Spectral Beam Combining of Two Er~(3+)/Yb~(3+) Co-doped Large Mode Area (LMA) Double-clad Fibre Lasers

摘要

Based on an external cavity with a blazed grating for wavelength selection, spectral beam combining of two fibre lasers using large mode area (LMA) multimode Er~(3+)/Yb~(3+) co-doped double-cladding fibre as active medium is demonstrated. The maximum combined power of 0.80W with combining efficiency of about 83% was achieved, and the output beam quality factor M_x~2 and M_y~2 of 1.505 and 1.301, respectively, was obtained. Further, the effect of transform lens with different focal lengths for resultant spectral range is also presented.