A tapered-wiggler free-electron-laser oscillator has been operated above threshold at the wavelength of 1.57 jum. The laser was operated with 0%, 1% , and 2% tapers in energy, achieving laser efficiency of 0.4%, 1.1%, and 1.2%, respectively. The efficiency of the 2% taper was three times the untapered case.
The first linac-based visible free-electron-laser oscillator was operated in February 1987 at a wavelength of 525 nm with and without a wiggler taper. Peak output power of 29 kW with a macropulse average power of 1.1 W was observed. The cavity dielectric mirrors were damaged at approximately 21 kW/cm2 of average intracavity power.
Lawrence i,ivermnre Nalional l,aborator) under euntract number W-7405-FNG-,48. "-This document was prepared as an account of work sponsored by an agency of the United Slate. _ _overnment. Neither the United States Government nor the UniversLty of California nor"an)' of their employees, makes an],' warrant)', express or implied, or assumes an)' legal liability or responsibility for the aceurac), completeness_ or usefulness of an)' J informatiea, apparatus, product, or process disclosed, or =-represents that its use would not infringe privately owned right_. Reference herein to an)' specific commerc;._4 products, process, or _ervice by trade name, trademark, manufacturer er, or otherwi_, does not neressarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The vie_s and _pinions of authors e_pressed herein do not necessarily state or reflect those of the United States Go_'ernment or the University of California, an(I shall n(_t Iu., t.sed for advertising or product endorsement purfuDses.
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