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We demonstrated CW SHG at 400 nm in a first-order QPM adhered slab waveguide with a periodically-poled Mg-doped stoichiometric lithium tantalate core. The measured SHG normalized conversion efficiency was 34.7%/W for a 20 mm length.
We derived an expression for the noise between the diffraction orders from a random grating. The result was applied to analyze the statistical duty-cycle error in PPLN, providing an efficient means for poling quality evaluation.
We demonstrate an efficient far-field diffraction method for quality assessment of periodically poled lithium niobate crystals. Microscopic and macroscopic analyses are carried out to obtain important statistical quantities and to assess the final device performance.
We demonstrate that the nonlinear optical performance of periodically poled crystals can be exactly predicted by observing the far-field diffraction pattern. The diffraction pattern is shown to be equivalent to the second-harmonic generation tuning curve.
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