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

Volume

34

Issue

3

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

559

Lastpage

562

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;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2006.875772

Filename

1643276