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Proceedings Paper

Measurements of the spectral and temporal evolution of FEL macropulses
Author(s): John A. Kozub; Bibo Feng; William E. Gabella
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Paper Abstract

The Vanderbilt Mark III FEL is a tunable source of coherent mid-infrared radiation occurring as a train of high- intensity (picosecond) micropulses with a repetition rate of 3GHz that continues for 3-5 microseconds (the macropulse). We have measured the spectral output of the Vanderbilt FEL as a function of time during the macropulse with ~10nm resolution in wavelength and ~20ns resolution in time. The measurement takes about one minute and gives a representation of the micropulse spectral width average over many macropulses. Data collected thus far indicates a surprising amount of structure produced by overlapping periods of growth, saturation, and decay within the macropulse. It is found that the central wavelength of the FEL slips over the course of the macropulse, and that the instantaneous output typically has a much smaller spectral bandwidth than the macropulse bandwidth. Thus, a user slicing portion fo the macropulse with a Pockel's Cell can obtain different central wavelengths by slicing at different times during the macropulse. The evolution of the macropulse spectrum as a function of cavity de-tuning and electron beam parameters is studied with the goal of improving the stability and spectral density of the FEL output.

Paper Details

Date Published: 1 April 2002
PDF: 9 pages
Proc. SPIE 4633, Commercial and Biomedical Applications of Ultrafast and Free-Electron Lasers, (1 April 2002); doi: 10.1117/12.461375
Show Author Affiliations
John A. Kozub, Vanderbilt Univ. (United States)
Bibo Feng, Vanderbilt Univ. (United States)
William E. Gabella, Vanderbilt Univ. (United States)

Published in SPIE Proceedings Vol. 4633:
Commercial and Biomedical Applications of Ultrafast and Free-Electron Lasers
Joseph Neev; Glenn S. Edwards; Joseph Neev; Andreas Ostendorf; Andreas Ostendorf; John Clark Sutherland, Editor(s)

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