Efficient pump combiner's for fiber lasers and amplifiers

40 W All-Fiber Er/Yb MOPA System Using Self-Fabricated High-Power Passive Fiber Components

“…Construction with bulk optics [7] LMA The most important components of all-fiber construction techniques of high-power sources are mode field adaptors (MFAs) and fiber power combiners [20][21][22][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. MFAs enable signal transmission between two fibers with different mode-field diameters.…”

“…A splice between non-matched fibers can cause leaking of high power radiation, leading to point overheating and even damaging the fiber and the setup. It is often a problem to match commercial components to the fibers used in the experimental setup, which is still under investigation by many research teams [20][21][22][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. It is important to achieve a low transmission loss of the pump radiation, but most of all, it is essential to achieve a very low transmission loss of the signal radiation, which is more expensive than pump radiation (according to price per W).…”