[26a-E201-1~12] 10.2 スピン基盤技術・萌芽的デバイス技術

△ [26a-E201-1] Ultrafast time-resolved spectroscopy of spin precession by asynchronous optical sampling measurement using dual frequency comb

〇(D)西川 大智¹、岡野 真人^1,2、渡邉 紳一¹ (1.慶大理工、2.防衛大)

キーワード：スピン歳差運動、デュアルコム、非同期サンプリング

Time-resolved spectrocopy of the dynamics of photo-excited spin precession on a ferromagnetic metal NiFe surface were performed. A dual-comb light source consisting of two optical frequency comb light sources was used for the experiments.By controlling the timing of the pulse oscillation of each light source with precise frequency stabilization, a time difference was automatically generated between the pump and probe light pulses, and pump-probe spectroscopy with non-mechanical time sweep was realized. In other words, we have constructed an asynchronous sampling measurement system. In this way, the measurement time of the optical pump-probe method was shortened and the time and frequency resolutions were improved. We succeeded in observing photo-excited spin precession and ultrafast demagnetization.