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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 27, Iss. 17 — Sep. 1, 2009
  • pp: 3773–3776

Active Balance in Free-Space Electro-Optic Detection of Terahertz Waves

Brian Schulkin and Xi-Cheng Zhang

Journal of Lightwave Technology, Vol. 27, Issue 17, pp. 3773-3776 (2009)

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A method for increasing the stability of terahertz (THz) time-domain spectrometers utilizing electro-optic balanced detection is presented in this paper. The stability of these systems is sensitive to optical alignment and polarization quality; small changes in temperature, pressure, stress, and strain can all affect SNR. High stability is achieved by precise rotation of the quarter-wave plate (QWP) balance position during the operation of the THz spectrometer. Providing feedback via QWP rotation optimizes the noise floor with minimal modulation to the THz signal in a nonideal optical system. Applying active balance control eliminates constant tuning by the operator between scans, after purging with dry nitrogen, applying vacuum, and during system setup.

© 2009 IEEE

Brian Schulkin and Xi-Cheng Zhang, "Active Balance in Free-Space Electro-Optic Detection of Terahertz Waves," J. Lightwave Technol. 27, 3773-3776 (2009)

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