[16a-K305-1~8] 3.13 Silicon photonics, Photonics-electronics convergence, Optical control

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)

[16a-K305-3] Enhanced Sensitivity of Optical Waveguide Cavity Ring-Down System Using Log-amplifier

〇(B)Kenta Ohkawachi¹, Haisong Jiang^1,2, Kiichi Hamamoto^1,2 (1.Department of Interdisciplinary Engineering, School of Engineering, Kyushu University, 2.Interdisciplinary Graduate School of Engineering Sciences (I-EggS) Kyushu University)

Keywords:

Cavity ring-down spectroscopy,Optical waveguide,Breath sensing

We are researching and developing a compact breathalyzer sensing system based on cavity ring-down spectroscopy (CRDS) utilizing an optical waveguide. To enhance the sensitivity of the system, we investigated the application of a logarithmic amplifier. Our results indicate a significant reduction in the lower detection limit and an approximately 20 times improvement in ring-down time. This enhancement effectively corresponds to a substantial increase in the effective cavity length within the CRDS, leading to an overall sensitivity improvement by a factor of approximately 20.