17 February 2003 Fourier-optical transverse mode selection in broad area lasers: experiment and simulation
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Proceedings Volume 4833, Applications of Photonic Technology 5; (2003) https://doi.org/10.1117/12.474844
Event: Applications of Photonic Technology 5, 2002, Quebec City, Canada
Abstract
Broad area lasers (BALs) with external Fourier-optical cavities with spatial filter for transverse mode selection are investigated experimentally and numerically. Nearfield and farfield distributions are calculated and compared to experimental results. Two different BALs, one with a high (10%) and the other with a very low residual reflectivity of the output facet (facing the external resonator) are operated in external Fourier-optical 4f setups. For the BAL mentioned first, transverse mode selection is obtained at low pump currents; the emission of the fundamental or a specific higher order transverse mode can be stabilized. In the latter BAL transverse modes can be selectively excited up to pump currents more than 200% above laser threshold. Numerical calculations reveal, that if this BAL within an external 4f-cavity is pumped even higher above laser threshold, it starts to operate in a self-Q-switched mode. Pulse duration and repetition rates are in the range of 2-4ns and 100-200MHz, respectively. Also, the concept and technology for fabrication of compact, miniaturized hybrid integrated Fourier-optical external cavities based on polymer waveguide mirrors is described. Experimental results of transverse mode selection in BALs with hybrid integrated-optical cavities are presented.
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Sandra Wolff, Andrey Yu. Rodionov, Vladimir E. Sherstobitov, Henning Fouckhardt, "Fourier-optical transverse mode selection in broad area lasers: experiment and simulation", Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003); doi: 10.1117/12.474844; https://doi.org/10.1117/12.474844
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