title: Crystal structure, Judd-Ofelt analysis, and spectroscopic assessment of a TmAl3(BO3)4 crystal as a new potential diode-pumped laser near 1.9 micron.
abstract: TmAl3(BO3)4 crystallizes in the trigonal system R32 (No. 155) with a = b = 9.2741(13) A, c = 7.218(3) A, alpha = beta = 90 degrees , gamma = 120 degrees , V = 537.7(2) A(3), D(c) = 4.494 g cm(-3), and Z = 3. The absorption spectrum of this crystal was recorded at room temperature. The Judd-Ofelt (J-O) theory was applied to the absorption intensities of TmAl(3)(BO3)4 to obtain the three J-O parameters: Omega(2) = 2.40 x 10(-20) cm(2), Omega(4) = 0.48 x 10(-20) cm(2), and Omega(6) = 1.09 x 10(-20) cm(2). The radiative probabilities, radiative lifetimes, and branching ratios of TmAl3(BO3)4 were calculated. The absorption and emission cross sections, together with the potential laser gain near 1.9 microm, were investigated. The potential laser gain curves indicate that the tunability range is about 200 nm.
authors.affiliation: Fujian Institute of Research on the Structure of Matter, State Key Laboratory of Structural Chemistry, National Engineering Research Center for Optoelectronic Crystalline Materials, Chinese Academy of Sciences, Fuzhou, Fujian, People's Republic of China.
authors.forename: Guohua
authors.initials: G
authors.lastname: Jia
authors.forename: Chaoyang
authors.initials: C
authors.lastname: Tu
authors.forename: Jianfu
authors.initials: J
authors.lastname: Li
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: You
authors.forename: Zhaojie
authors.initials: Z
authors.lastname: Zhu
authors.forename: Baichang
authors.initials: B
authors.lastname: Wu