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Cavity Ringdown Heterodyne Spectroscopy: High Sensitivity with Microwatt Light Power

机译:腔振铃外差光谱:具有微瓦光功率的高灵敏度

摘要

We present an ac heterodyne technique in cavity ringdown spectroscopy that permits 1×10−10 absorption sensitivity with microwatt-level light power. Two cavity modes, one probing the empty cavity and the other probing intracavity absorption, are excited simultaneously but with their intensities temporally out of phase, with one mode decaying and the other rising. Heterodyne detection between the two modes reveals the dynamic time constants associated with the empty cavity and the additional intracavity gas absorption. The method offers a quick comparison between the on- and off-resonance information, a prerequisite to reaching the fundamental shot-noise limit. This simple and yet important improvement of cavity ringdown spectroscopy should lead to the enhanced performance of a wide range of applications.
机译:我们在腔衰荡光谱中提出了一种交流外差技术,该技术允许1×10-10吸收灵敏度和微瓦级光功率。两种腔模式同时被激发,一种模式探测空腔,另一种模式探测腔内吸收,但是它们的强度在时间上是异相的,一种模式衰减而另一种模式上升。两种模式之间的异戊二烯检测显示出与空腔和额外的腔内气体吸收相关的动态时间常数。该方法可以快速比较共振信息和共振信息,这是达到基本散粒噪声极限的前提。腔衰荡光谱学的这一简单而重要的改进应该导致​​广泛应用的性能提高。

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  • 作者

    Ye Jun; Hall John L.;

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  • 年度 2000
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