Determination of lithium positions in the crystal structure of lithium-modified Ca3Nb2Ga3O12 laser garnet
Disordered Yb:Ca3Nb1.5Ga3.5O12 (CNGG) garnets are ultrashort pulse lasers due to the relatively broad Yb emission bandwith. In the Ia-3d garnet structure Ca occupies 24c sites, and Nb and Ga are mainly in 16c and 24d, furthermore, to maintain charge neutrality, vacancies in the three positions as well as antisited Nb and Ga are present. Yb replaces Ca, and the diverse site substitutions with cations of different size and charge around YbO8 offers the possibility of a record broadening of Yb optical bands. However, the Yb incorporation into CNGG is limited by the electric charge mismatch with Ca. This incorporation is favored by doping with monovalent alkalis, i.e., 2 Ca substituted by a pair A-Yb. Notwithstanding the relevance of Li-modified Yb:CNGG (CLNGG) crystals, which support laser pulses as short as 55 fs, there is not a experimentally confident structural model for cations and vacancies distributions in CLNGG. Thus, precise D9 neutron diffraction data are expected to clarify questions concerning the nature of Li sites and the relative cationic contents over crystal sites. This model will guide future modifications to enhance the Yb optical bandwidth beyond the present limits
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C. Cascales; Castellano-Hernandez Elena; FERNANDEZ DIAZ Maria Teresa; SERRANO Dolores and ZALDO Carlos. (2016). Determination of lithium positions in the crystal structure of lithium-modified Ca3Nb2Ga3O12 laser garnet. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-11-417
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