Mr. Erikas Atkočaitis Profile

Erikas Atkočaitis

at Vilnius Univ

SPIE Involvement:

Author | Student Chapter Vice President

Publications (9)

Proceedings Article | 18 December 2024 Presentation

Exploring non-linear absorptance in Ta2O5, HfO2, and SiO2 oxcide coatings: a comparative analysis

Vladimir Pervak, Erikas Atkočaitis, Andrius Melninkaitis

Proceedings Volume PC13190, PC1319001 (2024) https://doi.org/10.1117/12.3033600

KEYWORDS: Silica, Light absorption, Laser interferometry, Picosecond phenomena, Oxides, Optical coatings, Multilayers, Mirrors, Laser irradiation, Beam path

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Proceedings Article | 18 December 2024 Presentation

Investigating the lifetime of dielectric coatings: the role of absorption

Erikas Atkočaitis, Austėja Aleksiejūtė, Justinas Galinis, Andrius Melninkaitis

Proceedings Volume PC13190, PC131900B (2024) https://doi.org/10.1117/12.3032538

KEYWORDS: Absorption, Optical coatings, Dielectrics, Laser damage threshold, Laser sources, Ultraviolet radiation, UV optics, Optical components, Nonlinear optics, Laser systems engineering

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Proceedings Article | 24 November 2023 Presentation

Exploring nonlinear effects of laser irradiation on single- and multi-layer dielectric coatings: a study on HfO2, ZrO2, and Al2O3 coatings

Erikas Atkocaitis, Martynas Keršys, Simonas Kicas, Vaida Grasyte, Justinas Galinis, Austeja Aleksiejute, Andrius Melninkaitis

Proceedings Volume PC12726, PC127260D (2023) https://doi.org/10.1117/12.2685117

KEYWORDS: Absorption, Laser irradiation, Zirconium dioxide, Optical coatings, Dielectrics, Laser damage threshold, Picosecond phenomena, Material fatigue, Pulsed laser operation, Light absorption

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Proceedings Article | 5 October 2023 Presentation + Paper

Solid-state femtosecond UV lasers: recent advances and challenges

Lukas Rimkus, Julius Darginavičius, Erikas Atkočaitis, Aurimas Augus

Proceedings Volume 12652, 1265206 (2023) https://doi.org/10.1117/12.2676317

KEYWORDS: Ultraviolet radiation, Harmonic generation, Femtosecond phenomena, X-rays, Industrial applications, Deep ultraviolet, Laser applications, Nonlinear crystals, Laser processing, Contamination

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Proceedings Article | 3 December 2022 Presentation

Experimental and numerical study of LIDT pulse temporal scaling for anti-reflective coated LBO crystals

Erikas Atkocaitis, Linas Smalakys, Andrius Melninkaitis

Proceedings Volume PC12300, PC123000I (2022) https://doi.org/10.1117/12.2641220

KEYWORDS: Crystals, Crystallography, Failure analysis, Antireflective coatings, Ultraviolet radiation, Plasma, Physics, Numerical analysis, Lithium, Laser induced damage

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Proceedings Article | 2 December 2022 Poster + Presentation + Paper

Real-time investigation of the UV nonlinear absorptance in an anti-reflective coated LBO crystals

Erikas Atkočaitis, Andrius Melninkaitis

Proceedings Volume 12300, 123000J (2022) https://doi.org/10.1117/12.2641222

KEYWORDS: Absorption, Data modeling, Coating, Crystals, Nonlinear crystals, Nonlinear optics, Ultraviolet radiation, Laser induced damage

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Proceedings Article | 12 October 2021 Presentation

Experimental study of LIDT scaling laws for metallic coatings: effect of pulse duration within fifteen orders of magnitude

Marco Jupé, Erikas Atkocaitis, Emilija Zutautaite, Kevin Kiedrowski, Morten Steinecke, Lars Herrero, Lars Jensen, Urte Kimbaraite, Mindaugas Šciuka, Andrius Melninkaitis

Proceedings Volume 11910, 119100G (2021) https://doi.org/10.1117/12.2599113

KEYWORDS: Metallic coatings, Metals, Thermal modeling, Zinc, Ultrafast phenomena, Tungsten, Titanium, Tantalum, Silver, Silicon

Proceedings Article | 12 October 2021 Poster + Presentation

Antireflection coatings on LBO crystals: investigation of LIDT scaling with pulse duration at IR and UV wavelengths.

Erikas Atkocaitis, Linas Smalakys, Andrius Melninkaitis

Proceedings Volume 11910, 119101M (2021) https://doi.org/10.1117/12.2599074

KEYWORDS: Antireflective coatings, Crystals, Ultraviolet radiation, Picosecond phenomena, Nonlinear crystals, Infrared imaging, Pulsed laser operation, Nonlinear optics, Micromachining, Laser systems engineering

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Proceedings Article | 12 October 2021 Presentation

Analysis of lifetime distributions of dielectric and metallic mirrors

Evelina Drobuzaite, Linas Smalakys, Erikas Atkocaitis, Andrius Melninkaitis

Proceedings Volume 11910, 119100L (2021) https://doi.org/10.1117/12.2598925

KEYWORDS: Dielectrics, Mirrors, Laser induced damage, Dielectric mirrors, Standards development, Optical components, Bayesian inference, Ultraviolet radiation, Space operations, Reflectivity

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When discussing laser-induced damage phenomena, the main parameter of interest is the laser-induced damage threshold (LIDT). Since LIDT is a function of irradiation time (or number of pulses), its characterization is of critical importance when designing reliable industrial or medical laser systems or even planning long-term space missions involving high power lasers. Within laser-induced damage community, decrease of LIDT with increase in irradiation time (the so-called fatigue effect) is often estimated by using the S-on-1 test procedure described in the ISO 21254-2 standard. However, due to measurement limitations, S-on-1 tests are usually carried out for relatively small numbers of pulses, therefore additional extrapolation methods must be used in order to predict lifetime of optical components. The simple extrapolation procedure provided by the ISO 21254-2 standard no longer meets the demands of the community as it ignores existence of multiple failure modes and data censoring resulting from different damage detection techniques, therefore a new approach for LIDT extrapolation is much needed. In our previous work [1], we explored application of accelerated lifetime testing (ALT) techniques on S-on-1 test data. ALT approach treats S-on-1 experiments as sets of lifetime (or time to failure) distributions at different fluence levels instead of damage probability curves at different numbers of pulses. We have shown that this approach, combined with Bayesian inference and Markov chain Monte Carlo (MCMC) sampling, is well suited for extrapolation and uncertainty evaluation of S-on-1 experiments. However, proper application of these methods require empirical knowledge about lifetime distributions for different material types and irradiation parameters. Therefore, in this work an attempt is made to experimentally characterize lifetime distributions of highly reflective dielectric and metallic laser optics at both nanosecond and femtosecond pulse durations. UV and IR wavelengths as well as influence of irradiation fluence and polarization state are also considered. The results of this study provided insights into lifetime distributions of laser-induced damage and helped to shape guidelines for extrapolating S-on-1 experiments to longer irradiations. [1] L. Smalakys, A. Melninkaitis, Predicting lifetime of optical components with Bayesian inference, Opt. Express 29, 903-915 (2021).

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