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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 22 — Nov. 15, 2010
  • pp: 3799–3801

High-performance fiber-laser-based terahertz spectrometer

Dominik Stehr, Christopher M. Morris, Christian Schmidt, and Mark S. Sherwin  »View Author Affiliations

Optics Letters, Vol. 35, Issue 22, pp. 3799-3801 (2010)

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We have developed a rapid scanning terahertz (THz) spectrometer based on a synchronized two-fiber-laser system. When the system is set to the asynchronous optical sampling mode, THz spectra extending to 3 THz can be acquired within 1 μ s at a signal-to-noise ratio of the electric field of better than 20. Signal averaging results in a dynamic range of more than 60 dB , and frequency components of more than 4 THz can be detected. When the lasers are set to the same repetition rate, electronically controlled optical sampling at a rate of 2.5 kHz is demonstrated, making the system versatile for different spectroscopic applications. Finally, we compare the THz emission spectra of a photoconductive switch that is pumped at 780 nm and a nonlinear DAST crystal excited at 1550 nm . We find that the spectral range of the spectrometer is significantly enhanced at higher frequencies, while the dynamic range remains constant.

© 2010 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(160.4890) Materials : Organic materials
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:

Original Manuscript: August 19, 2010
Revised Manuscript: October 12, 2010
Manuscript Accepted: October 14, 2010
Published: November 9, 2010

Dominik Stehr, Christopher M. Morris, Christian Schmidt, and Mark S. Sherwin, "High-performance fiber-laser-based terahertz spectrometer," Opt. Lett. 35, 3799-3801 (2010)

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