Simulation and Optimization of Heat Dissipation in Slab Laser Amplifier Based on Microchannel Heat Sink

Haoran Wang; Jianlei Wang; Peili Li; Zhenxu Lu; Fuxiao Ma; Yunjie Ma; Jun Zhou; Weibiao Chen

doi:10.3788/CJL220976

Chinese Journal of Lasers, Volume. 50, Issue 7, 0701002(2023)

Simulation and Optimization of Heat Dissipation in Slab Laser Amplifier Based on Microchannel Heat Sink

Haoran Wang^1,2, Jianlei Wang^2,3、**, Peili Li^1、*, Zhenxu Lu¹, Fuxiao Ma¹, Yunjie Ma¹, Jun Zhou^2,3, and Weibiao Chen^2,3

Author Affiliations

¹College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, Jiangsu, China

²Nanjing Institute of Advanced Laser Technology, Nanjing 210038, Jiangsu, China

³Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

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Figures & Tables(15)

Fig. 1. Model of microchannel heat sink cooling gain medium. (a) Schematic; (b) full-size model created during simulation

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Fig. 2. Sizes of gain medium and pumping area

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Fig. 3. Transient variation of surface temperature of gain medium with time at different frequencies

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Fig. 4. Flow field distribution of cooling fluid and temperature distribution of whole system. (a) Top view; (b) side view

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Fig. 5. Temperature distributions of gain medium at different depths along X-axis

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Fig. 6. Effect of bottom plate thickness on $T_{m a x}$

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Fig. 7. Effects of microchannel height on $T_{m a x}$ and pressure loss

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Fig. 8. Effects of microchannel width on $T_{m a x}$ and pressure loss

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Fig. 9. Effect of spacing between two microchannels on $T_{m a x}$

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Fig. 10. Influence of inlet flow velocity on $T_{m a x}$

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Fig. 11. Equivalent heat transfer coefficient of microchannel cooling system under same heat source condition

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Fig. 12. Maximum temperatures under different equivalent heat transfer coefficients. (a) 37200 W/(m²·K); (b) 71500 W/(m²·K)

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Table 1. Physical parameters of each material used in model
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Table 1. Physical parameters of each material used in model
Property Nd∶YAG Cu Indium
Thermal conductivity $k / [W ∙ {(m ∙ K)}^{- 1}]$ 14 398 80
Specific heat $c_{p} / [J ∙ {(k g ∙ K)}^{- 1}]$ 590 383.1 243
Density $ρ / (k g ∙ m^{- 3})$ 4560 8954 7300

Table 2. Parameters used in thermal simulation of gain medium
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Table 2. Parameters used in thermal simulation of gain medium
Simulation parameter Value
Peak pump power $P / k W$ 56
Pump absorption coefficient $α / m^{- 1}$ 310
Pump pulse width $τ / μ s$ 230
Pump repetition rate $F / H z$ 20
Pump heat ratio $η$ 0.35

Table 3. Optimized value range for each parameter
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Table 3. Optimized value range for each parameter
Parameter Range
$H_{b} / m m$ 1-5
$H_{c} / m m$ 2-6
$W_{c} / m m$ 0.3-0.8，1.0，1.2
$W_{w} / m m$ 0.2-0.8，1.0，1.2
$V_{i n} / (m \cdot s^{- 1})$ 0.5-3.0

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Haoran Wang, Jianlei Wang, Peili Li, Zhenxu Lu, Fuxiao Ma, Yunjie Ma, Jun Zhou, Weibiao Chen. Simulation and Optimization of Heat Dissipation in Slab Laser Amplifier Based on Microchannel Heat Sink[J]. Chinese Journal of Lasers, 2023, 50(7): 0701002

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