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Yi Chen

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SPIE Journal Paper | 6 September 2023

Thermodynamic damage behavior of single-crystal MgF₂ irradiated by high-power fiber laser

Jiamin Wang, Kuo Zhang, Jinghua Yu, Yi Chen, Changbin Zheng, Peng Yang, Guohui Bao, Fei Chen

OE, Vol. 62, Issue 09, 096102, (September 2023) https://doi.org/10.1117/12.10.1117/1.OE.62.9.096102

KEYWORDS: Laser irradiation, Windows, Thermodynamics, Magnesium fluoride, Laser induced damage, Optical simulations, Mirrors, Laser countermeasures, High power fiber lasers, Optical engineering

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Magnesium fluoride (MgF2) is a widely used optical window material in lasers. Laser-induced damage in MgF2 materials involves complex thermal-mechanical coupling issues. With the rapid development of high-power fiber laser technologies and application of optoelectronic countermeasures, it is necessary to investigate the damage mechanism of 1.06 μm high-power continuous-wave laser on MgF2 optical windows to clarify the laser damage threshold and factors influencing laser-irradiated MgF2 window mirrors. Therefore, based on the theory of heat conduction and elastic mechanics, a simulation study was conducted using the finite element method. First, based on the thermo-mechanical theory, established a thermo-mechanical damage model for a laser-irradiated MgF2 crystal. Second, we calculated the temperature, stress, and strain fields of single-crystal MgF2 material under the action of a 100 W / cm2 laser. When the laser was irradiated for 4.921 s, thermal stress-induced burst damage was observed, but no melting damage occurred. Finally, the impact of parameters such as the laser power density, spot size, and laser action time on the damage effect was discussed using the parametric scanning method. The calculation results showed that the aforementioned factors significantly impact the damaging effect. Moreover, under the same laser parameters, material burst due to thermal stress is expected to precede the melt damage.

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