Layer by layer exposure of subsurface defects and laser-induced damage mechanism of fused silica

Li, Bo; Hou, Chun-Yuan; Tian, Chengxiang; Guo, Jianlei; Xi, Xiang; Jiang, Xiaolong; Wang, Haijun; Liao, Wei; Yuan, Xiaodong; Jiang, Xiaodong; Zu, Xiaotao

doi:10.1016/j.apsusc.2019.145186

Cited by 41 publications

(9 citation statements)

References 39 publications

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“…The shallow absorptive defect lodging in the surface of film layer led to the higher temperature rise and thermal stress. This is in accordance with the conclusion that surface or subsurface defects are more likely to cause film damage [22]. Therefore, absorptive defects induce more serious laser damage of optical films through light field enhancement and the thermal-mechanical effect.…”

Section: Thermal-mechanical Effect Due To Light Field Intensificationsupporting

confidence: 91%

Revisiting Defect-Induced Light Field Enhancement in Optical Thin Films

2022

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Based on a finite-difference time-domain method, we revisited the light field intensification in optical films due to defects with different geometries. It was found that defect can induce the local light intensification in optical films and the spherical defects resulted in the highest light intensification among the defect types investigated. Light intensification can increase with defect diameter and the relative refractive index between the defect and the film layer. The shallow defects tended to have the highest light intensification. Finally, the extinction coefficient of the defect had a significant effect on light intensification. Our investigations revealed that the light field intensification induced by a nano-defect is mainly attributed to the interference enhancement of incident light and diffracted or reflected light by defects when the size of the defect is in the subwavelength range.

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Section: Thermal-mechanical Effect Due To Light Field Intensificationsupporting

confidence: 91%

Revisiting Defect-Induced Light Field Enhancement in Optical Thin Films

2022

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“… – 12 Increasing the LIDT of fibers has been a hot topic in the past decades 13 – 15 Since the fused silica is widely used in the optical fiber, 16 , 17 giving a theoretical analysis about LIDT of high-purity silica optical fiber is valuable for improving the fiber’s high-power laser transport capability 18 , 19 …”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12] Increasing the LIDT of fibers has been a hot topic in the past decades. [13][14][15] Since the fused silica is widely used in the optical fiber, 16,17 giving a theoretical analysis about LIDT of high-purity silica optical fiber is valuable for improving the fiber's high-power laser transport capability. 18,19 Initially, researchers studied the effect of different materials and laser properties on LIDT: the experiments show that the LIDT is related to the wavelength of the laser.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced damage threshold based on thermal effects in high-purity silica optical fiber

Lou

Jia

et al. 2023

Opt. Eng.

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.Laser-induced damage threshold (LIDT) is investigated at several wavelengths in the high-purity silica optical fiber. The finite element method (FEM) is used to study transmission mode, LIDT, temperature distribution, and thermal stress distribution of the fiber. Our results show that the center of the front surface is subjected to severe thermal effects under laser irradiation and consequently, and it is susceptible damage. The variations in temperature and thermal stress are identified as increasing with laser fluences, which show a similar tendency. When laser fluences surpass the LIDT, such as 35 GW / cm2, the temperature at the front surface center shows a sudden growth and the melting damage appears, and no stress damage occurs at this time. Notably, the melting effect of high purity fused silica optical fiber is simulated by numerical calculation based on ray optics for the first time. Our research can provide systematic FEM simulations for the LIDT of silica optical fibers.

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“…The optics damage has always been a limitation to improving the load capacity of high-power and high-energy laser facilities, such as the National Ignition Facility (NIF) and Laser Mega Joule (LMJ) [1], [2], [3] . Various damage mechanisms, such as electron avalanche, multiphoton ionization, impurity defects, and nonlinear damage, induce the deterioration of optical components under intense laser irradiation [4] . Among them, the damage caused by the nonlinear effects of highpower lasers in optical components occupies a prominent role [5], [6][7] [8] .…”

Section: Introductionmentioning

confidence: 99%

Simulation analysis of spatial transmission of backward stimulated Brillouin scattered light in high power laser facilities

et al. 2022

Seventeenth National Conference on Laser Technology and Optoelectronics

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Backward light by stimulated Brillouin scattering (SBS) induces the final transport mirror laser damage, which has been considered a bottleneck problem in developing high-power and high-energy laser facilities. In this work, an improved continuous phase plate (CPP) model and a backward SBS model were established based on the G-S algorithm and the Fresnel diffraction transmission algorithm to simulate the backward SBS to the final transport mirror. This study discussed the propagation characteristics of backward SBS. The research results showed that the distribution of the backward SBS transmitted to the final transport mirror was determined by the phase structure of the continuous phase plate attached to the back-transmission process. By optimizing the CPP design, reducing the transmission distance, reducing the intensity modulation, and controlling the phase of the incident beam, the modulation of backward SBS can be suppressed, which has great significance in improving the laser-induced damage threshold to the final transport mirror.

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Layer by layer exposure of subsurface defects and laser-induced damage mechanism of fused silica

Cited by 41 publications

References 39 publications

Revisiting Defect-Induced Light Field Enhancement in Optical Thin Films

Revisiting Defect-Induced Light Field Enhancement in Optical Thin Films

Laser-induced damage threshold based on thermal effects in high-purity silica optical fiber

Simulation analysis of spatial transmission of backward stimulated Brillouin scattered light in high power laser facilities

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