Ultrabroadband Midinfrared Pump-Probe Spectroscopy Using Chirped-Pulse Up-conversion in Gases
Ultrabroadband Midinfrared Pump-Probe Spectroscopy Using Chirped-Pulse Up-conversion in Gases
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DOI：
10.1103/physrevapplied.3.051002
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发表时间：
2015-05-28
影响因子：
4.6
通讯作者：
Fuji, Takao
中科院分区：
文献类型：
--
作者：
Shirai, Hideto;Yeh, Tien-Tien;Fuji, Takao
我们利用四波差频啁啾脉冲上转换技术实现了超宽带、超快的中红外(MIR)泵浦探测光谱。MIR探测脉冲的全光谱从200厘米(-1)扩展到5000厘米(-1)，以单次激发为基础进行记录。我们利用这种MIR泵浦探测光谱测量了本征锗晶片的超快载流子动力学。在远红外到近红外区域，观察到了载流子激发引起的超快反射率变化。用Drude模型解释了反射率变化信号在每个延迟时间的行为。
We demonstrate ultrabroadband and ultrafast midinfrared (MIR) pump-probe spectroscopy by employing the chirped-pulse up-conversion technique with four-wave difference-frequency generation in a gas. The full spectra of the MIR probe pulses, which spread from 200 to 5000 cm(-1), are recorded on a single-shot basis. We apply this MIR pump-probe spectroscopy to measure the ultrafast carrier dynamics of an intrinsic germanium crystal wafer. Ultrafast reflectivity change induced by the excitation of carriers is observed in the region from far to near infrared. The behavior of the reflectivity-change signals at each delay time is explained by the Drude model.