A nonlinear optical polymer, which is thermoreversibly crosslinkable (see Figure), has been developed to overcome the nonlinearity–stability trade-off in poled polymers. High poling efficiency has been achieved after controlled, mild lattice hardening via the Diels–Alder crosslinking reaction. The resulting material exhibits a large electro-optic coefficient (r33 = 76 pm V–1 at 1.3 μm) and excellent temporal stability.
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