Two compact fiber lasers based on the gain medium of Nd-doped phosphate glass multicore fiber (MCF), of length no more than 10 cm, have been demonstrated experimentally for the first time. A stable phase-locked laser beam at 1055 nm emitted from a three-core fiber that is 8.5 cm in length has been achieved, with a maximum output power of 20 mW. The properties of similar seven-core fiber laser also have been investigated.
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Zhang et al. (2011) studied this question.
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