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An auxiliary sapphire tube assisted to alleviate the fluctuation of the heating power was used in the CDLHPG system for fabricating the more uniform 10-mum-core crystal fibers, the improved core uniformity was demonstrated.
Dual-pump scheme and a high-reflection coating deposited on one crystal fiber endface were used to increase the ASE of the Cr4+:YAG double-clad crystal fiber. As much as 1.72 mW of collimated ASE power was obtained.
An auxiliary sapphire tube serving as a heat capacitor was used in the co-drawing laser-heated pedestal growth system for fabricating small core crystal fibers. A factor of 3 improvement was achieved. Uniform 10-μm-core double-clad Cr4+:YAG crystal fibers were successfully fabricated as a result.
Broadband emission was generated with a 3-dB bandwidth of 406 nm at a center wavelength of 1140 nm by chromium doped fiber. This broadband emission is attributed to emission centers of Cr3+ in high-field site (HFS) and Cr4+ in both HFS and low-field site (LFS) when excited by 900-nm pumping wavelength
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