Simulation and Experimental Research on the Temperature Rise of Optical Elements Based on Surface Absorptivity

doi:10.12382/bgxb.2024.0691

Abstract

Abstract:

The surface absorptivity of optical elements is the main factor causing the abnormal temperature rise under continuous laser irradiation. Research has found that the surface absorptivity of optical elements is influenced by multiple factors and exhibits nonlinear variations. Therefore, a concept of equivalent surface absorptivity is proposed to characterize the comprehensive absorption performance of optical elements for laser. Firstly, a finite element model of the optical element irradiated by Gaussian continuous laser is established to simulate the temperature rise process of optical elements under laser irradiation, and a laser irradiation effect experimental system is established. The surface absorptivity, surface morphology and temperature rise process of surface center point of optical elements are measured, tested and analyzed, and the correctness of the prtoposed model is verified by the experimental results. Based on the experimental results, the model parameters are adjusted to obtain the equivalent surface absorptivity of the optical element for laser. The research show that the simulated error of equivalent surface absorptivity is smaller and its simulated precision is higher compared with the measured surface absorptivity, The research results provide reference for the state monitoring of optical element and the pollution prevention and control.

Key words: optical element, surface absorptivity, continuous laser, temperature rise experiment

CLC Number:

TN249

ZHANG Hetian, ZENG Yaqin, SUN Shiyan, CHEN Zhong, WANG Liang. Simulation and Experimental Research on the Temperature Rise of Optical Elements Based on Surface Absorptivity[J]. Acta Armamentarii, 2025, 46(5): 240691-.

Figures/Tables 16

Fig.1 Two-dimensional axisymmetric model of optical element irradiated by laser

Table 1 Thermophysical parameters of optical element material[24-25]

参数	参数
参数	ZrO₂	SiO₂	熔石英
热导率k/(W·cm^-1·K^-1)	0.0178	0.013	0.0138
密度ρ/(g·m^-3)	5.58	2.32	2.20
比热容C/(J·g^-1·K^-1)	0.474	0.35	0.703
熔点T_m/K	2680	1973	1730

Fig.2 Surface center temperature of model over time under different mesh division schemes

Fig.3 D-value between the temperature rise calculated results of ultrafine mesh and different meshes

Fig.4 Finite element mesh model

Fig.5 Laser irradiation effect experimental system

Table 2 Laser parameters

功率挡位	光斑半径r₀/mm	激光功率密度I₀/(kW·cm^-2)
探测光	1	2
试验光	1	255

Fig.6 Absorptivity distribution of the measured surface areas on the different lenses

Table 3 Surface absorptivity distribution of different lenses

参数	无污染镜片		有污染镜片
参数	Ⅰ	Ⅱ	Ⅲ	Ⅳ
最大表面吸收率 A_max/10^-6	40.92	87.32	124.68	144281.04
平均表面吸收率 A_avg/10^-6	7.12	5.07	7.26	23353.69
A_max/A_avg	5.75	17.23	17.17	6.18

Fig.7 Surface images of different lenses under the microscope

Fig.8 Surface images of lens during laser irradiation

Fig.9 Surface images of different lenses after laser irradiation under the microscope

Fig.10 Experimental and simulat temperature-time curves of measured surface absorptivity

Fig.11 Equivalent surface absorptivity curve with time of different lenses

Fig.12 Temperature-time curve of experimental and simulated equivalent surface absorptivity

Table 4 Error between simulated data and experimental data of different lenses%

参数	无污染镜片		有污染镜片
参数	Ⅰ	Ⅱ	Ⅲ
θ_A_avg	0.20	0.25	4.02
$θ A t$	0.03	0.03	0.04

Table 4 Error between simulated data and experimental data of different lenses%

参数	无污染镜片		有污染镜片
参数	Ⅰ	Ⅱ	Ⅲ
θ_A_avg	0.20	0.25	4.02
$θ A t$	0.03	0.03	0.04

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