[22p-A602-1~17] 3.7 Optical measurement, instrumentation, and sensor (formerly 3.8)

1:45 PM - 2:00 PM JST(4:45 AM - 5:00 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[22p-A602-4] Enhanced sensitivity of refractive-index-sensing optical combby frequency multiplication based on THz comb

〇Masayuki Higaki¹, Shogo Miyamura¹, Shuji Taue², Yu Tokizane³, Eiji Hase³, Takeo Minamikawa³, Takeshi Yasui³ (1.Grad. Sch. Sci. Tech. Innov., Tokushima Univ., 2.Koch Univ. Tech., 3.pLED, Tokushima Univ)

Keywords:

Optical Frequency Comb,Sensing Optical Comb,THz Comb

Refractive index sensing optical comb, which incorporates an MMI fiber sensor inside a fiber optical comb resonator and reads it out as an electrical frequency signal (repetition frequency frep), can measure the refractive index with high accuracy. However, since the refractive index-dependent frep shift is minute, ranging from tens to hundreds of Hz, amplification of this frequency change is required. In this talk, we report a method for frequency multiplication of the frep shift by detecting the beat signal of a CW-THz light source and a frep higher-order harmonic (THz comb) expanded up to the THz band.