Abstract
A design of a Bragg reflector for a Raman FEL is described. It is shown that mode conversion occurs whenever the axial wavenumbers of the two modes fulfil the Bragg condition. With a constant ripple of the corrugation it is shown that the reflected radiation also contains higher order modes, assuming that the incident radiation consists only of a TE11 mode. The mode purity can be increased by increasing the length of the reflector at the expense of a smaller reflection bandwidth. A more flexible method is by applying a Hamming window to the corrugation of the reflector. Contributions of other modes to the reflected radiation can in that case be neglected. The reflector will be installed in a Raman laser to be able to compare the amplifier with the oscillator configuration. Therefore some preliminary results are also presented about the start-up of the Raman laser.
| Original language | English |
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| Pages (from-to) | 484-488 |
| Number of pages | 5 |
| Journal | Nuclear instruments & methods in physics research. Section A : Accelerators, spectrometers, detectors and associated equipment |
| Volume | 341 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - 1994 |
| Event | 15th International Free Electron Laser Conference, FEL 1993 - Netherlands Congress Centre, The Hague, Netherlands Duration: 23 Aug 1993 → 27 Aug 1993 Conference number: 15 |