We report the upconversion processes that produce violet, blue, green, orange, and red emissions in K<sub>5</sub>Nd(MoO<sub>4</sub>)<sub>4</sub> stoichiometric crystal together with the dynamics and spectral properties of the laser emission. The influence of upconversion energy-transfer processes on the energy storage capacity through the reduction of fluorescence lifetimes of the metastable <sup>4</sup>F<sub>3/2</sub> level is investigated. The experiments were conducted in such a way that the dynamics of the infrared and visible fluorescence was performed under lasing and nonlasing conditions. The dynamics of the upconverted emission shows that both energy-transfer upconversion and excited-state absorption of the laser emission occur. A brief analysis about the polarization properties of the laser emission is presented.
© 2002 Optical Society of America
(140.3580) Lasers and laser optics : Lasers, solid-state
(160.5690) Materials : Rare-earth-doped materials
(170.6280) Medical optics and biotechnology : Spectroscopy, fluorescence and luminescence
(190.7220) Nonlinear optics : Upconversion
Ignacio Iparraguirre, Rolindes Balda, Mihail Voda, Mohamed Al-Saleh, and Joaquin Fernandez, "Infrared-to-visible upconversion in K5Nd(MoO4)4 stoichiometric laser crystal," J. Opt. Soc. Am. B 19, 2911-2920 (2002)