芝浦工業大学との共同研究の成果が Electronics Letters に掲載されました。

反射率可変ミラーを用いたブリルアン観測系を提案し、その特異な偏波依存性を解明した論文が、Electronics Letters に掲載されました。芝浦工業大学の李准教授と捧君（M2）が中心となって進めた共同研究の成果です。

H. Sasage, K. Nakamura, Y. Mizuno, and H. Lee, “Simplified setup for Brillouin scattering observation using variable reflectivity mirror and its polarisation characteristics,” Electron. Lett., vol. 59, no. 24, e13053 (2023).

We present a streamlined setup for Brillouin scattering observation, which negates the need for an independent reference path by incorporating a variable reflectivity mirror at the terminus of the sensing fibre. Our study uncovers an optimal reflectivity point, specifically at -9 dB, where the signal-to-noise ratio (SNR) of the observed Brillouin gain spectrum reaches its zenith, approximately doubling the SNR of a conventional simplified setup that utilises Fresnel reflection. Furthermore, we elucidate that this setup inherently mitigates the polarisation-dependent fluctuations of the Brillouin gain spectrum.