High Power Laser Science and Engineering, Volume. 10, Issue 6, 06000e42(2022)
Multilayer dielectric grating pillar-removal damage induced by a picosecond laser
Fig. 1. (a) Schematic representation of the MLDG and (b) the –1st-order diffraction efficiency of the MLDG; the inset shows an SEM image of the pristine cross-sectional morphology of the MLDG. The measured grating period
Fig. 2. Damage probability fitting curve of MLDGs under one-on-one test mode. The LIDT of the MLDGs was 2.2 J/cm2 irradiated by an 8.6 ps-pulsed laser with the wavelength of 1053 nm.
Fig. 3. SEM images of typical damage morphology characteristics of the MLDGs. (a) Top-view image of the damage area irradiation by the ps-pulsed laser, and (b)–(d) are the local magnified views of the three black rectangular areas in (a). The test laser irradiated the surface from left to right with a fluence of 3.3 J/cm2.
Fig. 4. Two-dimensional finite-element strain simulation model and calculation results. (a) Schematic representation of the eruptive impact process; the localized eruption of the left-hand pillar induced a rightward impact pressure on the right-hand pillar. (b), (c) Normal stress distributions along the
Fig. 5. (a) Schematic representation of the electric field simulation model and (b) laser electric field distribution in MLDGs. The incident laser pulse is centered at 1053 nm, and its pulse width is 8.6 ps.
Fig. 6. Evolution of the electronic density in the conduction band. The rectangular, circular and triangular shapes represent the sampling point curves on the upper inset image. The calculation time is three times that of the laser pulse width.
Fig. 7. Calculation of the eruptive pressure in the MLDGs. The time step adopted was 10% that the pulse width. (a) Evolution of the eruptive pressure distribution on the right-hand side ridge and (b) distribution of the eruptive pressure in the grating when The red line in the inset image indicates the sampling boundary for eruptive pressure in (a).
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Kun Shuai, Xiaofeng Liu, Yuanan Zhao, Keqiang Qiu, Dawei Li, He Gong, Jian Sun, Li Zhou, Youen Jiang, Yaping Dai, Jianda Shao, Zhilin Xia. Multilayer dielectric grating pillar-removal damage induced by a picosecond laser[J]. High Power Laser Science and Engineering, 2022, 10(6): 06000e42
Category: Research Articles
Received: Sep. 3, 2022
Accepted: Oct. 27, 2022
Posted: Oct. 28, 2022
Published Online: Dec. 23, 2022
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