We fabricated a low-loss TM-pass polariser at λ = 1.32 μm integrated with low-loss titanium waveguides in Z-cut LiNbO3. The polariser, fabricated by proton exchange, had an excess insertion loss of 0.3 dB and a polarisation extinction ratio of > 40dB.
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Veselka et al. (1987) studied this question.
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