[Table of Contents]

Plasma and Fusion Research

Volume 2, S1020 (2007)

Regular Articles

Spectroscopy and Imaging by Laser Excited Terahertz Waves
Masanori HANGYO, Masahiko TANI, Takeshi NAGASHIMA, Hideaki KITAHARA and Hisashi SUMIKURA
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
(Received 13 December 2006 / Accepted 3 March 2007 / Published 20 November 2007)

Abstract

Recently, the technology of generating and detecting terahertz (THz) waves by using ultrashort pulse lasers has made great progress. In this paper, we describe THz spectroscopies and imaging with the intention of applying them to diagnostics of plasmas in the future. After a brief description of the method of generating and detecting THz pulses with a femtosecond laser, the principle of THz time-domain spectroscopy is described. The THz magneto-optical effect measurement system up to the magnetic field of 10 T and down to 5 K is also shown. These systems are used to characterize solid state plasmas in semiconductors. The transmission- and reflection-type imaging systems are described and some examples of measurements are shown. Finally, the application of the THz technology to fusion plasma diagnostics is proposed.

Keywords

terahertz (THz) wave, terahertz time-domain spectroscopy (THz-TDS), femtosecond laser, plasma, imaging, tomography

DOI: 10.1585/pfr.2.S1020

Full Text

PDF format (1.4Mbytes) PDF Download

References

  • [1] D.H. Auston, K.P. Cheung and P.R. Smith, Appl. Phys. Lett. 45, 284 (1984).
  • [2] Sensing with Terahertz Radiation, edited by D. Mittleman (Springer, Berlin, 2003).
  • [3] Terahertz Optoelectronics, edited by K. Sakai (Springer, Berlin, 2005).
  • [4] S.P. Jamison et al., J. Appl. Phys. 93, 4334 (2003).
  • [5] B.H. Kolner et al., Appl. Phys. Lett. 87, 151501 (2005).
  • [6] S. Ebbinghaus et al., Plasma Sources Sci. Technol. 15, 72 (2006).
  • [7] M. Hangyo, T. Nagashima and S. Nashima, Meas. Sci. Technol. 13, 1727 (2002).
  • [8] M. Hangyo, M. Tani and T. Nagashima, Int. J. Infrared and Millimeter Waves 26, 1661 (2005).
  • [9] S. Nashima et al., J. Appl. Phys. 90, 837 (2001).
  • [10] M. van Exter and D. Grischkowsky, Phys. Rev. B 41, 12140 (1990).
  • [11] O. Morikawa et al., J. Appl. Phys. 100, 033105 (2006).
  • [12] H. Sumikura et al., Jpn. J. Appl. Phys. 46 A,1739 (2007).
  • [13] M. van Exter, Ch. Fattinger and D. Grischkowsky, Opt. Lett. 14, 1128 (1989).
  • [14] H. Harde, S. Keiding and D. Grischkowsky, Phys. Rev. Lett. 66, 1834 (1991).
  • [15] B.B. Hu and M.C. Nuss, Opt. Lett. 20, 1716 (1995).
  • [16] B. Feruguson and X.-C. Zhang, Nature Materials 1, 26 (2002).
  • [17] K. Yamamoto et al., Jpn. J. Appl. Phys. 43, L414 (2004).
  • [18] Q. Wu, T.D. Hewitt and X.-C. Zhang, Appl. Phys. Lett. 69, 1026 (1996).
  • [19] F. Miyamaru et al., Jpn. J. Appl. Phys. 43, L489 (2004).
  • [20] D.M. Mittleman et al., Opt. Lett. 22, 904 (1997).
  • [21] G. Vayakis et al., Nucl. Fusion 46, S836 (2006).
  • [22] T. Tokuzawa et al., in Abstracts of the 16th Int. Toki Conf. (NIFS, Toki, 2006) P5-18, 86.

This paper may be cited as follows:

Masanori HANGYO, Masahiko TANI, Takeshi NAGASHIMA, Hideaki KITAHARA and Hisashi SUMIKURA, Plasma Fusion Res. 2, S1020 (2007).