We report on the laser damage resistance of ion beam-sputtered oxide materials (Al2O3, Nb2O5, HfO2, SiO2, Ta2O5, ZrO2) and mixtures Al2O3-SiO2, Nb2O5-SiO2, HfO2-SiO2, Ta2O5-SiO2, ZrO2-SiO2, irradiated by single 500 fs pulses at 1030 nm. Laser-induced threshold (LIDT), refractive index, bandgaps single-layer coatings are measured. For pure a linear evolution LIDT with bandgap is observed. The results in accordance our simulations based photo-ionization avalanche-ionization. In case mixtures,...

Achieving higher optical power in UV laser systems is a challenging task due to the limited performance of their built-in elements. As rule thumb, interference coatings such elements are found be weakest links by means laser-induced damage threshold (LIDT). The resistance directly attributed fundamental absorption properties deposited layers. Unfortunately, there only set available materials with discrete refractive indices that also compatible applications. In this study, an attempt made...

A principal possibility to overcome fundamental (intrinsic) limit of pure optical materials laser light resistance is investigated by designing artificial with desired properties. We explore the suitability high band-gap ultra-low refractive index material (n less than 1.38 at 550 nm) in context highly reflective coatings enhanced resistance. The new generation all-silica (porous/nonporous) SiO

ZrO2-SiO2 and Nb2O5-SiO2 mixture coatings as well those of pure zirconia (ZrO2), niobia (Nb2O5), silica (SiO2) deposited by ion-beam sputtering were investigated. Refractive-index dispersions, bandgaps, volumetric fractions materials in mixed analyzed from spectrophotometric data. Optical scattering, surface roughness, nanostructure, optical resistance also studied. Zirconia-silica mixtures experience the transition crystalline to amorphous phase increasing content SiO2. This results reduced...

Abstract The control of spatial propagation properties narrow light beams such as divergence, focusing or imaging are main objectives in optics and photonics. In this letter, we propose demonstrate experimentally a flat mirror, based on an especially designed dielectric structure without any optical axis. More generally, it also enables pattern reflection. mirror with transversal invariance can largely increase the applicability structured photonic materials for beam small-dimension circuits.

The laser damage resistance of an optical element in high power systems depends significantly on the surface quality substrate. In this experiment, commercially polished fused silica substrates were etched argon plasma generated by a RF source and their roughness, flatness properties investigated. This method can be applied vacuum chamber prior to deposition multilayer coatings without breaking vacuum. It was shown that etching 355 nm, radiation could improved more than 8 times. However, it...

Various investigations show that damage threshold of optical coatings by intense ultrashort laser pulses is closely related to the intensity electric field at layer interfaces. LIDT measurements high reflectance using femtosecond 800 nm wavelength are presented. ZrO₂, HfO₂ and Ta₂O₅ as refractive index materials for two sets experiments were chosen. Two different coating designs investigated: standard quarter-wavelength design with SiO₂...

Simple Nb(2)O(5), ZrO(2), SiO(2) oxide coatings and their mixtures with have been prepared by the Ion Beam Sputtering (IBS) technique. The Laser-Induced Damage of these samples has studied at 1064 nm, 12 ns. laser induced damage threshold (LIDT) decreases in both sets volumetric fraction high index material. We find that nanosecond LIDT is related to band gap material as it widely observed subpicosecond regime. probability curves fitted firstly a statistical approach, i.e. direct calculation...

The nonlinear lBO (liB 3 O 5 ) crystal is widely used in many Nd : YAG, Yb KGW and YlF lasers order to generate higher optical harmonics.However, the most limiting factor such applications resistance of their coated surfaces described by so-called laser Induced Damage Threshold (lIDT) parameter.In this work we investigate "fatigue" (multi-pulse) behaviour lIDTs crystals with different types (single AR@355 nm triple AR@355+532+1064 wavelength) anti-reflective coatings while optimising...

