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By combining a tilted-pulse-intensity-front scheme using a LiNbO3 crystal anda chirped-pulse-beating method, we generated a narrowband intense terahertz(THz) pulse, which had a maximum electric field of more than 10 kV/cm at around2 THz, a bandwidth of about 50 GHz,and frequency tunability from 0.5 to 2 THz.By performing THz-pump and near-infrared-probe experiments on GaAs quantumwells, we observed that the resonant excitation of the intraexcitonic 1s-2ptransition induces a clear and large Autler-Townes splitting. Our time-resolvedmeasurements show that the splitting energy observed in the rising edge regionof electric field is larger than in the constant region. This result impliesthat the splitting energy depends on the time-averaged THz field over theexcitonic dephasing time rather than that at the instant of the excitoncreation by a probe pulse.

Time-resolved observation of coherent excitonic nonlinear response with a table-top narrowband THz pulse wave