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Gould, C.W.

Paper Title Page
TUPP042 High Power CW Operation of a Hole-Outcoupled Free-Electron Laser
 
  • M.D. Shinn, C.P. Behre, S.V. Benson, C.W. Gould, J.G. Gubeli, D. Hardy, G. Neil, S. Zhang
    Jefferson Lab, Newport News, Virginia
  
 

Funding: This work supported by the Office of Naval Research, the Joint Technology Office, the Army Night Vision Laboratory, the Air Force Research Laboratory, the Commonwealth of Virginia, and by DOE Contract DE-AC05-84ER40150.

In order to provide widely-tunable light to our users, we used a hole outcoupler. To date, we've produced 85 W at 2.8 microns, and been able to continuously tune over a 1 micron spectral range. Besides the anticipated low outcoupling efficiency associated with this scheme, we found that we had considerable problems stabilizing the output when we operated our FEL in cw mode. We believe that this is due to the long time available for mode competition to develop. Measurements of gain, loss, and transverse mode profiles (both intracavity and output) will be compared with our models.