Optimization of Wavefront Distortion of Direct Liquid-Cooled Thin-Disk Laser

Fig. 3. Optical path difference (OPD) distributions in gain medium and cooling fluid. (a) OPD distribution in gain medium; (b) OPD distribution in cooling fluid

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Fig. 4. Effect of microchannel height on OPD

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Fig. 5. Effect of gain medium thickness L_f on OPD

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Fig. 6. Effect of Reynolds number Re on OPD

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Fig. 7. Effect of thermal power density Q on OPD

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Fig. 8. Optimization of OPD by multivariate genetic algorithm

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Fig. 9. OPD distributions of gain medium and cooling fluid after optimization. (a) OPD distribution of gain medium; (b) OPD distribution of cooling fluid

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Table 1. Physical parameters of selected materials^[17-18]

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Table 1. Physical parameters of selected materials^[17-18]

Parameter	Content
Parameter	YAG	Deuteroxide
Chemical formula	Y₃Al₅O₁₂	D₂O
Thermal conductivity at 300 K /(W·m^－1·K^－1)	14	0.63
Specific heat capacity at 300 K /(J·kg^－1·K^－1)	590	4200
Melting point or boiling point /K	2240	373
Density /(kg·m^－3)	4560	1200
Poisson’s ratio	0.28
Young’s modulus /GPa	317
Breaking strength /GPa	130－260
Viscosity at 300 K /(mPa·s)		1.00
Refractive index at 1064 nm	1.82	1.33
Thermal expansion coefficient /K^－1	7.5×10^－6
Absorption coefficient at 1064 nm /cm^－1		0.016
Thermo-optic coefficient /K^－1	7.3×10^－6	－1.4×10^－4

Table 2. Initial design parameters of single gain disk and microchannel
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Table 2. Initial design parameters of single gain disk and microchannel
Item Length /mm Width /mm Height /mm Shrink ratio
Nd∶YAG 50 30 1.5
Microchannel 95 30 0.3 6

Table 3. Corresponding coefficients of control equations
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Table 3. Corresponding coefficients of control equations
Equation ϕ Γ_ϕ S_ϕ
Continuity equation 1 0 0
Momentum equation u，v，w μ $－ \frac{\partial p}{\partial x_{i}} ＋ S_{i}$
Energy equation T λ/C_p S_T

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Qianming Wei, Xu Ruan, Jiayu Yi, Yu Ma. Optimization of Wavefront Distortion of Direct Liquid-Cooled Thin-Disk Laser[J]. Chinese Journal of Lasers, 2022, 49(23): 2301005

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