プラスチック光ファイバ中のフレネル反射低減手法に関する松谷（M1）の論文が Japanese Journal of Applied Physics に掲載されました。
N. Matsutani, H. Lee, Y. Mizuno, and K. Nakamura, “Long-term stability enhancement of Brillouin measurement in polymer optical fibers using amorphous fluoropolymer,” Jpn. J. Appl. Phys., vol. 57, no. 1, 018001 (2018).
For Brillouin-sensing applications, we develop a method for mitigating the Fresnel reflection at the perfluorinated-polymer-optical-fiber ends by covering them with an amorphous fluoropolymer (CYTOP, fiber core material) dissolved in a volatile solvent. Unlike the conventional method using water, even after solvent evaporation, the CYTOP layer remains, resulting in long-term Fresnel reduction. In addition, the high viscosity of the CYTOP solution is a practical advantage. The effectiveness of this method is experimentally proved by Brillouin measurement.