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中国科学通报：英文版

Narrower atomic filter at 422.7 nm based on thermal Ca beam

Zhichao, Xü, Xiaobo, Xue, Duo Duo, Pan, Xiaogang, Zhang, Wei Wei, Zhuang, JingBiao, Chen

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

1 S 0 1 P 在 422.7 点的 1 )? nm ，它匹配一根强壮的太阳的 Fraunhofer 线，被利用。一种合拢的九横梁的旅行波浪配置被采用，并且最大的传播效率被测量是 7.3 ?% 。590 的 sub-Doppler 传播带宽 ? MHz，比狭窄得多 2.2 ? 在激烈的原子房间的 GHz Doppler 宽度，第一次被获得。

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1 S 0 1 P 在 422.7 点的 1 )? nm ，它匹配一根强壮的太阳的 Fraunhofer 线，被利用。一种合拢的九横梁的旅行波浪配置被采用，并且最大的传播效率被测量是 7.3 ?% 。590 的 sub-Doppler 传播带宽 ? MHz，比狭窄得多 2.2 ? 在激烈的原子房间的 GHz Doppler 宽度，第一次被获得。
A demonstration of the first magnetooptic atomic filter that overlays a strong solar Fraunhofer line is reported. Compared with alkali magnetooptic filters, this filter enjoys a large reduction in solar interference and a significant decrease in the number of noise passbands. The filter utilizes the strong Ca(4p/sup 1/P/sub 1/-4s/sup 1/S/sub 0/) transition at 422.7 nm. Under the weak magnetic field experimental conditions, a maximum transmission efficiency of 55% and a symmetrical double-peaked transmission spectrum with 1.5 GHz wide passbands were observed. The filter's frequency response was measured with a laser intensity modulation technique. No falloff was observed at 176 MHz, the highest frequency available with the apparatus. Calculations indicate that further improvements in filter performance can be achieved by optimizing the magnetic field and the cell temperature.>
We demonstrate what is to our knowledge the first atomic optical filter that uses velocity selection to achieve a passband width that is less than the Doppler width of the filtering transition. A narrow-linewidth pump laser is used to induce circular birefringence in a narrow velocity class of atoms in a dense potassium vapor for 694-nm light resonant with the 4P(3/2)-6S(1/2) transition. The filter displays a single 170-MHz passband at a peak transmittance of 9.5%. The bandwidth is an order of magnitude lower than that of previously demonstrated atomic optical filters.