Acta Optica Sinica, Volume. 42, Issue 5, 0514001(2022)
Design and Thermal Effect Analysis of LD Pumped Er,Yb∶glass Slab Multi-pass Amplifier
Figures & Tables(11)
Fig. 3. Relationship between output energy and pump power in multi-pass amplifier
Fig. 4. Three-dimensional temperature distribution of the slab medium on the y-z plane at different pump modes. (a) Single-ended pump; (b) dual-ended pump
Fig. 6. Thermodynamic results at different pump power. (a) Maximum temperature; (b) maximum stress
Fig. 7. Thermodynamic results along the z axis at different pump beam waist radius. (a) Temperature distribution; (b) stress distribution
Table 1. Parameters used in the simulation
View tableTable 1. Parameters used in the simulation
Parameter Value Energy level degeneracy γ=2 Stimulated emission cross section σe=0.8×10-20 cm2 Fluorescence lifetime τf=7.9 ms Quantum efficiency ηq=0.95 Stokes factor ηs=0.606 Pump absorption efficiency ηabs=0.95 Incident seed energy density Din=140 J/m2 Laser beam cross section area S=0.5 mm2 Gain length l≈200 mm
Table 2. Physical characteristic parameters of the Er,Yb∶glass laser medium
View tableTable 2. Physical characteristic parameters of the Er,Yb∶glass laser medium
Parameter Value Thermal conductivity K=0.85 W/(m·K) Young’s Modulus E=67 GPa Poisson ratio μ=0.24 Thermal expansion coefficient αT=8.8×10-6 K-1 Thermal optical coefficient dn/dt=-2.1×10-6 K-1 Cooling water temperature Tc=18 ℃ Room temperature T0=22 ℃ Convective heat coefficient of air h0=27.5 W/(m2·K) Pump beam waist radius ω0=400 μm Thermogenesis efficiency η=0.3935 Absorption coefficient α=6 cm-1 Refractive index n=1.532
Table 3. Geometric parameters of Er,Yb∶glass slab sample
View tableTable 3. Geometric parameters of Er,Yb∶glass slab sample
Sample Length L /mm Width w /mm Thickness t /mm 1 30 4 1 2 30 5 1 3 30 5 1.2 4 30 5 1.6
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Kexin Zhang, Kaixin Wang, Chunqing Gao. Design and Thermal Effect Analysis of LD Pumped Er,Yb∶glass Slab Multi-pass Amplifier[J]. Acta Optica Sinica, 2022, 42(5): 0514001
Paper Information
Category: Lasers and Laser Optics
Received: Aug. 3, 2021
Accepted: Sep. 8, 2021
Published Online: Mar. 8, 2022
The Author Email: Chunqing Gao (gao@bit.edu.cn)
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