Abstract
Recently, a new type of laser cavity has been proposed. It includes two Diffractive Optical Elements set inside the resonator against the cavity mirrors in order to achieve the structuring of the fundamental mode. The latter is a perfect Gaussian beam (M2 = 1) from the output mirror side, and super-Gaussian in the amplifying medium. Such a special cavity allows for improving the energy extraction, and it should be interesting to mode-lock such a laser cavity by using the KLM technique. For that, we aim to model the Kerr lensing effect, induced by a super-Gaussian beam. An analytical expression for the Kerr focal length has been deduced from a Zernike polynomial development. The obtained results are in a good agreement with a diffraction analysis.
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