Enhancement of frequency-tunability for a Smith-Purcell free-electron laser oscillator in the millimeter-wave region
| Autor: | T. Muya, Akimasa Hirata, Toshiyuki Shiozawa |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Physics
Nuclear and High Energy Physics business.industry Free-electron laser Physics::Optics Bragg's law Grating Condensed Matter Physics Distributed Bragg reflector Smith–Purcell effect chemistry.chemical_compound Optics chemistry Extremely high frequency Reflection coefficient Center frequency business |
| Zdroj: | IEEE Transactions on Plasma Science. 34:559-562 |
| ISSN: | 0093-3813 |
| DOI: | 10.1109/tps.2006.875772 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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