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Optics Letters

Optics Letters


  • Vol. 24, Iss. 20 — Oct. 15, 1999
  • pp: 1431–1433

Propagation of ultrawideband short pulses of terahertz radiation through submillimeter-diameter circular waveguides

R. W. McGowan, G. Gallot, and D. Grischkowsky  »View Author Affiliations

Optics Letters, Vol. 24, Issue 20, pp. 1431-1433 (1999)

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We report experimental investigations in which quasi-optical methods were used to efficiently couple freely propagating, optoelectronically generated, subpicosecond pulses of terahertz (THz) radiation into submillimeter circular metal tubes (waveguides) and, consequently, to measure the transmitted pulses from these waveguides. We observe very dispersive low-loss propagation over the frequency band from 0.65 to 3.5 THz, with frequency-dependent group velocities νg ranging from c/4 to c and phase velocities νp from 4c to c , where νgνp=c2 . The linearly polarized incoming THz pulses couple significantly only into the TE11 , TM11 , and TE12 modes of the utilized 24- and 4-mm-long stainless-steel tubes, with inside diameters of 240 and 280µm , respectively.

© 1999 Optical Society of America

OCIS Codes
(230.7370) Optical devices : Waveguides
(320.5390) Ultrafast optics : Picosecond phenomena
(350.4010) Other areas of optics : Microwaves

R. W. McGowan, G. Gallot, and D. Grischkowsky, "Propagation of ultrawideband short pulses of terahertz radiation through submillimeter-diameter circular waveguides," Opt. Lett. 24, 1431-1433 (1999)

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