We proposed and demonstrated an all-fiber laser to generate cylindrical vector beams at
1030 nm. The cylindrical vector beams were obtained by exciting high order mode operating in
the few-mode fiber inside the laser system, which was implemented through adjusting the angle
and transversal dimension of a couple of fiber collimators. The radial and azimuthal polarization
beams can be switchable conveniently just by applying twist and pressure to the few-mode fiber.
We experimentally demonstrate coherent beam combination of two double-clad fiber lasers using mutual injectionlocking
in an external cavity coupling structure. The configuration employs a corner cube as a mutual injection
component to couple the two lasers. A beam splitter acts as the output coupler and far field intensity has been observed
at the lens focus plane. We observe interferential fringes with the contrast ratio of 0.5, and a combination efficiency of
80% is achieved. The total output power exceeds 11 W. We present simulative discussion here on the influence of multitransversal
modes of element beam. The multi-mode operation degrades the quality of the output beam of main peak
power, fringe contrast ratio, and other parameters. The configuration has the potential to scale to more lasers without
much structural modification.
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