CW-pumped single-pass frequency comb generation by resonant optomechanical nonlinearity in dual-nanoweb fiber

A. Butsch*, J. R. Koehler, R. E. Noskov, P. St J. Russell

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Recent experiments in the field of strong optomechanical interactions have focused on either structures that are simultaneously optically and mechanically resonant, or photonic crystal fibers pumped by a laser intensity modulated at a mechanical resonant frequency of the glass core. Here, we report continuous-wave (CW) pumped self-oscillations of a fiber nanostructure that is only mechanically resonant. Since the mechanism has close similarities to stimulated Raman scattering by molecules, it has been named stimulated Raman-like scattering. The structure consists of two submicrometer thick glass membranes (nanowebs), spaced by a few hundred nanometers and supported inside a 12-cm-long capillary fiber. It is driven into oscillation by a CW pump laser at powers as low as a few milliwatts. As the pump power is increased above threshold, a comb of Stokes and anti-Stokes lines is generated, spaced by the oscillator frequency of ∼6 MHz. An unprecedentedly high Raman-like gain of ∼4 × 106 m−1W−1 is inferred after analysis of the experimental data. Resonant frequencies as high as a few hundred megahertz are possible through the use of thicker and less-wide webs, suggesting that the structure can find application in passive mode-locking of fiber lasers, optical frequency metrology, and spectroscopy.

Original languageEnglish
Pages (from-to)158-164
Number of pages7
Issue number3
StatePublished - 2014
Externally publishedYes


  • Microstructured fibers
  • Nonlinear optics, fibers
  • Optomechanics
  • Scattering, stimulated


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