Numerical simulations of thermal lens effect in K9 glass induced by millisecond laser irradiation

Yuxiang Sun; Hongchao Zhang; Yunxiang Pan; Jian Lu; Xiaowu Ni

doi:10.1117/12.2521285

29 March 2019 Numerical simulations of thermal lens effect in K9 glass induced by millisecond laser irradiation

Yuxiang Sun, Hongchao Zhang, Yunxiang Pan, Jian Lu, Xiaowu Ni

Proceedings Volume 11046, Fifth International Symposium on Laser Interaction with Matter; 110461W (2019) https://doi.org/10.1117/12.2521285
Event: Fifth International Symposium on Laser Interaction with Matter, 2018, Changsha, China

Abstract

Non-uniform temperature field in optical transparent glasses induced by high power Gaussian laser irradiation would introduce temperature gradient which will cause thermal lens effects inside materials. Such thermal lens influences on long pulse laser processing are usually omitted in previous studies. However, thermally-induced refractive index change in situ could have a relatively large impact on subsequent incident laser especially under the action of high power laser. In order to obtain a quantitatively transient results of thermal lens effects caused by long pulse laser, we carried out numerical simulations of temperature rise, refractive index change and their influences on light trail in K9 glass heated by a millisecond pulse laser. Different laser energy and glass thickness were applied to reveal the dependence of thermal lens and laser and glass parameters. Results show that the thermal lens effects would increase refractive index in K9 glass and reconverge subsequent laser beam consequently whose amplitude is proportional to incident laser power and glass thickness. The simulation results are compared with the previous experimental results and are consistent in magnitude of refractive index change. But there is a certain gap in refractive index field distribution in the direction of laser radius due to the neglect of influence of refractive index raise to susequent lasers in temperature simulations. This work would provide a reference in the field of millisecond pulse laser processing optical transparent materials.

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Yuxiang Sun, Hongchao Zhang, Yunxiang Pan, Jian Lu, and Xiaowu Ni "Numerical simulations of thermal lens effect in K9 glass induced by millisecond laser irradiation", Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110461W (29 March 2019); https://doi.org/10.1117/12.2521285

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KEYWORDS

Glasses

Refractive index

Thermal effects

Pulsed laser operation

Numerical simulations

Optical simulations

Laser irradiation

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