With the cavity length increasing, the resonant frequency will converge to the zero-group-velocity frequency gradually.
随着谐振腔长度的增加,共振态频率将逐渐收敛于零群速度频率点处。
参考来源 - 低色散低损耗表面等离子体慢光波导的理论研究·2,447,543篇论文数据，部分数据来源于NoteExpress
进而对L波段光纤激光器进行了深入的探讨，并分析了影响激光器输出的因素：谐振腔长、掺铒光纤长度，且做了相应的理论分析。
Then L-band fiber laser is discussed in detail. Factors that influenced the output of laser, such as resonance length, erbium-doped length are analyzed theoretically.
本文指出，在光学谐振腔的研究中应当区分用程函、有效光程、激活介质的几何长度等物理量。
This article has shown that it is necessary to distinguish the eikonal function, effective optical path and geometrical length etc. of active medium while investigating optical resonators.
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