A LiNbO3 crystal with periodic laminar ferroelectric domain structures (460 domains) was used to generate 430 and 435 nm radiation by quasi-phase-matched frequency doubling at room temperature. Blue light output of 0.2 μJ energy was measured for input energy 5 μJ of fundamental wave in pulse operation.
Picosecond 531 nm green and 385 nm violet light generation through first-order and third-order quasiphase matching (QPM) has been performed in a LiNbO3 optical superlattice. The conversion efficiency is 11.4% and 1.6%, respectively. A comparison between theoretical analyses and experimental results of frequency doubling peak value and full width at half-maximum for both the first- and third-order QPM are given. Possible simultaneous generation of green and violet light in the crystal are predicted for constructing a compact two outputting wavelengths light source.
A third-order quasi-phase-matched LiNbO(3) crystal was used to double the output of an 810-nm cw GaAlAs diode laser directly. A blue-light output power of 0.35 mW was measured with a conversion efficiency of 0.13%.
By using growth striation technique, an acoustic superlattice of barium sodium niobate crystals, the single crystals with the periodic laminar ferroelectric domain structures, has been prepared. High-frequency resonance in the range of 200–400 MHz in such materials has been realized experimentally. The experimental results indicate that the application of acoustic devices with low acoustic loss operating at high frequencies is expected.
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