A comparison of laser emission in highly doped (2.4-and 3.5-at. %) Nd:YAG crystals is made for conventional 808-nm pumping in F<sub>5/2</sub><sup>4</sup> and resonant pumping at 885 nm in the band that collects the hot transitions Z<sub>2</sub>→R<sub>1</sub> and Z<sub>3</sub>→R<sub>2</sub> of I<sub>9/2</sub><sup>4</sup>→F<sub>3/2</sub><sup>4</sup> absorption. A systematic improvement of the laser parameters (slope efficiency and emission threshold) in absorbed power under hot-band pumping is observed, as expected from the reduction of the pump’s quantum defect. Together with the expected reduction of heat generation, resonant hot-band pumping in concentrated components shows prospect for greatly increasing the emission capabilities of the Nd:YAG lasers.
© 2001 Optical Society of America
(140.3380) Lasers and laser optics : Laser materials
(140.3530) Lasers and laser optics : Lasers, neodymium
(160.5690) Materials : Rare-earth-doped materials
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
V. Lupei, N. Pavel, and T. Taira, "Laser emission in highly doped Nd:YAG crystals under 4F5/2 and 4F3/2 pumping," Opt. Lett. 26, 1678-1680 (2001)