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A crystal fiber of yttrium scandate YScO 3 doped with Nd 3+ , with a cubic bixbyite-type crystal structure, has been synthesized through laser-heated pedestal growth for the first time. Its crystal structure has been determined using low-temperature (150 K) single-crystal X-ray diffraction: space group Ia3̅ , a = 10.2166(1) Å, R = 0.0177. A new phase was characterized with micro-Raman scattering and fluorescence. Fluorescence excitation measurements show two complex local positions of Nd 3+ in the crystal structure with lifetimes τ 1 = 290 and τ 2 = 250 μs ( 4 F 3/2 multifold) at a temperature T = 77 K.

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Abstract:The basic purpose of research was the creation of crystal fibers for application as temperature gauges for severe environments. Single crystal fibers of sapphire and YAG with sensitive zone doped by Cr ions were successfully grown up by the Laser Heated Pedestal Growth method. The results of temperature measurements are presented for a range 25−4000• C. Those temperature dependences of luminescence lifetime and spectra of Cr 3+ -ions in the crystal fibers are consistent with the data observed with bulk samples, being grown by Czochralski technique. mmSinge-crystal sapphire fiber doped with Cr at the tip

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