Applied Physics B

, Volume 77, Issue 2, pp 279–284

Excess noise generation during spectral broadening in a microstructured fiber

  • J.N. Ames
  • S. Ghosh
  • R.S. Windeler
  • A.L. Gaeta
  • S.T. Cundiff
Regular Paper

DOI: 10.1007/s00340-003-1177-8

Cite this article as:
Ames, J., Ghosh, S., Windeler, R. et al. Appl Phys B (2003) 77: 279. doi:10.1007/s00340-003-1177-8

Abstract

We observe that nanojoule femtosecond pulses that are spectrally broadened in a microstructured fiber acquire excess noise. The excess noise is manifested as an increase in the noise floor of the rf spectrum of the photocurrent from a photodetector illuminated by the pulse train from the laser oscillator. Measurements are made of the intensity dependence of the excess noise for both 100 fs and sub-10 fs pulses. The excess noise is very strong for 100 fs pulses, but barely measurable for sub-10 fs pulses. A rigorous quantum treatment of the nonlinear propagation of ultrashort pulses predicts that, for a fixed generated bandwidth, the amount of excess noise decreases with pulse duration, in agreement with the experimental results.

Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • J.N. Ames
    • 1
  • S. Ghosh
    • 2
  • R.S. Windeler
    • 3
  • A.L. Gaeta
    • 2
  • S.T. Cundiff
    • 1
  1. 1.JILAUniversity of Colorado and National Institute of Standards and TechnologyBoulderUSA
  2. 2.School of Applied and Engineering PhysicsCornell UniversityIthacaUSA
  3. 3.OFS Fitel LaboratoriesMurray HillUSA