[1] Zhang C, Zhang H N, Liu J. Characteristics of 2 μm pulse laser based on argentum nanorod saturable absorber[J]. Chinese Journal of Lasers, 44, 0703022(2017).

[2] Lin Q F, Xia H P, Wang J H et al. Effect of Ga2O3 on the spectroscopic properties of Tm 3+-doped GeO2-Ga2O3-Li2O-BaO-La2O3 glasses [J]. Acta Physica Sinica, 57, 2554-2561(2008).

[3] Gao S, Wang X, Fan X K et al. Spectroscopic properties of ~2 μm emissions of Tm 3+-doped germanate-tellurite glasses [J]. Acta Physica Sinica, 39, 139-142(2014).

[4] Qian G Q, Tang G W, Qian Q et al. Study on mid-infrared spectral properties of Ho 3+/Yb 3+ co-doped fluorogermanate glasses [J]. Acta Optica Sinica, 36, 0616002(2016).

[5] Wen X. Study on 2 μm barium gallo-germanate glass single-mode optical fiber[D]. Guangzhou: South China University of Technology, 20-40(2015).

[6] Zhen B, Xu S H, Mo S P et al. Study on the relaxtion oscillation supperession in a short cavity single frequency DBR fiber laser[J]. Laser & Optoelectronics Progress, 50, 090602(2013).

[7] Yang C S, Chen D, Zhao Q L et al. Research progress of 2.0 μm-band Tm-doped continuous wave single-frequency fiber lasers[J]. Chinese Journal of Lasers, 44, 0201006(2017).

[8] Fan X K. Spectroscopic and laser properties of 2-3 μm emissions in rare earth doped tellurite and germanate glasses and fibers[D]. Beijing: University of Chinese Academy of Sciences, 53-58(2015).

[9] Uhlmann D R. Glass formation[J]. Journal of Non-Crystalline Solids, 25, 42-85(1977).

[10] Cheng Y. Study on structure and crystallization of advanced borate glass[D]. Changsha: Hunan University, 10-28(2006).

[11] Wu Z Q, Cheng Y, Zhou W W et al. Effects of La2O3 content on thermostability and optical properties of Tm 3+-doped tellrite glasses [J]. Journal of Optoelectronic·Laser, 25, 897-902(2014).

[12] Min'ko N I, Varavin V V. Effect of water on the structure and properties of glass[J]. Glass & Ceramics, 64, 71-74(2007). http://link.springer.com/article/10.1007/s10717-007-0017-4

[13] Yue J, Xue T F, Li X et al. Research progress on dehydration techniques in mid-infrared heavy matal oxide glass[J]. Laser & Optoelectronics Progress, 51, 090002(2014).

[14] Jiang Z H[M]. New light functional glass, 34-38(2008).

[15] Carnall W T, Fields P R, Rajnak K. Electronic energy levels in the trivalent lanthanide aquo ions. I. Pr 3+, Nd 3+, Pm 3+, Sm 3+, Dy 3+, Ho 3+, Er 3+, and Tm 3+ [J]. Journal of Chemical Physics, 49, 4424-4442(1968). http://scitation.aip.org/content/aip/journal/jcp/49/10/10.1063/1.1669893

[16] Yang Z Y, Luo L, Chen W. Spectral analysis of rare-earth ions in solid luminescent materials[J]. Acta Optica Sinica, 27, 598-602(2007).

[17] Pauling L C[M]. The nature of the chemical bond, 30-35(1966).

[18] Wachtler M, Speghini A, Gatterer K et al. ChemInform abstract: optical properties of rare-earth ions in lead germanate glasses[J]. Cheminform, 81, 2045-2052(1998). http://onlinelibrary.wiley.com/doi/10.1002/chin.199844291/pdf

[19] Balda R, Fernández J, Arriandiaga M A et al. Effect of concentration on the infrared emissions of Tm 3+ ions in lead niobium germanate glasses [J]. Optical Materials, 28, 1253-1257(2006). http://adsabs.harvard.edu/abs/2006OptMa..28.1253B

[20] Doualan J, Girard S, Haquin H et al. Spectroscopic properties and laser emission of Tm doped ZBLAN glass at 1.8 μm[J]. Optical Materials, 24, 563-574(2003). http://www.sciencedirect.com/science/article/pii/S0925346703001447

[21] Wu T Y, Cheng Y, Wu Z Q et al. Effects of Tm 3+ ion concentration on the thermal stability and spectroscopic properties of tellurite glasses [J]. Bulletin of the Chinese Ceramic Society, 32, 583-588(2013).

[22] Geng J, Wu J, Jiang S et al. Efficient operation of diode-pumped single-frequency thulium-doped fiber lasers near 2 microm[J]. Optics Letters, 32, 355-357(2007). http://www.opticsinfobase.org/ol/abstract.cfm?id=125524

[23] Zhou Y W, Wang Q, Zhang Y D et al. Continuous wave operation of Tm2O3-doped germanate glass laser around 2 μm[J]. Chinese Journal of Lasers, 38, 0402004(2011).

[24] Zou X, Toratani H. Spectroscopic properties and energy transfers in Tm 3+ singly and Tm 3+/Ho 3+ doubly-doped glasses [J]. Journal of Non-Crystalline Solids, 195, 113-124(1996). http://www.sciencedirect.com/science/article/pii/0022309395005226

[25] Sousa D F D, Nunes L A O. Microscopic and macroscopic parameters of energy transfer between Tm 3+ ions in fluoroindogallate glasses [J]. Physical Review B, 66, 81-88(2002). http://journals.aps.org/prb/abstract/10.1103/PhysRevB.66.024207

[26] Li M. Spectroscopic properties of 2 μm emissions in rare-earth ions doped silicate glass[D]. Beijing: University of Chinese Academy of Sciences, 40-49(2014).