Abstract：In this article, a good-quality crystal Yb:YAG was grown by pull method, and its absorption spectrum of 200-3 000 nm was measured at room temperature. Its absorption of 200-300 nm is from the host YAG, and there ｅｘｉｓｔｓ only the characteristic absorption of Yb3+ in the range of 390-3 000 nm. Judd-Ofelt theory computation indicates that the absorption and emission oscillator strengthｓ of electric dipole of (24 at%)Yb:YAG are 3.58×10-6 and 4.77×10-6, ｒｅｓｐｅｃｔｉｖｅｌｙ，and the absorption and emission transition probabilities are 879 and 1 171／s ｒｅｓｐｅｃｔｉｖｅｌｙ. As for magnetic dipole, the absorption and emission oscillator strengths are 3.32×10-7 and 4.43×10-7 ｒｅｓｐｅｃｔｉｖｅｌｙ, and the absorption and emission transition probabilities are 82 and 109／s ｒｅｓｐｅｃｔｉｖｅｌｙ. The lifetime of the energy level 2F5／2 is 781 μs.
Key words：Absorption spectrum;Laser crystal;Crystal growth;Yb:YAG;Judd-Ofelt theory
[1] Reinberg A R, Risenberg L A, Brown R M et al. Appl. Phys. Lett., 1971，19：11. [2] Hōnnínger C, Paschotta R et al. Appl. Phys. B, 1999, 69：3. [3] Todd S Rutherford, William M Tulloch, Eric K Gustafson et al. IEEE J. Quantum Electronics, 2000，36：205. [4] Weber M J, Varitimos T E, Matsinger B H. Phys. Rev., 1973，B8(1)：47. [5] Pujol Maria Cinta, Massons aume J, Aguiló Magdalena et al. IEEE J. Quantum Electronics, 2002，38(1)：93. [6] Aghamalyan N R, Kostanyan R B，Sanamyan T V. J. Phys. Condens. Matter, 2001，13：6585. [7] Weber Ｍ Ｊ. Phys. Rev., 1967，157(2)：262. [8] Patel Falgun D, Honea Eric C, Speth Joel ｅｔ ａｌ. IEEE J. Quant. Electr., 2001，37(1)：135. [9] Gaird Ｊ Ａ. IEEE J. Quant. Electr., 1975，QE-11(11)：874.
