Bulk Phase-Matched Second-Harmonic Generation in Drawn and Poled Polymers
Phase-matched second-harmonic generation (SHG) has been realized from a drawn and poled main-chain polyurea (PU) by end-fire coupling at the fundamental wavelength of 1.064 μm. The PU was synthesized from 4,4’-diphenylmethane diisocyanate and 4,4’-methylene bis(cyclohexylamine). The free-standing films were drawn and poled simultaneously by zone drawing and poling apparatus developed by ourself. By drawing, the birefringence between the in-plane and in the film normal directions can be controlled and such kind birefringence can be used for phase matching just like in biaxial single crystals. The type I phase-matching was realized in experiments. By this method, phase-matching at a number of interested wavelengths can be realized. Moreover, noncritical phase-matching in poled polymers at certain draw ratio is also possible.
KeywordsDraw Ratio Film Plane Second Harmonic Pole Polymer Diphen Ylmethane Diisocyanate
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