Schedule 2 2:15 PM - 2:30 PM [ALPS-5-03] Rapid Characterization of Orbital Angular Momentum Spectrum of Arbitrary Optical Vortex using Dual-comb Spectroscopy *Akifumi Asahara1,2, Takuto Adachi1, Yue Wang1,2, Kaoru Minoshima1,2 (1. The University of Electro-Communications, 2. JST, ERATO MINOSHIMA Intelligent Optical Synthesizer)