A design of a surface-doped Yb:YAG slab laser with high power and high efficiency

Jiao Liu; Yang Liu; Xiaojun Tang; Chao Wang; Lei Liu; Lu Chen; Ning Li; Ke Wang; Xingbo Liang; Kunpeng Lü; Xue Yang; Hong Zhao; Nianjiang Chen

doi:doi:10.3788/COL201816.101401

Chinese Optics Letters, 2018, 16 (10): 101401, Published Online: Oct. 12, 2018

A design of a surface-doped Yb:YAG slab laser with high power and high efficiency Download： 1066次

Jiao Liu ^1,2Yang Liu ^1,2Xiaojun Tang ^1,2Chao Wang ^1,2,*Lei Liu ^1,2Lu Chen ^1,2Ning Li ^1,2Ke Wang ^1,2Xingbo Liang ^1,2Kunpeng Lü ^1,2Xue Yang ^1,2Hong Zhao ^1,2Nianjiang Chen ^1,2

Author Affiliations

¹ Institute of North Optics and Electronics, Beijing 100015, China

² Science and Technology on Solid-State Laser Laboratory, Beijing 100015, China

Figures & Tables

Fig. 1. Orthographic drawing of a surface-doped slab.

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Fig. 2. (a) Temperature distribution along the thickness at y=14, z=1.25; (b) temperature distribution along the length at x=0.27, y=14. The slab has outside dimensions of 28 mm width by 113.2 mm length by 2 mm thickness, consisting of a 0.27 mm-thickness Yb3+-doping surface with a concentration of 2 at. %, and the slab is double-end-pumped with a pump power of 30 kW at 940 nm.

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Fig. 3. Comparison of the highest temperature of the surface-doped slab and the normal bulk-doped slab over a wide pump power range.

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Fig. 4. Schematic diagram of the laser beam path in the slab.

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Fig. 5. Energy level scheme of the Yb:YAG laser system. The Boltzmann occupation factors of the Stark levels coupled by the pump radiation are denoted by fap and fbp. The Boltzmann occupation factors of the Stark levels coupled by the laser emission are denoted by fal and fbl.

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Fig. 6. Curves of the absorbed efficiency and the output power with different thicknesses of the doped region, when the pump power is 30 kW and the output coupler reflectivity R is 0.75.

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Fig. 7. Predicted laser output power and optical-optical conversion efficiency against the pump power with an output coupler reflectivity R of 0.75. The pump power at the lasing threshold is about 3.4 kW and the slope efficiency is 60.2%.

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Fig. 8. Schematic of the experimental setup.

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Fig. 9. Laser oscillator performance for a 48 J double-end-pumped surface-doped Yb:YAG slab laser.

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Jiao Liu, Yang Liu, Xiaojun Tang, Chao Wang, Lei Liu, Lu Chen, Ning Li, Ke Wang, Xingbo Liang, Kunpeng Lü, Xue Yang, Hong Zhao, Nianjiang Chen. A design of a surface-doped Yb:YAG slab laser with high power and high efficiency[J]. Chinese Optics Letters, 2018, 16(10): 101401.

A design of a surface-doped Yb:YAG slab laser with high power and high efficiency Download： 1066次

Fig. 1. Orthographic drawing of a surface-doped slab.

Fig. 3. Comparison of the highest temperature of the surface-doped slab and the normal bulk-doped slab over a wide pump power range.

Fig. 4. Schematic diagram of the laser beam path in the slab.

Fig. 5. Energy level scheme of the Yb:YAG laser system. The Boltzmann occupation factors of the Stark levels coupled by the pump radiation are denoted by fap and fbp. The Boltzmann occupation factors of the Stark levels coupled by the laser emission are denoted by fal and fbl.

Fig. 6. Curves of the absorbed efficiency and the output power with different thicknesses of the doped region, when the pump power is 30 kW and the output coupler reflectivity R is 0.75.

Fig. 7. Predicted laser output power and optical-optical conversion efficiency against the pump power with an output coupler reflectivity R of 0.75. The pump power at the lasing threshold is about 3.4 kW and the slope efficiency is 60.2%.

Fig. 8. Schematic of the experimental setup.

Fig. 9. Laser oscillator performance for a 48 J double-end-pumped surface-doped Yb:YAG slab laser.

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A design of a surface-doped Yb:YAG slab laser with high power and high efficiency Download： 1066次

Fig. 1. Orthographic drawing of a surface-doped slab.

Fig. 3. Comparison of the highest temperature of the surface-doped slab and the normal bulk-doped slab over a wide pump power range.

Fig. 4. Schematic diagram of the laser beam path in the slab.

Fig. 5. Energy level scheme of the Yb:YAG laser system. The Boltzmann occupation factors of the Stark levels coupled by the pump radiation are denoted by fap and fbp. The Boltzmann occupation factors of the Stark levels coupled by the laser emission are denoted by fal and fbl.

Fig. 6. Curves of the absorbed efficiency and the output power with different thicknesses of the doped region, when the pump power is 30 kW and the output coupler reflectivity R is 0.75.

Fig. 7. Predicted laser output power and optical-optical conversion efficiency against the pump power with an output coupler reflectivity R of 0.75. The pump power at the lasing threshold is about 3.4 kW and the slope efficiency is 60.2%.

Fig. 8. Schematic of the experimental setup.

Fig. 9. Laser oscillator performance for a 48 J double-end-pumped surface-doped Yb:YAG slab laser.

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