[20a-E205-1~12] 3.8 Optical measurement, instrumentation, and sensor

△ [20a-E205-3] Time-domain coherent Raman spectroscopy with compressive sensing

〇(M2)Shigekazu Takizawa¹, Kotaro Hiramatsu^1,2, Goda Keisuke^1,3,4 (1.Tokyo Univ., 2.JST PRESTO, 3.UCLA, 4.Wuhan Univ.)

Keywords:Raman spectroscopy, Compressed sensing

Raman spectroscopy enables us to obtain information regarding molecular structures of samples in a label-free manner. However, its signal intensity is weak, so further improvement of the sensitivity is required to measure various samples with high-speed. In this report, we combined time-domain coherent Raman spectroscopy with compressed sensing to improve the sensitivity. Specifically, we used toluene as a model sample and solved the L₁-norm minimization problem with the assumption that the spectrum is sparse. As a result, we demonstrated that a Raman spectrum can be reconstructed from the interferogram that consists of only 220 points, which were extracted from the original interferogram consisting of 3,300 points.