Author(s): Y. K. Wu, J. Yan, H. Hao, J. Y. Li, S. F. Mikhailov, V. G. Popov, N. A. Vinokurov, S. Huang, and J. Wu
A two color free electron laser with simultaneous infrared and ultraviolet lasing is demonstrated using the electron storage ring at Duke University.

[Phys. Rev. Lett. 115, 184801] Published Mon Oct 26, 2015