DOI: https://doi.org/10.14710/jpa.v1i2.4659

Concurrent measurement of sample and reference waveforms in an optical-pump terahertz-probe system using a controlled optical diaphragm shutter

*Jessica Afalla  -  Research Center for Development of Far Infrared Region, University of Fukui, Japan
Hideaki Kitahara  -  Research Center for Development of Far Infrared Region, University of Fukui, Japan
Takeshi Moriyasu  -  School of Engineering, University of Fukui, Japan
Masahiko Tani  -  Research Center for Development of Far Infrared Region, University of Fukui, Japan
Received: 9 Apr 2019; Accepted: 16 May 2019; Available online: 31 May 2019; Published: 20 Jun 2019.

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Abstract

We present concurrent measurement of sample and reference terahertz waveforms for an optical-pump terahertz-probe spectrometer, using a controlled optical diaphragm shutter for the optical pump line. When waveforms are taken consecutively, laser power fluctuations and other experimental conditions can introduce spectral artefacts, thus a concurrent measurement is preferred. Instead of techniques based on double modulation, the use of the diaphragm shutter eliminates the need for a second lock-in amplifier and/or constricted alignment due to the use of a single chopper blade for modulating two signals, simultaneously. Drude fitting of the complex conductivity obtained for GaAs confirms that measurements obtained using our set-up agree with reported scattering times.

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Keywords: terahertz; instrumentation; pump and probe; spectroscopy;

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  8. R. E. III Glover and M. Tinkham, Conductivity of Superconducting Films for Photon energies between 0.3 and 40kTc,” Phys. Rev. 108 243 (1957)
  9. I-. C. Ho and X-. C. Zhang, “Application of broadband terahertz spectroscopy in semiconductor nonlinear dynamics,” Front. Optolectron. 7 220 (2014)
  10. Q. Wu and X-. C. Zhang, “Ultrafast electro-optic field sensors,” Appl. Phys. Lett. 68 1604 (1996)
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  12. K. Iwaszczuk, D. G. Cooke, M. Fujiwara, H. Hashimoto and P. U. Jepsen, “Simultaneous references and differential waveform acquisition in time-resolved terahertz spectroscopy,” Optics Express 17 21969 (2009)
  13. P. D. Cunningham “Accessing Terahertz Complex Conductivity Dynamics in the Time-Domain,” IEEE Trans. Terahertz Sci. Technol. 3 494 (2013)
  14. F. A. Hegmann, R. R. Tykwinski, K. P. H. Lui, J. E. Bullock and J. E. Anthony, “Picosecond Transient Photoconductivity in Functionalized Pentacene Molecular Crystals Probed by Terahertz Pulse Spectroscopy,” Phys. Rev. Lett. 89 227403 (2002)
  15. N. V. Smith, “Classical generalization of the Drude formula for the optical conductivity,” Phys. Rev. B 64 155106 (2001)
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