Characterizing optical resonances using spatial mode reshaping
Characterizing optical resonances using spatial mode reshaping
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DOI：
10.1364/optica.5.001414
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发表时间：
2018-11
期刊：
影响因子：
10.4
通讯作者：
Wei Zhang-;Aaron Charous;M. Nagai;D. Mittleman;R. Mendis
中科院分区：
文献类型：
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作者：
Wei Zhang-;Aaron Charous;M. Nagai;D. Mittleman;R. Mendis
精确表征窄（高Q）谐振的宽度可能非常具有挑战性，需要高分辨率光栅光谱仪或具有长延迟范围的傅里叶变换光谱仪。在这里，我们描述了一种新的技术，以确定基于空间测量的谐振的Q，不受传统方法相同的限制。我们从理论上表明，这种技术可以给出一个准确的测量Q基本上任何一组输入光束参数，即使测量的光谱分辨率是不够的，以解决共振的线宽。我们证实了这一惊人的结果与数值模拟和实验测量。
Accurately characterizing the width of a narrow (high Q) resonance can be quite challenging, requiring either a high-resolution grating spectrometer or a Fourier transform spectrometer with a long delay range. Here, we describe a new technique to determine the Q of a resonance based on spatial measurements that is not subject to the same limitations as conventional methods. We theoretically show that this technique can give an accurate measurement of Q for essentially any set of input beam parameters, even if the spectral resolution of the measurement is inadequate to resolve the linewidth of the resonance. We confirm this striking result with both numerical simulations and experimental measurements.