Abstract
In this paper, it was experimentally verified that anisotropic (astigmatic) Hermite–Gaussian modes can be generated from a hemi-cylindrical cavity and can be transformed into Laguerre–Gaussian modes by using an extra-cavity plano-convex cylindrical lens which can modify different beam divergence angle in the x–z and y–z planes. By controlling the off-axis pumping and the angle of the extra-cavity cylindrical lens, a variation in laser patterns was observed. Moreover, several additional relationships under different conditions have been analyzed. All experimental results corresponding to the theoretical analysis, and the role of the hemi-cylindrical cavity can be completely understood by comparing the theoretical and experimental results.
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Acknowledgements
The authors thank the Ministry of Science and Technology for their financial support of this research under Contract No. MOST 106-2112-M-003-011.
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Huang, T.D., Lu, T.H. Large astigmatic laser cavity modes and astigmatic compensation. Appl. Phys. B 124, 72 (2018). https://doi.org/10.1007/s00340-018-6943-8
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DOI: https://doi.org/10.1007/s00340-018-6943-8