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Raman interactions in alkali vapours are used in applications such as atomicclocks, optical signal processing, generation of squeezed light and Ramanquantum memories for temporal multiplexing. To achieve a strong interaction thealkali ensemble needs both a large optical depth and a high level ofspin-polarisation. We implement a technique known as quenching using amolecular buffer gas which allows near-perfect spin-polarisation of over$99.5\%$ in caesium vapour at high optical depths of up to $\sim 2 \times10^5$; a factor of 4 higher than can be achieved without quenching. We use thissystem to explore efficient light storage with high gain in a GHz bandwidthRaman memory.

High Efficiency Raman Memory by Suppressing Radiation Trapping