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Pb4.7Ba0.3Ge3O11 Crystals as New Acoustically Induced Nonlinear Optical Materials

A coustically induced optical second harmonic generation (SHG) and two‐photon absorption (TPA) in ferroelectric Pb4.7Ba0.3Ge3O11 crystals have been found. We have found that with increasing acoustical power, the SHG for YAG:Nd laser light (λ=1.06 μm) increases and achieves its maximum value at acous...

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Bibliographic Details
Published in:Crystal research and technology (1979) 2001-07, Vol.36 (6), p.527-533
Main Authors: Zmija, J., Kaddouri, H., Majchrowski, A., Mierczyk, Z., Kityk, I.V.
Format: Article
Language:English
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Summary:A coustically induced optical second harmonic generation (SHG) and two‐photon absorption (TPA) in ferroelectric Pb4.7Ba0.3Ge3O11 crystals have been found. We have found that with increasing acoustical power, the SHG for YAG:Nd laser light (λ=1.06 μm) increases and achieves its maximum value at acoustical power density about 1.75 W/cm2. The evaluated SHG values were 23 % less comparing with χ222 tensor of the KDP single crystals. With decreasing temperature, the acoustically induced SHG signals trongly increases below 29 K. The maximal acoustically induced SHG has been observed at acoustical frequencies lying with in the ranges 12‐17 kHz, 22‐23 kHz and above 26 kHz. This behavior reflects nonlinear superposition of the nonlinear optical susceptibilities stimulated by externallyinduced electron‐phonon anharm onicity. We have observed substantial increase of the TPA (for the acoustical power W=1.8 W/cm2) at high hydrostatic pressures (about 16 GPa) and low temperatures (below 16 K). This one confirms complicated influence of the electron‐phonon interactions in the ferroelectricson the observed nonline aroptical dependences.
ISSN:0232-1300
1521-4079
DOI:10.1002/1521-4079(200107)36:6<527::AID-CRAT527>3.0.CO;2-N