High accuracy measurement of the quantum efficiency using radiation pressure
High accuracy measurement of the quantum efficiency using radiation pressure
复制标题
利用辐射压高精度测量量子效率
DOI：
10.1088/1742-6596/363/1/012002
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Kazuhiro Agatsuma
中科院分区：
文献类型：
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作者：
滝野 奨;他MOA;王岩;Y.Obayashi;Kazuhiro Agatsuma
本文报告了一种利用辐射压力精确测量激光功率的新方法的初步研究。我们的目标是测量误差在百分之一以内的激光功率，然后获得准确的光电二极管量子效率 (QE)。由于测量激光功率的不确定性，QE 的典型误差仍然只有几个百分点，因此激光功率的精确测量有助于精确估计 QE。我们的实验装置是一个悬挂式迈克尔逊干涉仪，其中一个摆很小，由一个 20 毫克的镜子和 10 微米的光纤组成。这个小镜子的运动对辐射压力的变化非常敏感。因此，可以通过测量反射镜的位移来精确计数入射（强度调制）激光束中的光子数。我们安装了设备，并找到了适合精确测量的频带。使用反馈信号观察由辐射压力引起的位移。
Preliminary investigations of a novel method to measure the laser power accurately using the radiation pressure are reported here. We aim to measure the laser power within one percent error to then obtain an accurate quantum efficiency (QE) of a photodiode. Since the typical error of QE is still a few percent due to the uncertainty of measured laser power, an accurate measurement of the laser power contributes a precise estimation of the QE. Our experimental setup is a suspended Michelson interferometer, where one of the pendulums is small, consisting of a 20-mg mirror and 10-um fiber. The motion of this small mirror is very sensitive to changes in radiation pressure. Due to this, the number of photons in the incident (intensity modulated) laser beam can be counted accurately by measuring displacement of the mirror. We set up the apparatus, and have found a suitable frequency band for the accurate measurement. Displacement caused by the radiation pressure was observed using the feedback signal.