Observation of power instability and multimode behavior in a far-infrared free-electron laser

Amir, Avner; Elias, Luis R.; Gregoire, Dan J.; Hu, R. James; Kotthaus, Jörg P.; Ramian, Gerald; Stern, Avinoam
December 1985
Applied Physics Letters;12/15/1985, Vol. 47 Issue 12, p1251
Academic Journal
Measurements of the time dependence and the frequency spectrum of the output power in the farinfrared free-electron laser at the University of California at Santa Barbara are reported. In typical light pulses of 20-50 µs we have observed unexpected oscillations of the laser output with a. characteristic period of 5 µs. At the same time, the laser frequency swept over a discrete set of frequency modes, separated by 1.3 GHz. We also present measurements of the gain and loss ofthe optical mode and discuss the problem of the accelerator terminal voltage drop in a single electron beam pulse with relation to the light spectrum.


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