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Second-harmonic generation in periodically poled lithium niobate waveguides fabricated by femtosecond laser pulses

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12 Author(s)
Lee, Y.L. ; Nonlinear Optics Laboratory, Advanced Photonics Research Institute, GIST, Gwangju 500-712, Republic of Korea ; Yu, N.E. ; Jung, C. ; Yu, B.-A.
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The authors have demonstrated the second-harmonic generation (SHG) in optical channel waveguides which were fabricated in periodically poled lithium niobate (PPLN) by tightly focused femtosecond laser (781 nm) pulses. The measured quasi-phase-matched wavelength and 3 dB bandwidth for SHG in a 44.8-mm-long PPLN waveguide which has a domain period of 16.6 μm were about 1563 and 0.25 nm, respectively. The value of the index difference between the fundamental and harmonic wavelengths in laser written waveguide was inferred to be 0.047.

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Applied Physics Letters  (Volume:89 ,  Issue: 17 )