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人眼安全的2μm激光在遥感、生物医疗等领域具有重要的应用。2μm单频光纤激光器线宽窄、相干长度长、波长可调谐且结构紧凑、设备可靠耐用,受到了研究人员的广泛关注。采用短腔结构,加大纵模间隔,保证激光器无跳模运转,是实现单频光纤激光的有效途径。传统的稀土掺杂石英光纤由于本身玻璃网络结构的原因,稀土离子溶解度较低,短腔结构难以获得足够的增益。而多组分玻璃,由于无定形的玻璃网络结构,稀土离子掺杂浓度可以比石英光纤高1~2个数量级,因此基于
Human eye-safe 2μm laser has important applications in remote sensing, biomedical and other fields. The narrow bandwidth, long coherence length, tunable wavelength and compact structure of the 2μm single-frequency fiber laser have attracted a lot of researchers’ attention. The use of a short cavity structure, increasing the longitudinal mode spacing, to ensure that the laser without mode hopping operation is an effective way to achieve single-frequency fiber laser. The traditional rare earth doped silica fiber due to its own glass network structure, rare earth ions solubility is low, short-cavity structure is difficult to obtain sufficient gain. The multi-component glass, due to the amorphous glass network structure, rare earth ion doping concentration than quartz optical fiber can be higher by 1 to 2 orders of magnitude, based on