Optical properties of a waveguide written inside a LiTaO3 crystal by irradiation with focused femtosecond laser pulses
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- Kumatoriya, M., Nakabayashi, M., Sakakura, M. et al. OPT REV (2011) 18: 166. doi:10.1007/s10043-011-0017-z
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Optical waveguides were fabricated by modifying the optical properties inside a LiTaO3 crystal by irradiation with femtosecond laser pulses, and the performance and optical properties of the waveguide were investigated. On the basis of near-field pattern of the light guided through the waveguides, the optimum writing conditions such as the pulse energy and the pulse duration were determined. The waveguide written inside a LiTaO3 crystal had a strong polarization dependence of guided light. Observation by a polarized microscope suggested that the stress distribution around the photoexcited region should be responsible for the polarization dependence of guided light. In addition, the second harmonic generation from a laser beam passing through the waveguide was observed, which suggests that the ferroelectric properties of LiTaO3 were preserved after the photoexcitation.