Anomalous dispersion in atomic line filters applied for spatial frequency detection.
Anomalous dispersion in atomic line filters applied for spatial frequency detection.
复制标题
用于空间频率检测的原子线滤波器中的反常色散。
DOI：
10.1364/ao.48.005948
复制
发表时间：
2009
期刊：
影响因子：
1.9
通讯作者：
T. Roesgen
中科院分区：
文献类型：
--
作者：
A. Landolt;T. Roesgen
利用原子线滤波器在谐振跃迁附近的反常色散进行了全场频率测量。讨论了线形函数对原子蒸气中近共振色散的影响以及提高灵敏度的可能性。从模型计算的倍频Nd:YAG激光波长下碘蒸气的吸收，通过Kramers-Kronig关系得到相应的折射率。这两个变量是用来评估性能的碘蒸气电池作为色散元件在干涉设置多普勒频移检测。在良好的一致性下，将该装置的预测灵敏度与实验校准进行了比较。观测到的差异归因于吸收模型中高斯线形的假设。在旋转圆盘实验中验证了该技术的全场多普勒测频能力，并对测量性能进行了评价。
The anomalous dispersion of an atomic line filter near a resonant transition is exploited for full-field frequency measurements. The influence of the line shape function on the dispersion in atomic vapors near resonance and the possibilities to increase sensitivity are discussed. From the model-calculated absorption of iodine vapor at frequency-doubled Nd:YAG laser wavelengths, the corresponding refractive index is obtained through the Kramers-Kronig relations. Both variables are used to assess the performance of a iodine vapor cell as a dispersive element in an interferometric setup for Doppler frequency shift detection. With good agreement, the predicted sensitivity of the setup is compared to an experimental calibration. Observed discrepancies are attributed to the assumption of a Gaussian line shape in the absorption model. The full-field Doppler frequency measurement capacity of the technique is demonstrated in a rotating disk experiment, and the measurement performance is assessed.