Prevention of laser damage precursors in spaceborne ultraviolet antireflection coatings

Alig, Thimotheus; Bartels, Nils; Allenspacher, Paul; Balasa, Istvan; Böntgen, Tammo; Ristau, Detlev; Jensen, Lars

doi:10.1364/oe.418368

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…The calculated damage density is then used to compare laser optics manufactured with different coating or cleaning parameters and to assist in the parameter choice for the next manufacturing run in a looped optimization process. While we have previously reported details on the particle mitigation strategy [9], this work focuses in more detail on the test method and the information that can be obtained from a computerized data evaluation in large area raster scans. Furthermore, we compare improved laser optics (meaning optics manufactured using particle mitigation schemes) to optics manufactured via conventional IBS sputtering in tests of laser-induced contamination.…”

Section: Icso 2020 International Conference On Space Opticsmentioning

confidence: 99%

“…Details on the manufacturing of laser-optics have been reported previously [9]. produce anti-reflective (AR) optical coatings at 355 nm.…”

Section: Manufacturing Of Optical Coatings and Particle Mitigation Schemesmentioning

confidence: 99%

“…Additionally, the improvement of the damage threshold has also been demonstrated in ramped raster scan tests as reported earlier. [9] Figure 7: Improvement of the detected damage density during the optimization process of the particle mitigation scheme.…”

Section: Virtual Conference 30 March-2 April 2021mentioning

confidence: 99%

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Laser-induced damage and contamination testing for the next generation of LIDAR space optics

Bartels

Allenspacher

Alig

et al. 2021

International Conference on Space Optics — ICSO 2020

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We have recently reported a method to improve the laser-induced damage threshold of UV laser optics by mitigating damage precursors (nano-sized absorbers) during the manufacturing of ion-beam sputtered, anti-reflective optical coatings. To further optimize parameters of the coating and particle mitigation schemes, we had to assess the damage resistance of laser optics with a low density of damage precursors. This was achieved using large area raster scans in which a highintensity laser beam was scanned over the optical surface. Via image processing of microscopic data, we then derived the density and size distribution of laser-induced damages for each raster scan. This advanced test method is described in this work and prepared the path to the manufacturing of improved laser optics that can be used to increase the performance and reliability of lasers in future space missions. Furthermore, we report on the comparison of standard and improved laser optics in tests of laser-induced contamination at 355 and 266 nm.

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Section: Icso 2020 International Conference On Space Opticsmentioning

confidence: 99%

“…Details on the manufacturing of laser-optics have been reported previously [9]. produce anti-reflective (AR) optical coatings at 355 nm.…”

Section: Manufacturing Of Optical Coatings and Particle Mitigation Schemesmentioning

confidence: 99%

See 1 more Smart Citation

Laser-induced damage and contamination testing for the next generation of LIDAR space optics

Bartels

Allenspacher

Alig

et al. 2021

International Conference on Space Optics — ICSO 2020

Self Cite

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“…However, high-energy damage to the human eyes or optical system also occurs at the same time [ 6 , 7 ]. For example, the laser radar used for intelligent assisted driving can cause luminous flux overloading in optical sensor devices, which consequently causes irreversible damage to the camera [ 8 ]. These types of laser damage seriously hinder production and human life, cause economic losses, or endanger physical health.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Broadband Reverse Saturable Absorption of Red/Black Phosphorus Heterojunction

Wang,

Liu,

et al. 2024

Molecules

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Although laser technology brings convenience to production and daily life, it also causes high-energy damage. Therefore, there is an urgent need to develop optical limiting materials for laser protection. In this study, a novel nonlinear optical material, red/black phosphorus lateral heterojunction, is successfully prepared through solvothermal and ultrasonic treatment. Using the Z−scan method, the nonlinear optical properties of the red/black phosphorus heterojunction are determined at wavelengths of 532 and 1064 nm. These results indicate that the red/black phosphorus heterojunction exhibits reverse saturable absorption properties in 1.2.3-glycerol. Interestingly, the red/black phosphorus heterojunction shows an enhanced performance over red phosphorus by introducing the black phosphorus phase. Moreover, the red/black phosphorus heterojunction is doped into organically modified silicate gel glass with excellent broadband optical limiting performance. This study highlights the promising prospect of the red/black phosphorus heterojunction in the nonlinear optical and optical limiting fields.

