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Direct UV writing of structures in lithium niobate and lithium tantalate

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Figure

Figure 2.2: Structure of LiNbO3 showing both paraelectric and ferroelectric phases [5]
Figure 2.3: Structure of LiNbO3 at room temperature [1].
Figure 4.3: Effect of photorefractive damage on UV written +zwaveguides illuminated with  cut LiNbO3 channel � = 633 nm and fitted with an exponential decay, indicating a lifetime of ~ 62 minutes
Figure 4.15: Comparison of waveguide propagation loss vs. direct UV writing power for +zand -z congruent lithium niobate with a beam velocity of 50 mm/min and spot radius 4 �m
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