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Optics Letters

Optics Letters


  • Vol. 25, Iss. 16 — Aug. 15, 2000
  • pp: 1210–1212

Intense terahertz pulses by four-wave rectification in air

D. J. Cook and R. M. Hochstrasser  »View Author Affiliations

Optics Letters, Vol. 25, Issue 16, pp. 1210-1212 (2000)

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We describe a new four-wave rectification method for the generation of intense, ultrafast terahertz (THz) pulses from gases. The fundamental and second-harmonic output of an amplified Ti:sapphire laser is focused to a peak intensity of ~5×1014W/cm 2 . Under these conditions, peak THz fields estimated at 2 kV/cm have been observed; the measured power spectrum peaks near 2 THz. Phase-dependent measurements show that this is a coherent process and is sensitive to the relative phases of the fundamental and second-harmonic pulses. Comparable THz signals have been observed from nitrogen and argon as well as from air.

© 2000 Optical Society of America

OCIS Codes
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(260.3090) Physical optics : Infrared, far
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(320.7160) Ultrafast optics : Ultrafast technology

D. J. Cook and R. M. Hochstrasser, "Intense terahertz pulses by four-wave rectification in air," Opt. Lett. 25, 1210-1212 (2000)

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