimentally demonstrated an all-fiber mode-locked erbium-doped laser based on Co2+:ZnSe (Cobalt, Zinc Selenide) thin film as the saturable absorber (SA), which was grown on the fiber taper by electron beam (e-beam) evaporation technology. The modulation depth, non-saturable loss and saturation intensity were found to be ∼12%, 76% and 1.89 MW/cm2, respectively. The X ray diffraction (XRD) results showed that the Co2+:ZnSe thin film was provided with the cubic zinc blende structure. The scanning electron microscope (SEM) and atomic force microscopy (AFM) images showed the prepared thin film has a smooth and uniform surface. When the fiber-taper Co2+:ZnSe SA was inserted into an erbium-doped fiber laser cavity, a stable mode-locked pulse was obtained. The mode-locked pulses had a pulse repetition rate of 17.83 MHz and pulse duration of ∼4 ns throughout the mode-locked operation range of 200-600 mW. The recorded maximum average output power was ∼4.88 mW. The signal to noise ratio (SNR) was obtained to be 64.9 dB, which indicates the favorable stability of the mode-locked pulse. These results demonstrate the Co2+:ZnSe thin film grown on a fiber taper has high optical quality and implementation of stable pulse operation on passively mode-locked Er-doped fiber lasers.

中文翻译:

基于电子束蒸发生长的 Co 2+ :ZnSe 薄膜可饱和吸收体的全光纤被动锁模激光器

我们通过实验证明了一种基于 Co 2+ :ZnSe(钴、硒化锌)薄膜作为可饱和吸收体 (SA)的全光纤锁模掺铒激光器,该激光器通过电子束在光纤锥形上生长 (e-束)蒸发技术。调制深度、非饱和损耗和饱和强度分别为~12%、76% 和1.89 MW/cm 2。X射线衍射(XRD)结果表明Co 2+ :ZnSe薄膜具有立方闪锌矿结构。扫描电子显微镜 (SEM) 和原子力显微镜 (AFM) 图像显示制备的薄膜具有光滑均匀的表面。当纤维锥度 Co 2+:ZnSe SA 插入掺铒光纤激光器腔内,得到稳定的锁模脉冲。在整个 200-600 mW 的锁模操作范围内,锁模脉冲的脉冲重复率为 17.83 MHz,脉冲持续时间约为 4 ns。记录的最大平均输出功率约为 4.88 mW。获得的信噪比 (SNR) 为 64.9 dB,这表明锁模脉冲具有良好的稳定性。这些结果表明,在光纤锥形上生长的 Co 2+ :ZnSe 薄膜具有高光学质量,并且在被动锁模掺铒光纤激光器上实现了稳定的脉冲操作。
更新日期:2021-06-01
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