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BIREFRINGENCE GRATING WITHIN A SINGLE MODE POLYMER OPTICAL FIBRE WITH PHOTOSENSITIVE CORE OF AZOBENZENE COPOLYMER

Z. Li1,* , H. Ma2, Q. Zhang1, H. Ming2

Affiliation

  1. Structure Research Laboratory, Department of Polymer Science and Engineering, University of Science and Technology of China Hefei, Anhui, 230026, P. R. China
  2. Department of Physics University of Science and Technology of China Hefei, Anhui, 230026, P. R. China

Abstract

A single mode optical fibre with a core of azobenzene-containing copolymer instead of doped polymer was fabricated. A 120 m long-period birefringence grating with a 50% duty cycle has been successfully written within the core of the fibre with 532 nm laser by a mask method. Under polarized microphotography, the grating was observed when the optical axis was set at 45° with the direction of the first polarizing lens of the polarization microscope. Although birefringence decayed gradually when writing laser was turned off, a permanent change of refractive index as much as 7.0 10-4 still has been observed in the material, which ensures the stability of written birefringence grating..

Keywords

Photosensitive POF, Single mode POF, Birefringence grating, Azobenzene copolymer.

Submitted at: Nov. 26, 2004
Accepted at: March 23, 2005

Citation

Z. Li, H. Ma, Q. Zhang, H. Ming, BIREFRINGENCE GRATING WITHIN A SINGLE MODE POLYMER OPTICAL FIBRE WITH PHOTOSENSITIVE CORE OF AZOBENZENE COPOLYMER, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 2, pp. 1039-1046 (2005)