Figure 2
From: Ultranarrow-bandwidth filter based on a thermal EIT medium
Typical EIT spectra in the absence of Zeeman pumping field in (a) and in the presence of that field in (b). The EIT spectrum in (b) shows a subnatural linewidth of around 1.1 MHz and a peak transmission of 67%. Red solid curve in (b) is the theoretical prediction from Eq. (3) under a set of α = 225 and (ΓOP, Ω c , γ) = (90, 4.2, 0.022)Γ. The peak transmission is getting higher with increasing coupling power, shown in (c). The applied powers of the coupling field are 10, 7.5, 5.5, 2.8, 1.4, and 0.70 mW from high to low peak transmissions. The corresponding frequency shifts of EIT peaks are presented in (d). Red line is a linear fit as the guide for the eyes.
