Journal
APPLIED SCIENCES-BASEL
Volume 10, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/app10207075
Keywords
hollow-cathode lamp; atomic filter; atomic density
Categories
Funding
- National Natural Science Foundation of China (NSFC) [61771067, 61801042, 61631014]
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Using a hollow-cathode lamp (HCL) to build a Faraday anomalous dispersion optical filter (FADOF) is a new method to realize narrow linewidth optical filters. In contrast to other atomic optical filters based on saturated vapors, which work at a relatively high temperature to maintain the atomic density, the HCL device using sputtered particles can work at a much lower temperature. In this work, a rubidium HCL-based FADOF (HCL-FADOF) working at 780 nm is established and carefully tested. With 20 mm cathode length, the transmittance can reach 29% under 18 mA discharge current and 260 G magnetic field at room temperature, which is equivalent to the performance of a saturated vapor-based FADOF (VC-FADOF) at more than 60 degrees C. This work provides a direct comparison of the performance of the HCL-FADOF and the VC-FADOF, which is of great benefit to further studies of atomic filters at normal temperature.
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