Title :
Coherent harmonics in the super-radiant regime from an FEL
Author :
Benson, S.V. ; Gubeli, Joe ; Shinn, M.
Author_Institution :
Thomas Jefferson Nat. Accelerator Facility, Newport News, VA, USA
Abstract :
Early work that quantified the ratio of coherent harmonic power to the fundamental power as a function of cavity length found that the ratio peaked for a large cavity length detuning. This is consistent with an overbunching model of coherent harmonic production. Recent measurements on the IR Demo FEL at Jefferson Lab have shown that the ratio is also high very near the synchronous point. In this regime the laser is operating a super-radiant mode, similar to what might be present in a SASE device. The recent data is compared to predictions of harmonic production in both long pulse oscillators and SASE FELs
Keywords :
free electron lasers; harmonics; FEL; IR Demo FEL; SASE FEL; cavity length detuning; coherent harmonics; fundamental power; overbunching; super-radiant regime; Electron microscopy; Free electron lasers; Laser modes; Masers; Optical harmonic generation; Optical pulses; Oscillators; Power system harmonics; Production; Pulse modulation;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.987893
