Laser Induced Damage Threshold of Ta2O5 and Ta2O5/SiO2 Films at 532 and 1064 nm

Kumar, Sunil; Shankar, Ajay; Kishore, N.; Mukherjee, C.; Kamparath, Rajiv; Thakur, S.

doi:10.1016/j.ijleo.2018.09.026

Cited by 10 publications

(2 citation statements)

References 23 publications

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“…Therefore, a dichroic beamsplitter (as shown in Figure 1) coated on the infrared detector with both laser protection and MIR-AR functions is particularly important for protecting infrared photoelectric detection systems. Specifically, the dichroic beamsplitter must have three key characteristics: (1) a high LIDT in the laser band to protect the detector [8]; (2) high transmittance in the MIR region to improve the detection efficiency of the detector [9,10]; and (3) excellent environmental stability to ensure that the optical components can withstand the impacts of temperature, sand, acid, alkali, and other harsh environments. Amotchkina et al [11] developed near-infrared (770-1050 nm) and mid-infrared (4-8 µm) beamsplitters with high spectral efficiency using ZnS and YbF3 materials.…”

Section: Introductionmentioning

confidence: 99%

A Dichroic Beamsplitter for the Laser Protection of Infrared Detectors

et al. 2022

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The design and fabrication approach of a dichroic beamsplitter to meet the protection requirements of infrared detectors for blinding laser weapons is presented. The dichroic beamsplitter must protect against 1064 and 532 nm lasers and have high transmittance in the detection beam band of 3.6–4.7 µm. In order to realize the protection and antireflection (AR) functions of the dichroic beamsplitter, Ta2O5, which has a wide band gap and high thermodynamic stability, was selected as the high-refractive-index material. A multilayer stack was deposited on a silicon substrate by ion-assisted electron beam evaporation. The manufactured dichroic beamsplitter features a high laser-induced damage threshold (LIDT), excellent spectral characteristics in the requested spectral region, and good environmental stability.

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Section: Introductionmentioning

confidence: 99%

A Dichroic Beamsplitter for the Laser Protection of Infrared Detectors

et al. 2022

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“…Moreover, previous research has generally focused on the influence of the laser parameters on grating damage, such as wavelength [22], pulse width [15], spot [23] and pulse accumulation [24] effects; the differences in laser damage caused by different grating structure characteristics [25] such as the substrate material, the thickness of the film, the stacking of the films, and the manufacturing process; and the damage induced by impurities, defects [26], and contamination [27]. Most of the research methods have been based on experiments, with a lack of reports on the use of simulation models to predict the LIDT of metal gratings irradiated by nanosecond lasers.…”

Section: Introductionmentioning

confidence: 99%

Damage Characteristics of Aluminum-Coated Grating Irradiated by Nanosecond Pulsed Laser

Wang

Zhang

et al. 2022

Coatings

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An aluminum-coated grating (ACG) is a core component of laser systems and spectrometers. Understanding damage to the ACG induced by nanosecond lasers is critical for future high-power laser applications. In this study, we applied finite element simulation and practical experimentation to investigate the characteristics of ACG damage. Based on a coupling model using fluid heat transfer with the level-set method, we simulated the damage caused to an ACG by a 1064 nm nanosecond single pulse laser. The theoretical modeling showed that the ridge and bottom corners of the grid will be preferentially damaged, and the simulated damage threshold will range from 0.63 J/cm2 to 0.95 J/cm2. We performed a one-on-one damage test according to the ISO21254 standard to investigate the failure condition of 1800 l/mm ACGs; the laser-induced damage threshold (LIDT) was 0.63 J/cm2 (1064 nm, 6.5 ns). Microscopy images showed that the damaged area decreased with decreasing laser fluence, and scanning electron microscopy measurements showed that the main damage mechanism was thermodynamic damage, and that damage to the grid occurred first. The results of the experiments and simulations were in good agreement.

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