Power scaling of fiber lasers has always been pursued, being limited by nonlinear effects and heat generation in the active fiber and various components. Among the most critical components are cladding light strippers (CLS) between amplifier chains, removing light from leaked higher order modes, the unabsorbed pump or losses from splices and components. Polymer-based CLS work sufficiently well for the near-IR including the pump wavelength at 793 nm but suffer from high absorption at the signal wavelength near 2 μm and have not been evaluated in detail in this regime. Therefore, it is necessary to examine different acrylates and siloxanes at both the pump and signal wavelengths individually concerning their performance as CLS and test their limits. We present a CLS with an improved design which can withstand 7.5 W at 2039 nm while stripping >46 dB. For higher powers to >800 W, we examine CO2-laser inscribed CLS at the pump wavelength, reaching 21 dB stripping efficiency within only 15 mm of length.
Numerical analysis of multicore fiber tapers as a mode area scaling technique for use in coherently combined laser systems is demonstrated. Taper designs are modelled with beam propagation method (BPM) numerical simulations to analyze inter-core crosstalk and mode distortion in centimeter-scale taper transitions. By evaluating taper performance for a range of taper lengths on the scale of centimeters, optimized taper designs can be found for a given MCF design. Tapers based on these simulations are fabricated using a CO2 laser tapering system.
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