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Brewster's angle attenuator for terahertz pulses.

Amelia G VanEngen Spivey1, Steven T Cundiff

  • 1JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309-0440, USA.

Applied Optics
|January 4, 2003
PubMed
Summary

A new terahertz (THz) variable attenuator uses lithium niobate in a Brewster configuration. This device offers a 2.5x THz field strength adjustment while maintaining spectral integrity for nonlinear optics.

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Area of Science:

  • Optics and Photonics
  • Terahertz (THz) Science and Technology
  • Materials Science

Background:

  • Controlling terahertz (THz) field strength is crucial for nonlinear optical studies.
  • Existing methods for THz attenuation can alter the spectral characteristics of THz pulses.
  • Broadband THz sources require precise and spectrally preserving attenuation techniques.

Purpose of the Study:

  • To develop a variable attenuator for terahertz (THz) pulses.
  • To achieve adjustable THz field strength while preserving the spectral shape of the THz pulse.
  • To provide a more suitable attenuation method for nonlinear optical experiments using broadband THz pulses.

Main Methods:

  • Utilized lithium niobate wafers in a Brewster configuration.
  • Exploited the change in reflectivity of lithium niobate with incident angle to control THz transmission.
  • Measured THz field transmission and spectral characteristics across the attenuation range.

Main Results:

  • Developed a variable attenuator capable of adjusting THz field transmission from 22% to 54% (a factor of 2.5).
  • Demonstrated that the spectral shape of the THz pulse is preserved during attenuation.
  • Observed significantly smaller spectral changes compared to variations in near-infrared pump power or THz photoconductive antenna bias voltage.

Conclusions:

  • The developed Brewster configuration attenuator provides effective and spectrally preserving control over THz field strength.
  • This method is advantageous over pump power or bias voltage adjustments for maintaining spectral integrity.
  • The attenuator is a valuable tool for nonlinear optical studies requiring variable THz field strengths with broadband THz pulses.

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