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Linewidths below 100 kHz with external cavity diode lasers

机译:外腔二极管激光器的线宽低于100 kHz

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摘要

The linewidth of external cavity diode lasers (ECDLs) is an increasingly important characteristic for experiments in coherent optical communications and atomic physics. The Schawlow-Townes and time-averaged linewidths depend on free parameters of the design, such as cavity length, power, and grating characteristics. We show that the linewidth is also sensitive to the focus, set by the distance between the laser and the collimating lens, due to the effect on the external cavity backcoupling efficiency. By considering these factors, a simple ECDL can readily achieve linewidths below 100 kHz.
机译:对于相干光通信和原子物理学的实验,外腔二极管激光器(ECDL)的线宽越来越重要。 Schawlow-Townes和时间平均线宽取决于设计的自由参数,例如腔长,功率和光栅特性。我们显示,由于对外腔回耦合效率的影响,线宽对焦点也很敏感,焦点由激光器和准直透镜之间的距离确定。通过考虑这些因素,简单的ECDL可以轻松实现100 kHz以下的线宽。

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