Ultrabroadband Midinfrared Pump-Probe Spectroscopy Using Chirped-Pulse Up-conversion in Gases

Hideto Shirai, Tien Tien Yeh, Yutaka Nomura, Chih-Wei Luo, Takao Fuji

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

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.

Original languageEnglish
Article number051002
Number of pages5
JournalPhysical Review Applied
Volume3
Issue number5
DOIs
StatePublished - 28 May 2015

Keywords

  • VIBRATIONAL-RELAXATION
  • INFRARED-SPECTROSCOPY
  • GENERATION
  • FILAMENTATION
  • FREQUENCY
  • CONTINUUM
  • REFLECTIVITY
  • CARRIERS
  • SPECTRA
  • PROTEIN

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