Abstract
Quasiphase-matching second-harmonic-generation experiments have been performed on the Nd3+-doped strontium barium niobate multiself-frequency-converter nonlinear crystals. Optical microscopy has been used to determine the size dispersion of cylindrical ferroelectric domains appearing in as-grown crystals. A broad distribution of domain sizes (ranging between 1.5 and 8 μm) has been obtained. This gives the possibility of broadband second-harmonic generation in the 800–1200 nm range. The dependence of second-harmonic efficiency on crystal temperature has been found to be correlated with the thermal behavior of the spontaneous polarization, so that second-harmonic efficiency is almost temperature independent in the 25–50 °C range.
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