Title :
Enhancement of frequency-tunability for a Smith-Purcell free-electron laser oscillator in the millimeter-wave region
Author :
Shiozawa, Toshiyuki ; Muya, Tomoko ; Hirata, Akimasa
Author_Institution :
Dept. of Electron. & Inf. Eng., Chubu Univ., Kasugai
fDate :
6/1/2006 12:00:00 AM
Abstract :
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
Keywords :
Bragg gratings; distributed Bragg reflectors; free electron lasers; genetic algorithms; millimetre wave lasers; millimetre wave oscillators; rectangular waveguides; 121 GHz; Smith-Purcell free-electron laser oscillator; frequency-tunability; genetic algorithms; metallic waveguide gratings; millimeter-wave region; quasiperiodic distributed Bragg reflector; rectangular grooves; reflection coefficient; Bandwidth; Bragg gratings; Distributed Bragg reflectors; Free electron lasers; Frequency dependence; Genetic algorithms; Optical reflection; Oscillators; Rectangular waveguides; Waveguide lasers; Metallic Bragg reflector; Smith–Purcell free-electron laser (FEL); millimeter waves; tunability;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2006.875772
