Induced emission cross sections of near-stoichiometric LiNbO3: Mg, Nd

被引：0
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作者：
Sekita, Masami [1 ]
Nakamura, Masaru [1 ]
Watanabe, Akiteru [1 ]
Takekawa, Shunji [1 ]
Kitamura, Kenji [1 ]
机构：
[1] Advanced Nano Materials Laboratory, National Institute for Materials Science, Namiki, Tsukuba, Ibaraki 305-0044, Japan
来源：
Journal of Applied Physics | 2006年 / 100卷 / 10期
关键词：
Optical absorption and emission spectra are measured on Nd3+ ion in near-stoichiometric LiNb O3 single crystals codoped with MgO. From the decomposition of the nonpolarized spectra; the Stark splitting scheme is established for 2 wt % Nd3+ ion in the near-stoichiometric LiNb O3: Mg; Nd system. The induced emission cross sections are calculated to be 2.70× 10-19 and 5.57× 10-20 cm2 for the π and polarizations; respectively; based on the decomposition of the polarized spectra. These values agree well with the reported values of 1.8× 10-19 and 5.1× 10-20 cm2 for the π and polarizations of the conventional congruent-melt composition crystal through the branching ratio of emission spectra despite the different approach of calculations and difference in the near-stoichiometric and congruent-melt compositions. This fact shows that the slight difference in the host composition does not affect the cross section. The population inversion threshold is calculated to be 2.0× 1016 for the Nd (2 wt %) near-stoichiometric LiNb O3: Mg; Nd in the π polarization; the value of which is almost the same as that of 1.5× 1016 for Nd: Y3 Al5 O12; one of the representative laser materials. © 2006 American Institute of Physics;
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