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Physics of Plasmas / Volume 15 / Issue 3 / ARTICLES / Radiation: Emission, Absorption, Transport

Phys. Plasmas 15, 033301 (2008); http://dx.doi.org/10.1063/1.2888506 (5 pages)

Separation of band-gap overlap in a coaxial Bragg structure operating in higher-order mode at Terahertz frequency

Ying-Xin Lai and Shi-Chang Zhang

Institute of Photoelectronics, Campus Mail Box 50, Southwest Jiaotong University, Chengdu, SC610031, People’s Republic of China

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(Received 20 November 2007; accepted 4 February 2008; published online 14 March 2008)

Band-gap overlap always occurs when an overmoded coaxial Bragg structure operates in the Terahertz frequency spectrum, which may cause serious competition of undesired modes with the operating mode at the operating frequency. In the present paper it is revealed that band-gap overlap of modes can be efficiently separated by setting the phase difference between the outer- and inner-conductor corrugations to be π. Moreover, the residual side-lobes interaction of the involved modes in a coaxial Bragg structure can be entirely eliminated by applying Hamming-window distribution to both the outer-conductor and inner-rod corrugations. These peculiarities provide potential advantage in constructing a coaxial Bragg cavity with high quality factor for single higher-order-mode operation of a high-power free-electron maser in the Terahertz frequency range.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. BAND-GAP OVERLAP IN OVERMODE COAXIAL BRAGG STRUCTURE
  3. A METHOD OF SEPARATING BAND-GAP OVERLAP
  4. ELIMINATION OF RESIDUAL SIDE-LOBES INTERACTION
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

Bragg gratings, energy gap, free electron lasers, masers, submillimetre wave lasers, submillimetre waves

PACS

  • 42.50.Pq

    Cavity quantum electrodynamics; micromasers

  • 41.60.Cr

    Free-electron lasers

  • 42.60.By

    Design of specific laser systems

  • 42.40.Eq

    Holographic optical elements; holographic gratings

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2888506

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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    N. S. Ginzburg, N. Yu. Peskov, A. S. Sergeev, A. D. R. Phelps, A. W. Cross, and I. V. Konoplev, Phys. Plasmas 9, 2798 (2002)PHPAEN000009000006002798000001.

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    Y.-X. Lai and S.-C. Zhang, Phys. Plasmas 14, 113301 (2007)PHPAEN000014000011113301000001.

    Z.-B. Ouyang and S.-C. Zhang, J. Appl. Phys. 102, 074516 (2007)JAPIAU000102000007074516000001.


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