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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 10 — May. 20, 2013
  • pp: 11670–11687

Nonlinear amplification of side-modes in frequency combs

R. A. Probst, T. Steinmetz, T. Wilken, H. Hundertmark, S. P. Stark, G. K. L. Wong, P. St. J. Russell, T. W. Hänsch, R. Holzwarth, and Th. Udem  »View Author Affiliations


Optics Express, Vol. 21, Issue 10, pp. 11670-11687 (2013)
http://dx.doi.org/10.1364/OE.21.011670


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Abstract

We investigate how suppressed modes in frequency combs are modified upon frequency doubling and self-phase modulation. We find, both experimentally and by using a simplified model, that these side-modes are amplified relative to the principal comb modes. Whereas frequency doubling increases their relative strength by 6 dB, the growth due to self-phase modulation can be much stronger and generally increases with nonlinear propagation length. Upper limits for this effect are derived in this work. This behavior has implications for high-precision calibration of spectrographs with frequency combs used for example in astronomy. For this application, Fabry-Pérot filter cavities are used to increase the mode spacing to exceed the resolution of the spectrograph. Frequency conversion and/or spectral broadening after non-perfect filtering reamplify the suppressed modes, which can lead to calibration errors.

© 2013 OSA

OCIS Codes
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(300.6310) Spectroscopy : Spectroscopy, heterodyne

ToC Category:
Nonlinear Optics

History
Original Manuscript: March 6, 2013
Revised Manuscript: April 16, 2013
Manuscript Accepted: April 20, 2013
Published: May 6, 2013

Citation
R. A. Probst, T. Steinmetz, T. Wilken, H. Hundertmark, S. P. Stark, G. K. L. Wong, P. St. J. Russell, T. W. Hänsch, R. Holzwarth, and Th. Udem, "Nonlinear amplification of side-modes in frequency combs," Opt. Express 21, 11670-11687 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-10-11670


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