Neodymium-doped gadolinium orthophosphate (GdPO 4 :Nd 3+) luminomagnetic sub-micron-stars were prepared by solvothermal method using metal nitrates and phosphoric acid. Monoclinic star shaped in six lobed sub-micron-stars with 600 nm length is obtained with uniform particle size distribution. After heat-treatment at 800°C for 1 hour in air, the stars separate into isolated petal shaped particles and show characteristic emission bands of Nd 3+ with the strongest emission at 1064 nm. The emission intensities and fluorescence decay times are dependent on the Nd 3+ concentration with the highest emission intensity and longest fluorescence decay time of 311 µs at 1064 nm with 0.5 mol% Nd 3+. Under 808 nm excitation with 12 W/cm 2 power density a quantum yield of 9% was obtained for the 1.0 mol% Nd 3+. The presence of paramagnetic Gd 3+ givesmagnetic properties to the phosphorwith a calculated magnetic moment of 1,510 and 107,965 Bohr magneton at 300 and 5 K, respectively.

Optical damage experiments were carried out in a series of Holmium doped congruent lithium niobate (Ho:cLN) crystals as a function of dopant concentration and laser intensity. The light induced beam distortion was recorded with a camera and a detector under the pseudo-Z-scan configuration. At 532 nm, strong suppression of the optical damage was observed for the 0.94 mol. % doped crystal. Increased resistance to optical damage was also observed at 488 nm. The suppression of the optical damage is predominantly attributed to the reduction of the Nb antisites due to the holmium doping.