Transverse mode selection in a monolithic microchip laser |
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| Authors: | Darryl Naidoo Thomas Godin Emmanuel Cagniot Andrew Forbes Kamel Aït-Ameur |
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| Institution: | a CSIR National Laser Centre, P. O. Box 395, Pretoria 0001, South Africab School of Physics, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africac Centre de Recherche sur les Ions, les Matériaux et la Photonique, UMR 6252, CEA-CNRS-ENSICAEN et Université de Caen, ENSICAEN, 6 Boulevard Maréchal Juin, F-14050 Caen, Franced Institut FEMTO-ST, UMR 6174, CNRS-ENSMM et Université Technologique de Belfort-Monbéliard, 32 Avenue de l'Observatoire, F-25044 Besançon cedex, France |
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| Abstract: | We outline an approach to mode selection in a microchip laser through judicious shaping of the pump light to create a high modal overlap with the desired mode. We demonstrate the principle by creating a donut-shaped pump profile in the focal plane of a converging lens, and use this profile to longitudinally pump a monolithic microchip laser where the output is a Laguerre-Gaussian mode of radial index p = 0 and azimuthal index l = 1 (LG0l), or vortex beam, of power ~ 12 mW with a slope efficiency of 17%. This approach of diffractive pump shaping in the Fourier domain is advantageous as it allows for high pump intensity even with low pumping powers, thus ensuring sufficient gain is achieved for laser oscillation. |
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| Keywords: | Pump shaping Microchip laser Vortex beam Higher order modes |
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