Induced-Dichroism-Excited Atomic Line Filter at 1529 nm

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An induced-dichroism-excited atomic line (IDEAL) filter at 1529 nm operating on the transition of 87 Rb 5 2 P3/2-4 2 D3/2 is realized. Its peak transmittance achieves 63.8% at 80 °C by a 13.4 mW/mm 2 laser pumping at 780 nm and the equivalent noise bandwidth is 546 MHz. Detailed experiments show that, compared with the excited-state Faraday anomalous dispersion optical filter and excited-state Voigt atomic line filters which are realized by the same atomic vapor cell, operating on the same transition and under the same pumping intensity, the IDEAL filter achieves the same performance level without the magnetic field. This letter provides a new solution to ultra-narrow optical filtering at 1529 nm, and it is particularly useful in applications which require non-magnetic environments.