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Spectra and Laser Characteristics of High-Doped Nd∶YAG Laser Crystals

Mao Yanli 1),2) Qiu Hongwei 1) Xu Jun 1) Deng Peizhen 1) Gan Fuxi 1) 1), Shanghai Institute of Fine Mechanics, The Chinese Academy of Sciences, Shanghai 201800 2), Department of Physics, He′nan University, Kaifeng 475001  
The absorption spectra and fluorescence lifetime of high quality and highly doped Nd∶YAG crystals, grown by the temperature gradient technique in our laboratory were measured. The main absorption peak of Nd∶YAG crystal was 808 nm. The absorption coefficient of Nd∶YAG crystal with 0.030 mole fraction of Nd ion concentration was up to 20.7 cm -1 . The fluorescence lifetime was found to be 150 μs, and concentration quenching was shown. The laser characteristics comparative experiments of highly doped Nd∶YAG and Nd∶YVO 4 crystals pumped by a Ti∶sapphire laser were demonstrated. The mole fractions of concentration of Nd doped YAG crystals were 0.020 and 0.025, and the laser slope efficiency was 29.7% and 32% respectively. The mole fraction of concentraction of Nd doped YVO 4 was 0.030, and its laser slope efficiency was 34.7%. It suggested that high doped Nd∶YAG crystal was comparable in laser characteristics to high doped Nd∶YVO 4 crystal.
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