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Proceedings Paper

Compact 1-kW infrared regenerative amplifier FEL
Author(s): Richard L. Sheffield; Dinh C. Nguyen; John C. Goldstein; Nizar A. Ebrahim; Clifford M. Fortgang; John M. Kinross-Wright
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Paper Abstract

This paper describes the design, construction, and initial operation of an infrared FEL designed for 1 kW average power. The experiment utilizes the existing advanced free-electron laser (AFEL) accelerator. An expected 6% extraction efficiency of electron beam power to optical power gives an overall wall- plug efficiency of approximately 1%. The 10 to 20 MeV electron accelerator is 1.2 m long. This regenerative amplifier FEL (RAFEL) relies on a few (less than ten) passes to reach saturation. The technique is similar to a FEL oscillator through the use of optical feedback to reach saturation. However, in this design the feedback is limited to less than 1% in the large signal regime. The chief advantage to this approach is that no mirror is exposed to a high peak intensity, enabling high-average power in a compact optical configuration. To compensate for the low optical feedback, the single-pass gain must be very high. In our design, the single- pass gain is 105 in the small signal regime. RAFEL is presently configured to operate at a wavelength near 16 microns. However, this system is scaleable to shorter wavelengths by increasing beam energy. Present results indicate that a single pass gain of 60 in the infrared has been observed.

Paper Details

Date Published: 15 May 1997
PDF: 10 pages
Proc. SPIE 2988, Free-Electron Laser Challenges, (15 May 1997); doi: 10.1117/12.274394
Show Author Affiliations
Richard L. Sheffield, Los Alamos National Lab. (United States)
Dinh C. Nguyen, Los Alamos National Lab. (United States)
John C. Goldstein, Los Alamos National Lab. (United States)
Nizar A. Ebrahim, Los Alamos National Lab. (United States)
Clifford M. Fortgang, Los Alamos National Lab. (United States)
John M. Kinross-Wright, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 2988:
Free-Electron Laser Challenges
Patrick G. O'Shea; Harold E. Bennett, Editor(s)

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