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(a) Energy-level scheme of the DS-CARS process under spectral focusing mechanism. (b) Principle of the spectral focusing and DS-CARS in the time-frequency plane. Note that there is only one pump that is scanned in time from soliton 1 all the way to soliton 2. τ0 is the temporal walk-off of the dual-soliton pulses; τ1 is the delay interval.
