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Related Experiment Videos

Antenna model for wire lasers.

E E Orlova1, J N Hovenier, T O Klaassen

  • 1Institute for Physics of Microstructures, Russian Academy of Sciences, Nishny Novgorod GSP-105. orlova@ipm.sci-nnov.ru

Physical Review Letters
|May 23, 2006
PubMed
Summary
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A new antenna model explains the directional radiation of long wire lasers. This model accurately predicts a narrow beam for terahertz quantum cascade wire lasers, matching experimental findings.

Area of Science:

  • Optics and Photonics
  • Antenna Theory
  • Quantum Cascade Lasers

Background:

  • Subwavelength lasers, or wire lasers, present unique challenges in understanding their radiation patterns due to their small cross-sections.
  • The far-field characteristics of such lasers are not well-established, particularly for long devices where length significantly exceeds the cross-sectional dimensions.

Purpose of the Study:

  • To develop and validate an antenna model for long wire lasers (L >> A).
  • To investigate the relationship between laser parameters and the resulting far-field radiation pattern.
  • To confirm the model's predictions using experimental data from a terahertz quantum cascade wire laser.

Main Methods:

  • Development of a theoretical antenna model specifically for wire lasers with subwavelength cross-sections.

Related Experiment Videos

  • Analysis of the far-field pattern based on the ratio of wavelength to laser length.
  • Theoretical prediction of beam concentration for specific laser modes.
  • Experimental validation using a terahertz quantum cascade wire laser.

    • Main Results:

    • The far-field pattern of wire lasers is shown to be dependent on the wavelength-to-length ratio.
    • A narrow radiation beam, with an angle theta approximately radical(2lambda/L), is predicted for laser modes synchronized with the speed of light in air.
    • Experimental results from a terahertz quantum cascade wire laser demonstrated excellent agreement with the proposed antenna model.

    Conclusions:

    • The proposed antenna model effectively describes the radiation characteristics of long wire lasers.
    • The model accurately predicts the formation of a narrow, directional beam.
    • Experimental validation confirms the model's applicability to practical devices like terahertz quantum cascade wire lasers.