Optical Materials: X最新文献

{"title":"ZnSe:(Cr,Fe) laser crystal matrices: Challenges related to doping","authors":"K.V. Lamonova ,&nbsp;S. Orel ,&nbsp;A. Prokhorov ,&nbsp;N. Kovalenko ,&nbsp;M. Schmidbauer ,&nbsp;A. Kwasniewski ,&nbsp;Yu Kazarinov ,&nbsp;J.W. Tomm","doi":"10.1016/j.omx.2024.100321","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100321","url":null,"abstract":"<div><p>We investigate co-doped ZnSe: (Cr, Fe) laser crystals with an approach that includes both optical spectroscopy and theoretical modelling. We found that concentrations of chromium and iron up to 10¹⁸ cm⁻³ are optimal for obtaining a homogeneous solid solution in designing laser crystals. Higher dopant concentrations lead to the formation of clusters with spinel structure in the ZnSe matrix. The optimal effectiveness of ZnSe laser media with active Cr²⁺ and Fe²⁺ elements is achieved at temperatures of around 100 K. Heating induces charge transfers like Fe²⁺→Fe³⁺ and Cr²⁺→Cr³⁺, while cooling results in phonon freezing. A theoretical model has been developed to explain the observed temperature evolution of the absorption spectrum. The types and values of distortions of the Cr- and Fe-based coordination complexes are determined. We have found that the Jahn-Teller distortions are crucial for modelling the temperature-dependent changes of the absorption spectra.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"22 ","pages":"Article 100321"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000330/pdfft?md5=1374461fd29180d612c161e1066f2616&pid=1-s2.0-S2590147824000330-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140900943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical and scintillation properties of Pr3+-doped (La, Y)2Si2O7 single crystals","authors":"Yuka Abe ,&nbsp;Takahiko Horiai ,&nbsp;Jan Pejchal ,&nbsp;Yuui Yokota ,&nbsp;Masao Yoshino ,&nbsp;Rikito Murakami ,&nbsp;Takashi Hanada ,&nbsp;Akihiro Yamaji ,&nbsp;Hiroki Sato ,&nbsp;Yuji Ohashi ,&nbsp;Shunsuke Kurosawa ,&nbsp;Kei Kamada ,&nbsp;Akira Yoshikawa ,&nbsp;Martin Nikl","doi":"10.1016/j.omx.2024.100318","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100318","url":null,"abstract":"<div><p>Pr-doped scintillators are attracting attention because of their potential applications in medical devices. In this study, we focused on Pr-doped (La, Y)₂Si₂O₇ scintillators to grow single crystals by the micro-pulling-down method and to evaluate their optical and scintillation properties. From the powder XRD results, the crystal structure and the space group were identified to be monoclinic and <em>P</em>2₁/<em>n</em>, respectively. The results of optical and scintillation characterization show that the luminescence from the Pr³⁺ 5d₁–4f transition increases with increasing Pr³⁺ concentration. The maximum light yield was also obtained for the sample with the highest Pr³⁺ concentration. The Pr-doped (La, Y)₂Si₂O₇ single crystal shows promising properties for application in radiation detection.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"22 ","pages":"Article 100318"},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000305/pdfft?md5=9152e46f85e6d1045a1959fcf24b8c80&pid=1-s2.0-S2590147824000305-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140650649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Barium chalcogenides for nonlinear optics in the mid-IR: Properties and applications","authors":"Valentin Petrov ,&nbsp;Kiyoshi Kato ,&nbsp;Kentaro Miyata","doi":"10.1016/j.omx.2024.100319","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100319","url":null,"abstract":"<div><p>The essential properties of BaGa₄S₇ (BGS), BaGa₄Se₇ (BGSe), BaGa₂GeS₆ (BGGS), BaGa₂GeSе₆ (BGGSe), and Ba₂Ga₈GeS₁₆ (B2GGS) are reviewed, together with all nonlinear optical applications of these non-centrosymmetric crystals realized so far.