![]() ![]() These modes have little practical application. These high order modes exhibit greater intensity steepness but no OAM. ![]() ![]() Through this we have generated Laguerre-Gaussian 'petal' modes up to an azimuthal order of 23. By using a fibre with a 0.8 aspect ratio between its inner and outer radius, we would be able to select higher order doughnut modes that have a steeper intensity profile and more OAM per photon. We have selectively excited doughnut modes by coupling multi-modal laser diode pump light into capillary fibres and re-imaging the fibre end into a Nd:YAG gain medium. To the best of our knowledge, however, no concrete method has been presented for selecting the handedness within the cavity. This maintains all the advantages of power scaling normally associated with solid state lasers, and has the potential for excellent beam quality. Initially we explored intra-cavity, gain shaping methods in Nd:YAG to achieve these goals. All of which are key in order to fully understand the impact of these modes on laser processing. A key research goal has been to obtain such modes with high purity and the ability to select the handedness of the OAM, in a system with robust potential for power scaling. These modes have potential in this field due to their increasing mode steepness with azimuthal phase and their potential for carrying orbital angular momentum (OAM). We have explored several methods of generating Laguerre-Gaussian doughnut modes with the eventual application of laser processing directing our research. ![]()
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