Spectrum characteristics and pump wavelengths of Nd<sub>3+</sub> -doped double-clad fibe

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Nd<sup>3+</sup> -doped double-clad fiber is a new type of fiber that has large N.A.and large receivingarea compared with single-clad rare-earth-doped fiber.So Nd<sup>3+</sup>-doped double-clad fiberpumped directly by laser-diode ar
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