[1] Epstein R I, Buchwald M I, Edwards B C. Observation of laser-induced fluorescent cooling of a solid[J]. Nature, 1995, 377: 500.
[2] Egorov S A, Skinner J L. On the theory of multiphonon relaxation rates in solids[J]. J. Chem. Phys., 1995, 103: 1533.
[3] Clark J L, Rumbles G. Laser cooling in the condensed phase by frequency up-conversion[J]. Phys. Rev. Lett., 1996, 76: 2037.
[4] Mungan C E, Buchwald M I, Edwards B C. Laser cooling of a solid by 16K starting from room temperature[J]. Phys. Rev. Lett., 1997, 78: 1030.
[5] Gosnell T R. Laser cooling of a solid by 65K starting from room temperature[J]. Opt. Lett., 1999, 24: 1041.
[6] Lei G, Anderson J E, Buchwald M I. Determination of spectral linewidths by Voigt profiles in Yb-doped fluorozirconate glasses[J]. Phys. Rev., 1999, 57 (B): 7673.
[7] Lei G, Anderson J E, Buchwald M I. Spectroscopic evaluation of Yb-doped glasses for optical refrigeration[J]. IEEE J. Quantum Electron, 2000, 34: 1839.
[8] Lamouche G, Lavallard P, Suris R, et al. Low temperature laser cooling with a rare-earth doped glass[J]. J. App. Phys., 1998,84:509.