Abstract
The interaction of single femtosecond laser pulses tightly focused in the bulk of LiNbO3 doped with Fe (400 ppm doping) and LiTaO3 crystals was recently studied [1,2]. Single shots of 150 fs, 800 nm laser pulses, 3–50 nJ per pulse, were focused inside a crystal to the depth of 50 microns to the focal spot with diameter of 1.8 μm; the intensity in the interaction region varied from 1.0 TW/cm2 to 16.7 TW/cm2. The threshold for optically detectable change of refractive index has been found to be 3.8±0.5 nJ in Fe: LiNbO3 and 5.2±0.5 nJ in pure LiNbO3 crystal (intensity TW/cm2 and 1.37 TW/cm2 respectively). The permanent modification of LiTaO3 was observed at 32±5 nJ (~10 TW/cm2) that might be considered as a result of breakdown. It has been found that the laser-induced material transformation is fully reversible at the energy per pulse of 14.5 nJ (3.8 TW/cm2).
© 2009 IEEE
PDF ArticleMore Like This
Dominik Maxein, Johanna Bückers, Daniel Haertle, and Karsten Buse
CC_P6 The European Conference on Lasers and Electro-Optics (CLEO/Europe) 2009
S. Juodkazis, E. G. Gamaly, V Mizeikis, H. Misawa, A. V Rode, and W Z. Krolikowski
CC1_5 The European Conference on Lasers and Electro-Optics (CLEO/Europe) 2007
Shane M. Eaton, Mi Li Ng, Tariq Rafique, and Peter R. Herman
CFT3 Conference on Lasers and Electro-Optics (CLEO:S&I) 2009