Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Brewster-Angle Attenuator for THz Pulses



A G. VanEngen Spivey, S T. Cundiff


A variable attenuator for terahertz (THz) pulses is developed on the based of the change in reflectivity of lithium niobate wafers with incident angle in a Brewster configuration. We can vary the THz field transmission from 22% to 54%, a change of a factor of 2.5 while preserving the shape of the THz pulse spectrum. Changes in the THz spectrum are shown to be much smaller when the Brewster attenuator is used than when either the near-infrared pump power or the bias voltage on a THz photoconductive antenna is varied. The Brewster attenuator should prove especially useful for varying the THz field in nonlinear optical studies that use broadband THz pulses.
Applied Optics


attenuator, lithium niobate, terahertz, ultrafast optics


VanEngen, A. and Cundiff, S. (2002), Brewster-Angle Attenuator for THz Pulses, Applied Optics (Accessed April 12, 2024)
Created December 1, 2002, Updated February 17, 2017