Acoustically induced optical second harmonic generation in Pb4.7Ba0.3Ge3O11 crystals

作者：Kityk IV^*; Zmija J; Majchrowski A; Ebothe J

来源：Journal of Applied Physics, 2003, 93(2): 1160-1164.

DOI：10.1063/1.1530724

Acoustically induced optical second harmonic generation (AIOSHG) in ferroelectric Pb4.7Ba0.3Ge3O11 (PBG) crystal has been observed. With increasing acoustical power, the AIOSHG for Nd doped yttrium-aluminum garnet laser light (lambda=1.06 mum) increases and achieves its maximum value at acoustical power density of about 1.75 W/cm(2). The values of the AIOSHG for the PGB are considerably higher than for other photorefractive ferroelectrics. With decreasing temperature, the AIOSHG signal strongly increases below 29 K and correlates well with a ferroelectric phase transition detected by the differential scanning calorimetric method and spontaneous polarization measurements. The AIOSHG maxima were observed at acoustical frequencies lying within the ranges 12-17, 22 to 23, and above 26 kHz. Comparing the obtained results with the acoustically induced Raman spectra at different temperatures one can conclude that the effect is caused prevailingly by acoustically induced electron-phonon anharmonicity, which is larger in the vicinity of the ferroelectric phase transition.

• 出版日期2003-1-15