We report for the first time a non-linear optical polymer exhibiting optical transparency down to 307 nm. From the Maker fringe measurements, the non-linear optical d33 coefficient of poled aromatic polyurea films was found to be 14 times that of potassium dihydrogen phosphate (KDP) at 1.064 #m fundamental radiation. Aromatic polyurea forms flexible, colourless and transparent films and thermogravimetric analysis showed high thermal stability. The non-linear efficiency and optical transparency make aromatic polyurea a potentially useful material for non-linear optics.
Посилання на статтю:
N-Phenylated aromatic polyurea: a new non-linear optical material exhibiting large second harmonic generation and u.v. transparency / Hari Singh Nalwa*, Tokiyuki Watanabe Atsushi Kakuta, Akio Mukoh andSeizo Miyata // Polymer. – 1993. – Vol 34. – P. 657-659.