Optical resistance and spectral properties of anti-reflective coatings deposited on LBO crystals by ion beam sputtering

Abromavičius, Giedrius; Buzelis, Rytis; Drazdys, Ramutis; Juškevičius, Kęstutis; Kičas, Simonas; Tolenis, Tomas; Mirauskas, Julius; Ščiuka, Mindaugas; Sirutkaitis, Valdas; Melninkaitis, Andrius

doi:10.3952/lithjphys.51407

Cited by 17 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High-index HfO 2 film exhibits 2.01 at 355 nm and 1.93 at 1064 nm wavelengths, whereas SiO 2 marked 1.47 at 355 nm and 1.45 at 1064 nm wavelengths as the refractive indices. These results are consistent with the refractive indices, with a little deviation (due to different deposition methods and process parameters) reported by other authors [50,79,80]. The knowledge obtained from the single-layer thin films was then applied to deposition of heterostructures.…”

Section: Resultssupporting

confidence: 90%

Heterostructure Films of SiO2 and HfO2 for High-Power Laser Optics Prepared by Plasma-Enhanced Atomic Layer Deposition

et al. 2023

View full text Add to dashboard Cite

Absorption losses and laser-induced damage threshold (LIDT) are considered to be the major constraints for development of optical coatings for high-power laser optics. Such coatings require paramount properties, such as low losses due to optical absorption, high mechanical stability, and enhanced damage resistance, to withstand high-intensity laser pulses. In this work, heterostructures were developed by sub-nanometer thin films of SiO2 and HfO2 using the plasma-enhanced atomic layer deposition (PEALD) technique. Thin-film characterization techniques, such as spectroscopic ellipsometry, spectrophotometry, substrate curvature measurements, X-ray reflectivity, and Fourier transform infrared spectroscopy, were employed for extracting optical constants, residual stress, layer formation, and functional groups present in the heterostructures, respectively. These heterostructures demonstrate tunable refractive index, bandgap, and improved optical losses and LIDT properties. The films were incorporated into antireflection coatings (multilayer stacks and graded-index coatings) and the LIDT was determined at 355 nm wavelength by the R-on-1 method. Optical absorptions at the reported wavelengths were characterized using photothermal common-path interferometry and laser-induced deflection techniques.

show abstract

Section: Resultssupporting

confidence: 90%

Heterostructure Films of SiO2 and HfO2 for High-Power Laser Optics Prepared by Plasma-Enhanced Atomic Layer Deposition

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The LIDT value of the double-layer AR coating is 2.24 J•cm − 2 , slightly lower than that of the bottom layer of 2.58 J•cm − 2 and the top layer of 2.32 J•cm − 2 , which may be due to the different thermal energy absorption of different lms [22]. It should be noted that the LIDT of the double-layer coating matches the reported values of 1.5-10 J•cm − 2 (355 nm, 6-10 ns) for oxide optical materials [23][24][25], and the proposed coating can meet the basic application requirements of ultraviolet lasers.…”

Section: Of Lidt Of the Coatingssupporting

confidence: 67%

Preparation of contamination-resistant ultraviolet broadband double-layer antireflective coating

Wang,

Jin,

Xiao

et al. 2024

Preprint

View full text Add to dashboard Cite

A double-layer broadband antireflection (AR) coating with excellent transmittance at 250–400 nm has been designed and prepared by the sol-gel method. The quarter-half double-layer structure is optimized with the aid of Filmstar thin film design software. Mesoporous SiO2 film templated by an ethylene oxide-propylene oxide-ethylene oxide triblock copolymer is used as the top layer, and a ZrO2-SiO2 hybrid film with matching refractive index is employed as the bottom layer. 1H, 1H, 2H, 2H-Perfluorodecyltriethoxysilane is used to modify the surface of the AR coating, which greatly improves the environmental stability of the coating. The obtained double-layer AR coating can achieve an average transmittance of 99.34% in the wavelength range of 250–400 nm. The laser induced damage threshold of the coating is measured using a 355 nm laser (pulse width: 6.4 ns), and the results show that the damage threshold is 2.24 J·cm− 2. This study provides a new way for the preparation of UV AR coatings with good optical performance and environmental stability.

show abstract

“…First, in the experimental case, the width (at the entrance) of the crater increased, whereas, it remains constant in the numerical case. It is well known that in the case of multiple pulse impingement the ablation threshold drops, since permanent defects are created in the peripheral region [43]. However, for the purpose of this study, the increase in width is not as impactful since it does not drastically change the shape, and ultimately a V-shape groove still manifests.…”

Section: Numerical Simulations Of Crater Formation When Multiple Succmentioning

confidence: 83%

Femtosecond Beam Transformation Effects in Water, Enabling Increased Throughput Micromachining in Transparent Materials

et al. 2019

View full text Add to dashboard Cite

Femtosecond lasers are widely applied in scientific and industrial fields. Recent trends in the laser market show decreasing prices for femtosecond units, which will ultimately lead to the opening of new markets that were inaccessible in the past due to the high costs of such systems. To this end, new techniques that enable micromachining of materials with increased efficiency are interesting. In this article, we demonstrate a technique that may be used for cutting and drilling various materials. By placing a layer of water on top of the samples and loosely focusing laser light on the surface, it was found that the micromachining throughput is increased by up to 10-fold as compared with micromachining without the water layer (conventional focusing in air), however, the main reasons for the increase in fabrication efficiency have not been fully understood until now. By modelling the propagation of the femtosecond pulses by means of the nonlinear modified Schrodinger equation through the water layer, we show that the increased throughput is attributed to the changing of the Gaussian intensity profile. In addition, we confirm these findings by numerically modelling the ablated crater formation.

show abstract

Optical resistance and spectral properties of anti-reflective coatings deposited on LBO crystals by ion beam sputtering

Cited by 17 publications

References 10 publications

Heterostructure Films of SiO2 and HfO2 for High-Power Laser Optics Prepared by Plasma-Enhanced Atomic Layer Deposition

Heterostructure Films of SiO2 and HfO2 for High-Power Laser Optics Prepared by Plasma-Enhanced Atomic Layer Deposition

Preparation of contamination-resistant ultraviolet broadband double-layer antireflective coating

Femtosecond Beam Transformation Effects in Water, Enabling Increased Throughput Micromachining in Transparent Materials

Contact Info

Product

Resources

About