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A Fraunhofer-wavelength magnetooptic atomic filter at 422.7 nm

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2 Author(s)
Yat Ching Chan ; The Aerosp. Corp., Los Angeles, CA, USA ; Gelbwachs, J.A.

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(4p1P1-4s1 S0) 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

Published in:

Quantum Electronics, IEEE Journal of  (Volume:29 ,  Issue: 8 )