Study of a Raman free-electron laser oscillator with Bragg reflection resonators
Abstract
A high-gain Raman free-electron laser oscillator is realized by using a Bragg reflection resonator with a limited pulse duration of the electron beam (0.4 MeV/800 A, 60 ns). The practical design of the Bragg reflectors is introduced. A concept of hybrid oscillator configuration which combines the high gain of a superradiant amplifier with the narrow bandwidth of a conventional oscillator (Fabry-Perot resonator) is put forward and is confirmed by experimental results. It shows that 14 MW peak power at 7.7 mm wavelength (bandwidth of less than 5 percent) with a 4.4 percent electronic efficiency is produced. The measured fundamental wavelength of the radiation spectrum is compared with the result of calculations.
- Publication:
-
IEEE Journal of Quantum Electronics
- Pub Date:
- March 1991
- DOI:
- 10.1109/3.81352
- Bibcode:
- 1991IJQE...27..488C
- Keywords:
-
- Bragg Angle;
- Free Electron Lasers;
- Optical Resonators;
- Raman Lasers;
- Relativistic Electron Beams;
- Bandwidth;
- Power Gain;
- Pulse Duration;
- Wave Propagation;
- Wavelengths;
- Lasers and Masers