Efficient frequency conversion of incoherent fluorescent light

Abstract
We demonstrate efficient replication of an incoherent fluorescent light with the 1770cm1 broad bandwidth into its Raman sidebands with frequency spacing of 4150 cm1 in a thin hydrogen crystal. We achieve a high conversion efficiency of 22% per sideband using a sufficiently large Raman coherence prepared by two collinearly propagating ns laser fields.