The effect of transverse modes in a wave-guide resonator on the resonance condition of a compton FEL

Verschuur, J.W.J. and Ernst, G.J. and Oerle van, B.M. and Bisero, D. (1997) The effect of transverse modes in a wave-guide resonator on the resonance condition of a compton FEL. Optics Communications, 133 (1-6). pp. 229-233. ISSN 0030-4018

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Abstract:	In a free electron laser where the resonator has a wave-guide structure the phase velocity of the light has a significant impact on the wavelength of the output radiation. This effect is well known in Raman-type FEL's. It is however less known that this effect can also play an important role in Compton-type FEL's. This effect has been experimentally verified in our 6 MeV Compton-type FEL, having a wave-guide resonator with a hole in the outcoupling mirror. Successive transverse modes, which have distinct phase velocities, show up at different wavelengths in the output spectrum. The difference appeared to be as large as 5% of the resonance wavelength. In normal lasers this difference is not more than about 0.1%.
Item Type:	Article
Copyright:	© 1997 Elsevier Science
Faculty:	Science and Technology (TNW)
Research Group:	Laser Physics and Nonlinear Optics (LPNO)
Link to this item:	http://purl.utwente.nl/publications/23649
Official URL:	http://dx.doi.org/10.1016/S0030-4018(96)00475-0
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