Origins of waveguiding in femtosecond laser-structured LiNbO3
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- Burghoff, J., Nolte, S. & Tünnermann, A. Appl. Phys. A (2007) 89: 127. doi:10.1007/s00339-007-4152-0
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Femtosecond laser-induced structural changes in LiNbO3 are studied. Depending on the laser processing parameters two different types of modification are identified and their origin is discussed. Both types of modification can be described within the framework of induced lattice defects. For strong material damage a refractive index increase can be obtained due to the induced stress field. By appropriate tailoring of this stress field thermally stable and highly symmetric waveguides can be obtained well suited for nonlinear integrated-optical applications.