Excess noise generation during spectral broadening in a microstructured fiber |
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Authors: | JN Ames S Ghosh RS Windeler AL Gaeta ST Cundiff |
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Institution: | JILA, University of Colorado and National Institute of Standards and Technology, CO 80309–0440, Boulder, USA School of Applied and Engineering Physics, Cornell University, NY 14853, Ithaca, USA OFS Fitel Laboratories, NJ 07974, Murray Hill, USA
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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. |
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