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- ItemImprovement of output beam quality in broad area lasers with off-axis feedback(Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik, 2011) Lichtner, Mark; Tronciu, Vasile; Vladimirov, Andrej G.We report a method to improve the beam quality of broad area lasers by using a V-shaped external cavity formed by two off-axis feedback mirrors that allow to select a single transverse mode with the intensity modulated in the transverse direction. We find that in the case when one of the two feedback mirrors is absent a spontaneous formation of self-induced transverse population grating leading to a reduction of the lasing threshold is observed. Most favorable conditions for stabilization of single transverse supermode and creation of a high power and high brightness plane wave traveling in the extended cavity are obtained for equal re ectivities of the two external reflectors.