We propose and show by proof-of-principle calculations experiments that beam focusing imaging can be obtained in reflection from a flat interface of micromodulated dielectric structure. show, particular, one-dimensionally modulated chirped structure focus beam, performing an light pattern, i.e., act as transversely invariant mirror.

Despite the growing improvement in optical polishing and deposition technologies resistance of laser components used for high-power UV applications remains insufficient many cases. In this study influence different fused silica substrate preparation, post treatment processing techniques are examined terms surface roughness, scattering damage performance. The conventional polishing, etching, finally cleaning substrates have been investigated. Further, a part samples were also coated with...

In this work we report an experimental investigation of subsurface damage (SSD) in conventionally polished fused silica (FS) substrates which are widely used laser applications and directly influence performances optical elements. Two procedures were developed: 1 - acid etching 2 superpolishing. Additionally, surface roughness total integrated scattering (TIS) measurements performed to find correlation between the main properties induced threshold (LIDT) as circumstantial evidence...

We report laser-induced damage threshold (LIDT) measurements of periodically poled lithium niobate (PPLN) and magnesium-oxide-doped PPLN (MgO:PPLN) in the femtosecond pulse duration regime at 1030 nm with 100 kHz 75 MHz repetition rate. MgO:PPLN crystals broadband Nb₂O₅/SiO₂ AR coatings for 1.4 - 1.8 um spectral range were used. S-on-1 test LIDT performed. S was equal to 10⁶ 4.56*10¹⁰ pulses CPA laser system oscillator, respectively....

The stability of thin film coatings for applications especially in the UV spectral range is oftentimes a limiting factor further development radiation sources and beam delivery systems. Particularly, functional on laser conversions crystals as well resonator mirrors show an insufficient lifetime due to laser-induced degradation. Previous investigations power handling capability mostly concentrate properties pure oxide materials particle mitigation. Recent innovations ion sputtering...

We report on the laser damage resistance of thin films prepared by Ion Beam Sputtering. The samples are fused silica substrates coated with single layer pure oxides (SiO₂, Nb₂O₅, ZrO₂, HfO₂, Ta₂O₅, Al₂O₃, Sc₂O₃) and oxide mixtures various ratios (Nb₂O₅/SiO₂, ZrO₂/SiO₂, HfO₂/SiO<sub>2,...

Percolation of gold films ~15 nm thickness was controlled to achieve the largest openings during Au deposition. Gold evaporated on 300-nm-thick nanostructured porous and columnar SiO2, TiO2 MgF2 which were deposited by controlling angle, rotation speed film formation ambient pressure. The tested for SERS performance using thiophenol reporter molecules form a stable self-assembled monolayer gold. phase retardation these substrates up 5% wavelengths in visible spectral range, as measured...

In the past years usage of mixed oxides coatings lead to an important improvement laser damage threshold and quality optical elements. this study influence post treatment procedure - ex-situ annealing is examined in terms quality, constants induced (LIDT) HfO₂ SiO₂ coatings. Monolayer thin films containing different fractions are deposited with ion beam sputtering technology (IBS.) All samples annealed at temperatures optimal regimes defined. Refractive index absorption...

Commercially polished fused silica substrates were etched and their optical-physical properties investigated. Resistance to laser radiation was significantly enhanced no degradation of surface roughness, flatness or loss in transmission spectra observed.

The stresses in thin films are one of the main problems development small dimensions or optical components. In order to produce low-tension anisotropic coatings, characterization serial bideposition is essential. Structural and performance have been tested for TiO2 deposited by technique. Three-dimensional surface interferometric measurements were performed samples at various angles. Also experimental observations tensions annealed two-dimensional sculptured material presented. deposition...

High power laser systems are one of the most rapidly growing areas in development technology. This also leads towards higher requirements for environmental stability optical components and their resistance to laser radiation. There some reports showing that porous dielectric coatings more resistant intense radiation, however they have smaller than denser coatings, which sensitive radiation. The influence important technological parameters (deposition rate, substrate temperature, energy...