[1] D. C. Hanna, I. R. Perry, J. R. Lincoln. A 1-watt: thulium-doped CW fibre laser operating at 2 μm. Opt. Commun., 1990, 80(1):52～56

[2] Anne Tropper, Richard Smart. Thulium-doped silica fiber laser. Fiber Laser Source and Amplifiers, SAE, 1990, 1373:152～156

[4] Du Geguo, Liu Dongfeng, Wang Xianhua et al.. Frequency upconvertion in Tm-doped silica fibers in the visible rigion. Journal of Photons, 1996, 26:910～914

[5] B. James Ainslie, Susan P. Craig, Steven T. Davey. The absorption and Fluorescence spectra of rare earth ions in silica-based monomode fiber. J. Lightwave Technol., 1988, 6(2):287～296