Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Poling Quality Enhancement of PPLN Devices Using Negative Multiple Pulse Poling Method

  • Choi, Ju-Won (Graduate Program of Photonics and Applied Physics, Gwangju Institute of Science and Technology) ;
  • Ro, Jung-Hoon (Department of Biomedical Engineering School of Medicine, Pusan National University) ;
  • Ko, Do-Kyeong (Graduate Program of Photonics and Applied Physics, Gwangju Institute of Science and Technology) ;
  • Yu, Nan-Ei (Advanced Photonics Research Institute, Gwangju Institute of Science and Technology)
  • Received : 2011.01.31
  • Accepted : 2011.04.19
  • Published : 2011.06.25
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Abstract

A poling method using multiple negative voltage was introduced to fabricate periodically poled lithium niobate (PPLN) devices with quasi-phase matching (QPM) period of $12.9\;{\mu}m$ by utilizing an real-time visualization system. We also performed variation of the electric field during the poling. Two different conventionally used poling method, negative and positive single pulses, were used and the poling quality compared through microscopic images and far-field diffraction pattern analysis. Etched images on the +z and -z surfaces of PPLN showed that negative multiple pulse poling presented the highest periodicity in domain structures among the three methods. Duty ratio and its standard deviation were measured by analyzing far-field diffraction patterns. The newly introduced method of negative multiple pulse poling had duty ratio of 0.42 which was close to the ideal value of 0.50 and standard deviation of 0.020 that was about 3 times smaller than that of the other conventional methods.

Keywords

References

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