We report electrically pumped, cw laser action near 405 nm from Nd<sup>3+</sup> -doped δ -alumina nanopowders. To our knowledge, this is the first report of stimulated emission from the high-lying F<sup>2</sup> -excited states, achieved through feedback from strong elastic scattering of light over transport path lengths shorter than half a wavelength.
© 2002 Optical Society of America
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3610) Lasers and laser optics : Lasers, ultraviolet
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
B. Li, G. Williams, S. C. Rand, T. Hinklin, and R. M. Laine, "Continuous-wave ultraviolet laser action in strongly scattering Nd-doped alumina," Opt. Lett. 27, 394-396 (2002)