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Highly efficient, Large Mode Area (LMA) fibers for use in high power eye-safe wavelength lasing applications

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Highly efficient, Large Mode Area (LMA) fibers for use in high power eye-safe wavelength lasing applications

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  • Author: Adrian Carter
The recent development of large-mode area (LMA) Yb-doped double clad fibers and high brightness diodes has lead to demonstrations of kilowatt level CW outputs and megawatt level peak powers in sub-nanosecond pulsed amplifiers. Such output powers have been achieved with near diffraction-limited output beam quality, because the low NA core supports only a few modes and the higher order modes can be easily discriminated against by preferential seeding,1 and/or bending. However, due to the inherent difficulties associated with manufacturing fibers containing relatively high lanthanide ion dopant concentrations whilst maintaining a low core NA, the development of LMA fibers has until recently been restricted to Yb fibers for use at around 1.0μm.

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