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Enhancement of frequency-tunability for a Smith-Purcell free-electron laser oscillator in the millimeter-wave region

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3 Author(s)
Shiozawa, T. ; Dept. of Electron. & Inf. Eng., Chubu Univ., Kasugai ; Muya, T. ; Hirata, A.

The frequency-tunability for a Smith-Purcell free-electron laser oscillator in the millimeter wave region is enhanced with the aid of a quasi-periodic distributed Bragg reflector (DBR) made of metallic waveguide gratings with rectangular grooves. For a quasi-periodic DBR, the grating parameters are adjusted by means of genetic algorithms to get the desired reflection coefficient, thus compensating for the frequency dependence of the overall output characteristics. For a typical numerical example, flat output characteristics have been obtained over 10% bandwidth around the center frequency 121 GHz

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Plasma Science, IEEE Transactions on  (Volume:34 ,  Issue: 3 )