title: Control of the spatiotemporal emission of a broad-area semiconductor laser by spatially filtered feedback.
abstract: We demonstrate the control of the spatiotemporal emission dynamics of a broad-area semiconductor laser in an external optical feedback configuration formed by a spatially filtering mirror. The emission properties are studied with a single-shot streak camera with temporal resolution of approximately 7 ps and spatial resolution of approximately 5 microm. Our results show a significant reduction of the spatial filamentation and, furthermore, suppression of the spatiotemporal instabilities, which are both intrinsic emission properties of standard high-power broad-area lasers. Associated with the control of the emission dynamics, strong improvement of the beam quality, which is essential for numerous high-power applications, is possible.
authors.affiliation: Institute of Applied Physics, Darmstadt University of Technology, Schlossgartenstrasse 7, D-64289 Darmstadt, Germany. shyam.mandre@physik.tu-darmstadt.de
authors.forename: Shyam K
authors.initials: SK
authors.lastname: Mandre
authors.forename: Ingo
authors.initials: I
authors.lastname: Fischer
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Elsässer