Finite pump-beam-size effects in optical pump-terahertz probe spectroscopy

Georgi L. Dakovski, Brian Kubera, Song Lan, Jie Shan

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Finite pump-beam size in optical pump-terahertz (THz) probe experiments introduces distortions in both the signal amplitude and the spectral form. We show both experimentally and analytically that the pump beam must be 3-4 times larger than the THz probe beam for a one-photon excitation process to achieve <10% spectral distortion. Our experiments use thin samples of single-crystal ZnTe or CdTe. Our model treats the pump-induced change in the THz probe field as radiation from a photoinduced current driven by the THz field. Interpretation of nonideal measurements and relaxation of the requirement on the pump-beam size by introduction of a metallic aperture are also discussed.

Original languageEnglish (US)
Pages (from-to)139-141
Number of pages3
JournalJournal of the Optical Society of America B: Optical Physics
Issue number1
StatePublished - Jan 2006

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics


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