Modeling for the thermal stress damage of the optical elements induced by high energy laser

Lou, Zhaokai; Han, Kai; Chen, Minsun; Yan, Binbin; Yang, Yi; Líu, Hao; Chen, Jian; Li, Xiao

doi:10.1117/12.2505380

Cited by 2 publications

(1 citation statement)

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“…studied single-shot damage in MgF2 irradiated by an 800 nm femtosecond laser and found that both multiphoton and avalanche ionization play an important role in femtosecond laser-induced damage in MgF2. Lou et al 16 . explored the thermodynamic damage mechanism caused by pollutants, and numerically simulated the temperature and stress fields of optical components irradiated by a 3.8 μm hollow rectangular high-power continuous wave (CW) laser.…”

Section: Introductionmentioning

confidence: 99%

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

Wang,

Zhang,

et al. 2023

Opt. Eng.

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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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