Dynamic mode matching of internal and external cavities for enhancing the mode-hop-free synchronous tuning characteristics of an external-cavity diode laser
Dynamic mode matching of internal and external cavities for enhancing the mode-hop-free synchronous tuning characteristics of an external-cavity diode laser
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DOI：
10.1007/s00340-019-7335-4
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
Yu Zhu;Zhigang Liu;Xin Zhang;Shan Shao;Haihong Yan
中科院分区：
文献类型：
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作者：
Yu Zhu;Zhigang Liu;Xin Zhang;Shan Shao;Haihong Yan
提出了一种利用同步调谐原理实现低频（< 10 Hz）调谐的外腔半导体激光器。然而，在高频调谐过程中，外腔系统固有的机械振动会被激发，从而破坏内外腔的模式匹配，大大降低了ECDL的无跳模（MHF）调谐范围。为了在高频调谐时获得较宽的MHF范围，我们使用了一种有源内腔模式控制方法，通过电感-电阻-电容（LRC）滤波器来实现内外腔的动态模式匹配。实验结果表明，使用LRC滤波器后，MHF的高频调谐范围得到了显著改善，在中心波长为785 nm的未镀膜半导体激光器上，在30 Hz的调谐频率下，获得了6.21 THz/s的最大波长调谐速率。
This paper proposed an external-cavity diode laser (ECDL) that has low-frequency tuning (< 10 Hz) ability using the synchronous tuning principle. However, during high-frequency tuning, the mechanical vibration of the external-cavity system inherent in the ECDL is excited, which will break the mode matching of the internal and external cavities and greatly decrease the mode-hop-free (MHF) tuning range of the ECDL. To obtain a wide MHF range at high-frequency tuning, we used an active internal-cavity mode control method with an inductance–resistance–capacitance (LRC) filter to implement the dynamic mode matching of the internal and external cavities. After using theLRCfilter, the experimental results indicated that the MHF tuning range at high-frequency tuning was significantly improved and a maximum wavelength tuning rate of 6.21 THz/s was obtained at tuning frequency of 30 Hz using an uncoated laser diode with a central wavelength of 785 nm.