Growth and spectroscopic properties of Ti-doped sapphire single-crystal fibers

• Ti:Al2O3 single crystal fibers were grown by the micro-pulling-down method.
• The bubbles in the crystal fibers are always elongated if higher pulling rates used.
• Ti:Al2O3 crystal fibers present two blue emission bands, peaking at 420 and 470 nm.

Titanium doped sapphire (Ti:Al2O3) crystal fibers have been grown by the micro-pulling-down (μ-PD) method using different pulling rate in the range (0.1–0.5 mm/min). The present work has investigated the crystal growth, including diameter, bubbles defects and segregation properties. The fiber’s absorption and IR emission experiments are analyzed. The lifetime of Ti3+ in the IR range obtained at room temperature is 3.1 μs. Moreover, the two blue emissions at 420 nm and 470 nm bands have been discussed.

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