Abstract
A bulk Nd:LaCa4O(BO3)3 (Nd:LaCOB) single crystal with the low Nd3+-doping concentration (~0.5 at%) was grown by Czochralski (Cz) method. Its powder X-ray diffraction, Nd3+ ions doping concentration, polarized transmittance and emission spectra, and fluorescence lifetimes were tested. Based on the Judd-Ofelt theory, the spectral parameters of Nd:LaCOB (Nd3+, ~0.5 at%) crystals including polarized absorption and emission cross sections, spontaneous transition probability, fluorescence branching ratio, theoretical fluorescence lifetime and intensity parameters (Ω2, Ω4 and Ω6) were systemically investigated. The calculated radiation lifetimes were compared with the experimental values, resulting in a quantum yield of 33%, which was the highest record among all the Nd:ReCOB (Re: Y, Gd, La1−xGdx) type crystals. The spectral properties of Nd:LaCOB were found to be better than those of Nd:YCOB and Nd:GdCOB crystals, especially in polarized absorption and emission cross sections. The self-frequency-doubling (SFD) angles were calculated according to the main fluorescence peaks of Nd:LaCOB (Nd3+, ~0.5 at%) crystals such as 1041 nm, 1060 nm, 1090 nm and 1102 nm, which would be excited and frequency doubled into blue-green, green, yellow-green and yellow lasers. All the results showed that the Nd:LaCOB crystals had potential applications in the field of laser and SFD.
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