Atomic Coherence Effects of Scattered Light in a $\Lambda $-Type Atomic System of D$_{\mathrm{1}}$-line of $^{\mathrm{85}}$Rb Atoms

We report the two-photon coherence effects by scattered light in D$_{\mathrm{1}}$--line of $^{\mathrm{85}}$Rb atoms, such as electromagnetically induced transparency (EIT), electromagnetically induced absorption (EIA), and electromagnetically induced focusing (EIF), in a paraffin-coated Rb vapor cell. Especially, according to the direction of the scattered light, sub-natural width EIA-like and EIT spectra of the scattered light were measured simultaneously. We will illuminate the interesting spectra of the scattered light as two-photon coherence effects.