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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Published on: June 8, 2018

Nonlinear amplification of side-modes in frequency combs.

R A Probst1, T Steinmetz, T Wilken

  • 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str 1, 85748 Garching, Germany. rprobst@mpq.mpg.de

Optics Express
|June 6, 2013
PubMed
Summary
This summary is machine-generated.

Suppressed modes in frequency combs are amplified after frequency doubling and nonlinear propagation. This amplification can lead to calibration errors in spectrographs used in astronomy.

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Nonlinear Optics

Background:

  • Frequency combs are precise light sources with regularly spaced spectral lines.
  • Suppressed modes in frequency combs can be an issue for certain applications.
  • Spectrograph calibration requires stable and well-defined spectral lines.

Purpose of the Study:

  • To investigate the amplification of suppressed modes in frequency combs.
  • To understand the impact of frequency doubling and self-phase modulation on these modes.
  • To assess the implications for spectrograph calibration in astronomy.

Main Methods:

  • Experimental measurements of frequency comb spectra.
  • Development and application of a simplified theoretical model.
  • Analysis of mode amplification under different nonlinear conditions.

Main Results:

  • Both frequency doubling and self-phase modulation amplify suppressed modes relative to principal modes.
  • Frequency doubling causes a 6 dB relative strength increase.
  • Self-phase modulation leads to stronger amplification, increasing with propagation length.

Conclusions:

  • Amplification of suppressed modes can compromise spectrograph calibration accuracy.
  • Non-perfect filtering followed by frequency conversion or spectral broadening exacerbates this issue.
  • Understanding and mitigating this effect is crucial for high-precision astronomical calibration using frequency combs.