Glass-clad Cr4+:YAG crystal fiber is demonstrated by a codrawing laser-heated pedestal growth method. As much as 2.45 mW of superwideband amplified spontaneous emission (ASE) is generated in the optical fiber communication band with a 3-dB width of 240 nm. The simulation indicates that the ASE power could be in excess of 20 dBm for a 5-microm-diameter core at a pump power of 2.5 W.
A two‐dimensional simulation was employed to study the melt/air and melt/solid interface shapes of the miniature molten zone formed in a laser‐heated pedestal growth (LHPG) system. Using a non‐orthogonal body‐fitting grid system with the control‐volume finite‐difference method, the interface shape can be determined both efficiently and accurately. During stable growth, the dependence of the molten‐zone length and shape on the heating CO2 laser is examined in detail under both the maximum and the minimum allowed powers with various growth speeds. The effect of gravity on the miniature molten zone is also simulated and the possibility of horizontally oriented LHPG is revealed. Such a horizontal system is good for the growth of long crystal fibers.
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