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

Abstract

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

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Cited by in corpus (4)

• A practical guide to electromagnetically induced transparency in atomic vapor
• Atomic Faraday filter with equivalent noise bandwidth less than 1 GHz
• Amplified spontaneous emission at 5.23 um in two-photon excited Rb vapour
• Comparison of collimated blue light generation in ${}^{85}$Rb atoms via the D${}_1$ and D${}_2$ lines