Control and active stabilization of the linewidth of an ECDL
Control and active stabilization of the linewidth of an ECDL
复制标题
ECDL 线宽的控制和主动稳定
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
T. Walther
中科院分区：
文献类型：
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作者：
T. Führer;T. Walther
利用外差法和自外差法测量了偏振锁定外腔半导体激光器（ECDL）的线宽。我们使用一个模型，能够提供单独的贡献的白色，粉红色和红色噪声的整体线宽来分析测量拍频光谱。这些光谱是在调谐外腔的同时获得的，并且是泵浦电流和反馈电平的函数。凭借我们的锁定技术，我们发现，线宽可以调整和最小化，通过简单地改变闭环控制的设定点。线宽的这种控制适用于使用偏振锁定的任何ECDL。对于我们的特定ECDL，我们能够将总线宽从108 kHz调谐到20 kHz。此外，我们实现了较低的白色噪声水平的ECDL相比，自由运行的。
The linewidth of a polarization-locked external cavity diode laser (ECDL) is explored employing heterodyne as well as self-heterodyne measurements. We use a model capable of providing the individual contributions of white, pink and red noise to the overall linewidth to analyze the measured beat spectra. These spectra are obtained while tuning the external cavity as well as a function of pump current and feedback level. By virtue of our locking technique, we find that the linewidth can be adjusted and minimized by simply altering the setpoint of the closed-loop control. This control of the linewidth is applicable for any ECDL using polarization locking. For our particular ECDL, we are able to tune the overall linewidth from ≈8 kHz to 20 kHz. Moreover, we achieve a lower white noise level of the ECDL compared to a free running one.