Laser annealing via preexposure to laser pulses at sub-damage-threshold fluences is known to improve the resistance of KDP crystals to laser-induced damage. Using a specific damage-testing method, we investigate the laser annealing process as a function of fluence and number of preexposure pulses (at 355 nm, 2.5 ns). Our aim is to reveal the key laser parameters in order to devise a practical and efficient protocol for optimizing performance of the material for operation in laser systems in the near UV. Results suggest that a near twofold improvement to the laser-damage performance can be achieved with a limited number of preexposure pulses.
© 2005 Optical Society of America
R. A. Negres, P. DeMange, and S. G. Demos, "Investigation of laser annealing parameters for optimal laser-damage performance in deuterated potassium dihydrogen phosphate," Opt. Lett. 30, 2766-2768 (2005)