26 February 2013 High power 405nm diode laser fiber-coupled single-mode system with high long-term stability
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Abstract
Fiber-coupled 405 nm diode laser systems are rarely used with fiber output powers higher than 50 mW. A quick degradation of fiber-coupled high power modules with wavelengths in the lower range of the visible spectrum is known for several years. Meanwhile, the typical power of single-mode diode lasers around 400 nm is in the order of 100 to 300 mW, leading to single-mode fiber core power densities in the 1 MW/cm2 range. This is three magnitudes of order below the known threshold for optical damage. Our profound investigations on the influence of 405 nm laser light irradiation of single-mode fibers found the growth of periodic surface structures in the form of ripples responsible for the power loss. The ripples are found on the proximal and distal fiber end surfaces, negatively impacting power transmission and beam quality, respectively. Important parameters in the generation of the surface structures are power density, surface roughness and polarization direction. A fiber-coupled high-power 405 nm diode laser system with a high longterm stability will be introduced and described.
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C. P. Gonschior, C. P. Gonschior, K.-F. Klein, K.-F. Klein, D. Heyse, D. Heyse, S. Baumann, S. Baumann, T. Sun, T. Sun, K. T. V. Grattan, K. T. V. Grattan, } "High power 405nm diode laser fiber-coupled single-mode system with high long-term stability", Proc. SPIE 8605, High-Power Diode Laser Technology and Applications XI, 86050O (26 February 2013); doi: 10.1117/12.2003888; https://doi.org/10.1117/12.2003888
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