Abstract
We report a novel measurement method, referred to as the multiple pulse train interference (MPTI)-based method, to measure the refractive index of air using a femtosecond optical frequency comb. The temperature change around the region of interest is recorded based on the interference of multiple pulse trains, and this change is reflected as the distance between MPTI fringes via the use of the conventional Fourier transformation method. The proposed method is demonstrated using a sealed 600-mm cell containing a given volume of water. The results of this preliminary experiment reveal the potential of the MPTI method towards obtaining a high-accuracy evaluation of the refractive index of air.
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