Specific behavior of refractive indices in low-dose He+-implanted LiNbO3 waveguides
2007; American Institute of Physics; Volume: 101; Issue: 9 Linguagem: Inglês
10.1063/1.2716377
ISSN1520-8850
AutoresS. M. Kostritskii, P. Moretti,
Tópico(s)Solid State Laser Technologies
ResumoY - or Z- cut LiNbO3 crystals were implanted at room temperature by helium with energy in the MeV range and various doses with a specific care for the 1010–1016ions∕cm2 range. The induced structure defects were investigated by micro-Raman and IR reflectivity. IR Brewster angle technique was applied for detailed measurements on both indices variations in nuclear collision damaged areas. It is established that a transition from point to extended defects occurs at some threshold dose around 1.5×1015ions∕cm2 and that the extraordinary index is increased in a specific dose range around this threshold. A model based on depolarized cluster formation is proposed to explain the difference observed between the changes of ordinary and extraordinary refractive indices.
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