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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry van Driel
  • Vol. 29, Iss. 6 — Jun. 1, 2012
  • pp: 1436–1442

Characterization of spectrally broadband terahertz beam propagation

Assaf Bitman, Yaakov Lumer, Inon Moshe, and Zeev Zalevsky  »View Author Affiliations

JOSA B, Vol. 29, Issue 6, pp. 1436-1442 (2012)

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We present a new approach to defining the “beam quality” of a broadband terahertz beam as it propagates through a first-order optical system. A new definition to beam variance is exhibited, taking into account the spectral weight function of the beam. The near-field far-field propagation product is presented by the general averaged M2, marked as (M¯Broadband)2. This parameter is invariant while the beam propagates through optical systems, and it obeys the rule of (M¯Broadband)21. Moreover, we show that, in the special case of monochromatic radiation, the definitions we made are reduced to the known expressions of single frequency radiation. We demonstrate a practical procedure for measuring the beam quality of a broadband radiation. The importance of this procedure is emphasized by our experimental results.

© 2012 Optical Society of America

OCIS Codes
(140.3295) Lasers and laser optics : Laser beam characterization
(110.6795) Imaging systems : Terahertz imaging
(070.7345) Fourier optics and signal processing : Wave propagation

ToC Category:
Physical Optics

Original Manuscript: September 22, 2011
Revised Manuscript: January 23, 2012
Manuscript Accepted: March 8, 2012
Published: May 29, 2012

Assaf Bitman, Yaakov Lumer, Inon Moshe, and Zeev Zalevsky, "Characterization of spectrally broadband terahertz beam propagation," J. Opt. Soc. Am. B 29, 1436-1442 (2012)

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