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Electromagnetically induced transparency (EIT) resonances using the$5\rm{S}_{1/2}\rightarrow5\rm{P}_{3/2}\rightarrow5\rm{D}_{5/2}$ ladder-systemin optically thick Rb atomic vapour are studied. We observe a strong linenarrowing effect and gain at the $5\rm{S}_{1/2}\rightarrow5\rm{P}_{3/2}$transition wavelength due to an energy-pooling assisted frequency conversionwith characteristics similar to four-wave mixing. As a result it is possible toobserve tunable and switchable transparency resonances with amplitude close to$100\%$ and a linewidth of 15 MHz. In addition, the large line narrowing effectallows resolution of $^{85}$Rb $5\rm{D}_{5/2}$ hyperfine structure even in thepresence of strong power broadening.

Active narrowband filtering, line narrowing and gain using ladder electromagnetically induced transparency in an optically thick atomic vapour