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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 4 — Apr. 1, 2012
  • pp: 614–620

Using a fiber stretcher as a fast phase modulator in a continuous wave terahertz spectrometer

Axel Roggenbuck, Komalavalli Thirunavukkuarasu, Holger Schmitz, Jennifer Marx, Anselm Deninger, Ivan Cámara Mayorga, Rolf Güsten, Joachim Hemberger, and Markus Grüninger  »View Author Affiliations


JOSA B, Vol. 29, Issue 4, pp. 614-620 (2012)
http://dx.doi.org/10.1364/JOSAB.29.000614


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Abstract

Continuous wave terahertz spectroscopy based on photomixing offers the attractive feature of detecting both amplitude and phase of the terahertz radiation. Experimentally, it is challenging to achieve sufficient accuracy at a high data acquisition rate. We use two fiber stretchers as fast phase modulators in a symmetric setup. Compared to a mechanical delay stage, the fiber stretchers are rather fast (1kHz), which enables us to record a spectrum up to 1.8 THz with a step size of 1 GHz in only 10 min. We achieve a stability of the optical path difference of around 10 μm and use low-doped Si as an example to demonstrate the performance of our spectrometer.

© 2012 Optical Society of America

OCIS Codes
(060.5060) Fiber optics and optical communications : Phase modulation
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: December 6, 2011
Manuscript Accepted: January 17, 2012
Published: March 16, 2012

Citation
Axel Roggenbuck, Komalavalli Thirunavukkuarasu, Holger Schmitz, Jennifer Marx, Anselm Deninger, Ivan Cámara Mayorga, Rolf Güsten, Joachim Hemberger, and Markus Grüninger, "Using a fiber stretcher as a fast phase modulator in a continuous wave terahertz spectrometer," J. Opt. Soc. Am. B 29, 614-620 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-4-614

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