Enmao Song, Guangzhi Zhu, Hailin Wang, Hantian Chen, Yefeng Qian, Kozlov Aleksei, Xiao Zhu. Up conversion and excited state absorption analysis in the Tm:YAG disk laser multi-pass pumped by 1 μm laser[J]. High Power Laser Science and Engineering, 2021, 9(1): 010000e8
- High Power Laser Science and Engineering
- Vol. 9, Issue 1, 010000e8 (2021)
Fig. 1. Energy diagram of a Tm:YAG crystal.
Fig. 2. Fluorescence spectrum of a Tm:YAG crystal.
Fig. 3. Layout of the (a)20-pass pumping head and (b) 2 μm Tm:YAG disk laser multi-pass pumped by a 1 μm laser.
Fig. 4. Absorption cross section of Tm:YAG and spectrum of pump light. Inset is the spectrum of output laser.
Fig. 5. Absorbed pump power of a Tm:YAG crystal versus input pump power under non-lasing and lasing conditions for 0.5 and 1 mm thickness of gain medium.
Fig. 6. Output power of a Tm:YAG disk laser versus absorbed pump power for 0.5 and 1 mm thickness of gain medium. The inset shows the measured beam caustic and calculated beam quality at the output power of 1.05 W.
Fig. 9. Proportions of all the transitions for (a) 0.5 mm Tm:YAG disk laser and (b) 1 mm Tm:YAG thick disk laser under the lasing condition.
Fig. 10. Fractional thermal loads of all transitions for (a) 0.5 mm Tm:YAG disk laser and (b) 1 mmTm:YAG thick disk laser under the lasing condition.
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Table 1. The branch ratios of a Tm:YAG crystal in the 1G4 state.
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Table 2. Basic parameters used for the model.
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