High-brightness terahertz beams characterized with an ultrafast detector

  • Martin van Exter
    IBM Watson Research Center, P. O. Box 218, Yorktown Heights, New York 10598
  • Ch. Fattinger
    IBM Watson Research Center, P. O. Box 218, Yorktown Heights, New York 10598
  • D. Grischkowsky
    IBM Watson Research Center, P. O. Box 218, Yorktown Heights, New York 10598

書誌事項

公開日
1989-07-24
DOI
  • 10.1063/1.101901
公開者
AIP Publishing

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説明

<jats:p>We have significantly improved the emission and detection of electromagnetic beams of single-cycle 0.5 THz pulses, through the use of new dipolar antenna structures. The frequency response was extended to well beyond 1 THz, and the beam power was increased by more than 15 times. The antennas were located at the foci of sapphire lenses and were photoconductively driven by ultrafast laser pulses. An additional collimation by a paraboloidal mirror produced a beam with a 25 mrad divergence, and subsequent focusing by a second identical mirror improved the coupling between the transmitting and receiving antenna by orders of magnitude.</jats:p>

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