Schultz, J. T.Abend, S.Döring, D.Debs, J. E.Altin, P. A.White, J. D.Robins, NicholasClose, J. D.2016-06-082016-06-080146-9592http://hdl.handle.net/1885/102347We observe coherent, continuous wave, 455nm blue beam production via frequency up-conversion in cesium vapor. Two infrared lasers induce strong double-excitation in a heated cesium vapor cell, allowing the atoms to undergo a double cascade and produce a coherent, collimated, blue beam co-propagating with the two infrared pump lasers.This work has been supported by the Australian Research Council and the National Science Foundation (NSF) (award PHY-0653518). J. T. S. is thankful for a Fulbright Postgraduate Fellowship. S. A. thanks the Studienstiftung des Deutschen Volkes for his scholarship.© 2009 Optical Society of America2009-05-2510.1364/OL.34.002321