UV laser conditioning of the sol-gel SiO2 film coated fused silica optics

Jiang, Yilan; Chen, Jing; Yang, Ke; Jiang, Yong; Liao, Wei; Zhang, Chuanchao; Ye, Yayun; Luan, Xiaoyu; Wang, Haijun; Jiang, Xiaolong; Yuan, Xiaodong; Zhang, Lijuan

doi:10.1016/j.ijleo.2017.03.112

Cited by 16 publications

(7 citation statements)

References 18 publications

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“…Sol–gel‐derived porous silica has been widely used in inertial confinement fusion (ICF) as the antireflection film 17–21 and it worked under gamma irradiation, which is generated from fusion reactor. It has been found that gamma irradiation can induce serious degradation of silicate material.…”

Section: Introductionmentioning

confidence: 99%

“…9 Sahi et al studied the primary irradiation damage of α-iron by molecular dynamics (MD) method and found that the number of defects in the structure increases with the increase of irradiation energy. 15 Sol-gel-derived porous silica has been widely used in inertial confinement fusion (ICF) as the antireflection film [17][18][19][20][21] and it worked under gamma irradiation, which is generated from fusion reactor. It has been found that gamma irradiation can induce serious degradation of silicate material.…”

Section: Introductionmentioning

confidence: 99%

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Gamma‐ray irradiation effect on microstructure and physical performances of porous silica

et al. 2023

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In this paper, the gamma irradiation effect on the microstructure and physical performances of porous silica, including mechanical, thermal, and optical performances, are systematically investigated by using molecular dynamics and density‐functional theory‐based methods. The study of bond angle distribution, pair distribution function, coordination number distribution, and average ring size distribution show that, after gamma‐ray irradiation, the microstructure of porous silica is obviously modified. The tight packing of SiO2 tetrahedrons in the porous silica network is broken by gamma‐ray irradiation. Defects of three‐coordinated Si and non‐bridging oxygen are induced by gamma‐ray irradiation. Moreover, we find that the defects concentrations rapidly grow as gamma‐ray dose increases. The mechanical, thermal, and optical performances of porous silica are all seriously degenerated by gamma‐ray irradiation. Our results show that, for mechanical performance, Young's modulus, Bulk modulus, and Shear modulus first decrease and then keep stable as gamma‐ray dose increases, but the change of Poisson's ratio is slight. For thermal performance, the thermal conductivity decreases exponentially as gamma‐ray dose increases. For optical performance, light absorption coefficients increase exponentially and light transmittance drops as gamma‐ray dose increases in the working range (photon energy range around 3.5 eV) of inertial confinement fusion. Present work is expected to be valuable for studying the degradation mechanism of silicate materials under gamma radiation and developing gamma‐ray irradiation protection technology.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gamma‐ray irradiation effect on microstructure and physical performances of porous silica

et al. 2023

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“…13 For inertial confinement fusion (ICF), sol-gel-derived porous silica is widely used as antireflection film. [16][17][18][19][20][21] Similar to other nuclear materials, porous silica is worked under the radiation of high fluence neutron. In recent years, some experimental investigations about the neutron irradiation-induced structural and physical properties changes of silica [22][23][24][25][26][27][28] have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…For inertial confinement fusion (ICF), sol–gel‐derived porous silica is widely used as antireflection film 16–21 . Similar to other nuclear materials, porous silica is worked under the radiation of high fluence neutron.…”

Section: Introductionmentioning

confidence: 99%

Neutron irradiation effect on amorphous porous silica

et al. 2022

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Porous silica is widely used as antireflection films in inertial confinement fusion facilities and be irradiated by high fluence neutron. To date, the neutron irradiation effect of amorphous porous silica is still unclear. In this paper, we give a comprehensive insight into neutron irradiation effect on microstructure, mechanical, and optical properties of porous silica under 14 MeV neutron irradiation by using molecular dynamics and density-functional theory-based methods. We find that, for microstructure, neutron irradiation elongates Si-O bond distance, obviously reduces the max value of Si-O-Si bond angle, coordination number distribution, and increases Si 3+ and non-bridging oxygen defects. The bulk modulus, shear modulus, and Young's modulus are all obviously reduced due to neutron irradiation, but Poisson's ratio changes relatively small. The light transmittance is reduced, and the optical absorption coefficient is increased after neutron irradiation, especially in the photon energy range of 3-4 eV, which is detrimental to the resistance of laser-induced damage. Moreover, we find that neutron irradiation has more influence on high-porosity porous silica than lowporosity porous silica, which is mainly due to the higher defect percentage in high porosity. Present work is expected to be valuable in the study of degradation mechanism of nuclear material under neutron radiation.

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“…These effects will decrease the laser induced damage threshold (LIDT) of SiO2 thin film, therefore affect the performance of optical systems under high laser power irradiation. Many thin film modification methods have been proposed to improve the LIDT of SiO2 thin film, including thermal annealing [27], plasma treatment [28,29] and laser conditioning [30][31][32]. Among them, femtosecond laser conditioning mainly belongs to non-thermal transition [33], therefore is less likely to cause serious thermal damage to the interior of materials than nanosecond laser pulse.…”

Section: Introductionmentioning

confidence: 99%

Properties of femtosecond laser modified atomic layer deposition SiO2 films and their resistance to nanosecond ultraviolet lasers

Yuan¹,

Geng²,

Zhang³

et al. 2022

Advanced Laser Processing and Manufacturing VI

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The point defects exist in the SiO2 thin films can cause high absorption, which is known to be responsible for laser induced damage of the films under high power nanosecond (ns) laser irradiation. Laser conditioning of the film is beneficial to eliminate the film defects and improve the ability of films to resist ultraviolet (UV) ns laser damage. In this article, femtosecond laser is proposed to modify the SiO2 films in the hope of improving the damage resistance of films to UV lasers. After femtosecond laser conditioning, the film properties of ALD SiO2 films were characterized in terms of surface morphology, UV laser damage induced threshold (LIDT) and optical properties. The results show that significant improvement in laser damage resistance is achieved after femtosecond laser conditioning, the LIDT of the 300 nm SiO2 thin film increased from 1.55 J/cm2 to 16.69 J/cm2, and the LIDT of the 600 nm SiO2 thin film increased from 2.01 J/cm2 to 9.46 J/cm2.

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UV laser conditioning of the sol-gel SiO2 film coated fused silica optics

Cited by 16 publications

References 18 publications

Gamma‐ray irradiation effect on microstructure and physical performances of porous silica

Gamma‐ray irradiation effect on microstructure and physical performances of porous silica

Neutron irradiation effect on amorphous porous silica

Properties of femtosecond laser modified atomic layer deposition SiO2 films and their resistance to nanosecond ultraviolet lasers

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