Note: An ultranarrow bandpass filter system for single-photon experiments in quantum optics

Höckel, David; Martin, Eugen; Benson, Oliver
February 2010
Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p026108
Academic Journal
We describe a combined ultranarrow bandpass filtering setup for single-photon experiments in quantum optics. The filter is particularly suitable for single-photon electromagnetically induced transparency (EIT) experiments, but can also be used in several similar applications. A multipass planar Fabry–Pérot etalon together with polarization filters and spatial filtering allows 114 dB pump beam suppression, while the signal beam is attenuated by just 4 dB, although both wavelengths are only separated by 0.025 nm (9.2 GHz). The multipass etalon alone accounts for 46 dB suppression while it has a peak transmission of 65%. We demonstrate EIT experiments in Cs vapor at room temperature with probe power in the femtowatt regime using this filter.


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