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“…在实际应用中，由于目标材质和反射特性不同，激光器输出激光照射到目标时，可能会有部分不可忽略的反射回光经过大气传输后，又被耦合到光纤激光器输出尾纤中，再次进入光纤激光器。尤其是在高功率光谱合成光纤激光系统 [8]- [11] ，由于输出激光功率非常高，针对反射回光的防护措施中很难有适合的在整个激光器系统的输出端设置的隔离器等光学器件。倘若有部分光经过目标材料表面的反射，使得反射回光返回并耦合至各级激光放大系统中，反射回光将在增益光纤中逐渐积累能量，这可能会对系统中光纤激光器造成损坏，存在很大的损伤隐患 [12]- [15] 。为了研究反向回光对激光器的影响，中电科二十七所张栋等人仿真分析了高功率光纤激光器中不同反射率表面可能产生的反向回光干扰光功率 [16] 。天津大学盛泉等人对反向回光放大进行了数值模拟，并讨论了损害激光器系统的因素 [17] 。 T. Chapman 等人讨论了高能激光照射在目标等离子体时反向回光对激光系统的损伤 [18] 。 Thimotheus Alig 等人研究了增加光学元件抗反射膜损伤阈值的方法 [19] 。在理论研究方面，激光大气传输湍流效应 [20], [21] 、空间光耦合 [22] 和高功率连续掺镱光纤激光器放大传输 [23]- [25]…”

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Theoretical model and numerical study of effect of target reflected light on high-power fiber laser

Duan¹,

Run-Qin²,

Yun-Bo³

et al. 2023

Acta Phys. Sin.

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In high power fiber laser systems, the reflected light generated when the laser hits the target may be recoupled to the laser and amplified by the laser, thus damaging the laser system. This situation is particularly serious for high power laser systems, such as spectral beam combining of high power fiber lasers, which lack effective light return protection. In order to solve the above problems, it is necessary to integrate various physical effects in the whole system link, evaluate and analyze the influence of reflected light on the operating state of the system, so as to optimize the optical path layout and system structure at the beginning of the design of fiber laser to avoid unnecessary losses. Based on the atmospheric transmission theory, fiber rate equation and medium heat conduction equation model, the effect of reflected light on high power fiber laser is analyzed. This paper is pointing to numerical simulation of coupling efficiency of reflected light of high power fiber lasers. It is found that under certain atmospheric conditions, the reflected power is related to the transmission distance, the offset Angle of the optical axis, divergence angle and the offset of the center position of the beam, and will affect the output power, beam quality factor, thermal effect and the signal to noise ratio of the stimulated Raman scattering spectrum of the fiber laser. The coupling efficiency of reflected light has a maximum value at a certain transmission distance, as an example, reflected light power up to 140W is obtained when transmission distance is 1500m, which will largely affect the laser system. Reflected power is affected by offset Angle of the optical axis far less than transmission distance when transmission increases from 500m to 2000m. As an example, variations of less than 0.1W is obtained when offset Angle increases from 0.11°to 0.44°. It is also shown that as the divergence angle changes from 0 arcsecond to 15 arcseconds, the coupling power decays nearly exponentially with the divergence angle change. The coupling efficiency is close to 1% near 12 arc seconds, which is almost negligible. The output beam quality of the laser system is also affected by the beam quality of reflected light. Deterioration of the beam quality of reflected light will lead to deterioration of the laser output beam quality. When reflected light power enters the fiber laser system increases, the forward output power will decrease and the backward signal power will increase, and the Raman power will increase rapidly near the fiber output end. When the reflected light is present, the thermal effects caused by selecting the gain fiber with different pump absorption coefficients are very important. The SRS rejection ratio decreases with the increase of pump absorption coefficient. As an example, The SRS rejection ratio decreases 5dB when pump absorption coefficient increases from 1.5 dB/m to 4.5 dB /m, resulting in a decrease in the signal-to-noise ratio of the laser, which will decrease the reliability of the fiber laser system. In the design and test of spectral beam combining systems for high power fiber lasers, the attention to reflected light should be paid through the entire process, which includes the outer optical path and the internal optical path of the laser. The comprehensive constraints of multiple key indicators are analyzed, and the probability of system damage or reliability degradation due to reflected light is evaluated. The research results of this paper have certain guiding significance for selecting suitable outer optical path layout and system parameters and optimizing the design of high energy fiber laser system.

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Prevention of laser damage precursors in spaceborne ultraviolet antireflection coatings

Cited by 6 publications

References 15 publications

Laser-induced damage and contamination testing for the next generation of LIDAR space optics

Laser-induced damage and contamination testing for the next generation of LIDAR space optics

Enhancement of Broadband Reverse Saturable Absorption of Red/Black Phosphorus Heterojunction

Theoretical model and numerical study of effect of target reflected light on high-power fiber laser

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