This paper presents a novel optical-comb-based refractive index sensor that simultaneously achieves high-sensitivity and high-precision by combining THz-comb-based frequency multiplication with active-dummy temperature compensation in a dual-comb configuration. In this approach, a little RI-induced shift of the comb mode spacing ( frep) is frequency-multiplied via THz frequency comb, while the dual-comb scheme compensates for temperature drift in frep. Experimental results demonstrate a 3100-fold improvement in RI sensitivity and a 10-fold enhancement in measurement precision.
Higaki et al. (Mon,) studied this question.
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