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Folded diffractive laser resonators with user-defined fundamental mode

: Büttner, A.; Zeitner, U.; Kowarschick, R.

Postprint (PDF; )

Applied Physics. B 81 (2005), Nr.5, S.601-606
ISSN: 0340-3793
ISSN: 0721-7269
ISSN: 0946-2171
ISSN: 1432-0649
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()
Laser resonator; adjustment effort; beam quality; resonator axis

The adjustment effort required for the alignment of laser resonators with arbitrarily shaped end mirrors can be significantly reduced by folding the resonator path half-way between the two end mirrors and by slightly tilting the resonator axis. Thus the resulting resonator consists only of one diffractive mirror and a plane mirror, and the separate alignment of both diffractive end mirrors with respect to each other can be avoided. This principle is demonstrated by a Nd:YAG laser with super-Gaussian output beam. Furthermore, it is shown theoretically that the influence of phase quantization effects on the beam quality can be strongly reduced as a consequence of the tilted resonator axis.