Ultranarrow bandwidth tunable atomic filter via quantum interference-induced polarization rotation in Rb vapor

Abstract

We report the experimental demonstration of an ultranarrow bandwidth atomic filter by optically induced polarization rotation in multilevel electromagnetically induced transparency systems in hot Rb vapor. With a coupling intensity of 2.3 W/cm 2 , the filter shows a peak transmission of 33.2% and a bandwidth of 10 MHz. By altering the coupling frequency, a broad tuning range of several Doppler linewidths of the D1 line transitions of 87 Rb atoms can be obtained. The presented atomic filter has useful features of ultranarrow bandwidth, and the operating frequency can be tuned resonance with the atomic transition. Such narrowband tunable atomic filter can be used as an efficient noise rejection tool in classical and quantum optical applications.

Demonstration of Faraday anomalous dispersion optical filter with reflection configuration

“…Faraday anomalous dispersion optical filter (FADOF) based on the atomic transitions in a vapor cell is usually used to remove the background noise from weak signal light, or used as frequency-selecting element for the strong signal light at the level of ∼ mW. [1][2][3][4] In comparison with the usual interference filter, FADOF has many advantages such as narrow bandwidth, excellent background rejection, and high transmittance, [5][6][7] so it has been widely applied to the optical communication, [8,9] underwater optical communication, [10,11] laser lidar remote sensing system, [12,13] Faraday laser, [14] laser frequency stabilization, [15] optical clocks, [16] etc. Since FADOF was demonstrated in 1956, [17] it has been studied theoretically and experimentally.…”

Polarization rotation spectral profiles for the D2 line of 87Rb atoms: theory and experiment

“…Developments regarding electromagnetically induced transparency (EIT) [13] and electromagnetically induced absorption (EIA) [14,15] have provided many different types of sub-natural line profiles near the EIT and EIA regions. EIT systems for the PRS with Λ [ [16][17][18] and ladder [11] types in Rb thermal atoms have been investigated to reveal the saturation effects of a probe beam on nonlinear rotation signals, as analyzed with the rate equation model. The PRS due to coherence effects of the EIT of Rb atoms with V-type configuration [10] have also been studied.…”