Study of poling condition in 2 mole% MgO-doped $LiNbO_3$ using second harmonic generation

제2고조파 발생특성을 통한 MgO가 2 mole% 첨가된 $LiNbO_3$ 단결정의 poling 조건연구

  • 이종수 (서강대학교 물리학과) ;
  • 이범구 (서강대학교 물리학과) ;
  • 주기태 (한국과학기술연구원 세라믹스부)
  • Published : 1997.10.01


Poling condition in 2 mol% MgO-doped $LiNbO_3$ crystals is investigated by varying the amplitude of poling electric field from 3V/cm to 7V/cm. It is found that 5V/cm is the best value for the formation of single domain by analysing the characteristics of the second harmonic generation(SHG) as the function of temperature. The temperature dependence of the phase-matching profile of SHG for the crystal applied by a spatially modulated electric field is observed to be very different from the simple sinc function. The distorted profile can be consistently fitted with the numerical simulations. This shows that the crystal homogeneity can be tested by the SHG temperature phase-matching profile. In addition, the thermo birefringence coefficient and electro birefringence coefficient of SHG were measured from the temperature dependence of phase-matching profile and shifts of phase-matching temperature by appling electric field along c-axis.



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