Influence of surface cracks on laser-induced thermal damage characteristics of optical material

Xie, Yanxin; Lei, Qi; Liu, Yali; Zhang, Rongzhu

doi:10.1016/j.ijleo.2019.03.059

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…11,12 However, even if a small amount of absorbed laser energy is deposited in the materials as heat, the materials will be damaged due to the thermal melting or mechanical crack. [36][37][38] In comparison with the 3ω transparent glasses, all the 1ω absorptive glasses have a relative higher absorption coefficient (0.03-0.04 cm -1 ) at 355 nm due to relatively higher concentration of Fe 3+ ions and resultant absorption in UV range, which leads to relatively more thermal energy to be deposited in the glass volume and makes the probability of heat-induced damage increased. As a result, their LIDTs are all lower than those of 3ω transparent glasses.…”

Section: F I G U R Ementioning

confidence: 99%

Enhancement of UV laser‐induced damage resistance of the fluoride‐containing phosphate glasses by regulating the intrinsic defects

Wan

et al. 2021

J Am Ceram Soc.

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Low fluorine content containing fluorophosphate glasses have promising potential as ultraviolet (UV) optics to be used in high-energy laser systems. Systematic studies on the iron-doped and iron-free fluoride-containing phosphate glasses that were prepared at high and low melting temperatures explore the underlying interrelationship among the glass preparation conditions, intrinsic defects in produced glasses, and the anti-laser-damage properties. For the iron-doped fundamental frequency (1ω) absorptive glass, melting at high-temperature (1200 • C) can reduce the extrinsic "impurity" concentration of Fe 3+ ions, resulting in tiny increase of optical bandgap (by 1.6%) but significant reduce of the absorption coefficient by 34% at 355 nm. However, only tiny increase of the laser-induced damage threshold (LIDT) was achieved. For the iron-free third harmonic frequency (3ω) transparent glass, low-temperature (1000 • C) melting process significantly reduced the absorptive intrinsic defects content of PO 3 -EC, PO 4 -EC, and phosphorous oxygen-bonded hole center defects, which made the UV absorption edge blue-shifted by 50 nm and the optical bandgap increased by ∼18%. The UV (355 nm) LIDT was significantly enhanced by ∼27%. Much lower absorption coefficient and larger bandgap of the iron-free glass relative to the iron-doped one endow it with larger a LIDT. In short, optimizing the glass melting temperature is a feasible method to enhance the UV laser-induced damage resistance of the fluoride-containing phosphate glasses through controlling the content of the extrinsic or intrinsic defects in produced glasses. The general routine is to achieve both the lower UV absorptive defect concentration (i.e., lower UV absorption at 355 nm) and the lower non-bridged oxygen ratio (i.e., denser glass network), as well as a larger optical bandgap (i.e., reduced probability of avalanche ionization breakdown), which together contribute to the enhancement of the anti-laserdamage performance of the investigated fluoride-containing phosphate glasses.

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Section: F I G U R Ementioning

confidence: 99%

Enhancement of UV laser‐induced damage resistance of the fluoride‐containing phosphate glasses by regulating the intrinsic defects

Wan

et al. 2021

J Am Ceram Soc.

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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%

“…[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. 20 From a material perspective, researchers predicted that the LIDT is related to the band gap and found that for the same materials, the LIDT is a linear function of the band gap under single-pulse irradiation.…”

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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“…Yang et al [26] employed the 3D-FDTD method to simulate the electric field intensity distribution in the vicinity of particulate contaminants on fused silica surface. Xie et al [27] established a thermal damage analysis model of fused silica materials with surface crack to calculate the distributions of modulated light and temperature field on the optical surface based on the FDTD method. The abovementioned studies mainly focused on the effects of surface defects or repaired topography produced by non-evaporative mitigation on laser modulation, and most of them are of twodimensional simulations.…”

Section: Introductionmentioning

confidence: 99%

Optical modulation of repaired damage site on fused silica produced by CO₂ laser rapid ablation mitigation*

Tan¹,

Zhao²,

Chen³

et al. 2020

Chinese Phys. B

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CO2 laser rapid ablation mitigation (RAM) of fused silica has been used in high-power laser systems owing to its advantages of high efficiency, and ease of implementing batch and automated repairing. In order to study the effect of repaired morphology of RAM on laser modulation and to improve laser damage threshold of optics, an finite element method (FEM) mathematical model of 351 nm laser irradiating fused silica optics is developed based on Maxwell electromagnetic field equations, to explore the 3D near-field light intensity distribution inside optics with repaired site on its surface. The influences of the cone angle and the size of the repaired site on incident laser modulation are studied as well. The results have shown that for the repaired site with a cone angle of 73.3°, the light intensity distribution has obvious three-dimensional characteristics. The relative light intensity on z-section has a circularly distribution, and the radius of the annular intensification zone increases with the decrease of z. While the distribution of maximum relative light intensity on y-section is parabolical with the increase of y. As the cone angle of the repaired site decreases, the effect of the repaired surface on light modulation becomes stronger, leading to a weak resistance to laser damage. Moreover, the large size repaired site would also reduce the laser damage threshold. Therefore, a repaired site with a larger cone angle and smaller size is preferred in practical CO2 laser repairing of surface damage. This work will provide theoretical guidance for the design of repaired surface topography, as well as the improvement of RAM process.

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Influence of surface cracks on laser-induced thermal damage characteristics of optical material

Cited by 6 publications

References 7 publications

Enhancement of UV laser‐induced damage resistance of the fluoride‐containing phosphate glasses by regulating the intrinsic defects

Enhancement of UV laser‐induced damage resistance of the fluoride‐containing phosphate glasses by regulating the intrinsic defects

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

Optical modulation of repaired damage site on fused silica produced by CO₂ laser rapid ablation mitigation*

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Influence of surface cracks on laser-induced thermal damage characteristics of optical material

Cited by 6 publications

References 7 publications

Enhancement of UV laser‐induced damage resistance of the fluoride‐containing phosphate glasses by regulating the intrinsic defects

Enhancement of UV laser‐induced damage resistance of the fluoride‐containing phosphate glasses by regulating the intrinsic defects

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

Optical modulation of repaired damage site on fused silica produced by CO2 laser rapid ablation mitigation*

Contact Info

Product

Resources

About

Optical modulation of repaired damage site on fused silica produced by CO₂ laser rapid ablation mitigation*