[11a-C212-1~12] 3.7 Optical measurement, instrumentation, and sensor

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[11a-C212-3] Distance Measurement Using Optical Terahertz Waves Generated from a Low-Coherence Light Source

〇Sota Murakami¹, Mao Nakamura¹, Shu Wakabayashi¹, Tatsutoshi Shioda¹ (1.Saitama Univ.)

Keywords:

optical measurement technology

We investigated distance measurement using optical terahertz waves generated from a low-coherence light source. In conventional two-wavelength simultaneous heterodyne distance measurement, two wavelengths are generated using a laser source and an optical frequency comb, which can make the system large and costly and limit selectable frequency spacing. In this study, two frequency components were extracted from an ASE source using an etalon filter and a band-pass filter. The optical path length difference in the signal arm was swept by a delay line over 6 mm in 0.1 mm steps, and the corresponding DC voltage was measured. The result showed a nearly linear relationship between applied and measured OPD, confirming that distance measurement is feasible even with a low-coherence light source.