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"22 ","pages":"Article 100319"},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000317/pdfft?md5=9796fa9ebee8c3a9b70fcbe6b6819ffd&pid=1-s2.0-S2590147824000317-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140639386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of Dy3+ on the optical and radiation attenuation properties of TeO2–ZnO–Na2O–Sm2O3 glasses","authors":"Canel Eke","doi":"10.1016/j.omx.2024.100317","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100317","url":null,"abstract":"<div><p>This paper aims to investigate theoretically addition of the Dy³⁺ content on the optical and radiation attenuation properties of TeO₂–ZnO – Na₂O–Sm₂O₃ glasses. The STZNDy1 possesses the greatest molar refractivity (R_m) and molar polarizability (α_m) whereas the STZNDy5 possesses the lowest R_m and α_m. When Dy₂O₃ content adds into the glass, the reflection loss sharply increases then it declines up to 1.5 mol.% of Dy₂O₃ content afterwards it is stable however the optical transmission sharply decreases then it increases up to 1.5 mol % of Dy₂O₃ content afterwards it is stable. The STZNDy5 and STZNDy6 own the greatest metallization criterion while they own the lowest static dielectric constant and optical dielectric constant. Both linear attenuation coefficient and mass attenuation coefficient of the STZNDy glasses increase with the addition of the Dy₂O₃ content. The STZNDy1 has the highest half value layers (HVLs) and tenth value layers (TVLs) whereas the STZNDy6 has the smallest HVLs and TVLs. The radiation protection efficiency enhances whereas mean free path declines as Dy₂O₃ content increases in the glasses. Consequently, the STZNDy6 owns the good radiation attenuation ability in the STZNDy glasses, and adding Dy₂O₃ increases the radiation attenuation characteristics of the STZNDy glasses.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"22 ","pages":"Article 100317"},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000299/pdfft?md5=918438026f1f3864ed50c041054949f0&pid=1-s2.0-S2590147824000299-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140604581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multilayered Ru/TiO2 hyperbolic material for nonlinear optics","authors":"F.A. Araiza-Sixtos ,&nbsp;F. Solorio-Soto ,&nbsp;E.G. Lizarraga-Medina ,&nbsp;H. Tiznado ,&nbsp;R. Carriles-Jaimes ,&nbsp;J.L. Bueno-Escobedo ,&nbsp;R. Rangel-Rojo","doi":"10.1016/j.omx.2024.100314","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100314","url":null,"abstract":"<div><p>In this work we present the design, fabrication and study of the optical properties of hyperbolic materials based on multilayered metal–dielectric Ru/TiO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> structures. The samples were fabricated using the Atomic Layer Deposition technique, and their structure was designed to have an Epsilon Near Zero point near 800 nm to match the laser wavelength employed to study their response. The linear optical properties were studied using spectrophotometry and spectral ellipsometry. The nonlinear response was studied as a function of incident irradiance using the z-scan technique with fs pulses as a function of wavelength throughout the visible, allowing the determination of the refractive and absorptive contributions to the nonlinear response. Given that a high pulse repetition rate was employed, cumulative pulse to pulse thermal effects can be present, because of this, a modification of the z-scan technique allowed the resolution of the electronic and thermal contributions to the response.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"22 ","pages":"Article 100314"},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000263/pdfft?md5=ddd1608f8fffce5bdd49aa18ca227f89&pid=1-s2.0-S2590147824000263-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140546286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Current understanding of anomalous deep red / NIR emission bands in highly Mn4+, Mn2+, and Cr3+-doped phosphors: Exchange-coupled pair or trap-related luminescence?","authors":"Sadao Adachi","doi":"10.1016/j.omx.2024.100312","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100312","url":null,"abstract":"<div><p>Transition metal-activated phosphors belong to an important family of luminescent materials used as the next generation light sources for display, illumination systems, and other uses because of their small size, high luminescence efficacy, and long operation lifetime. Broad-band deep red or near infrared (NIR) emission has recently been observed in a wide variety of concentrated Mn⁴⁺, Mn²⁺, and Cr³⁺ phosphors as an additional anomalous emission band of the normal red or green emission band in such transition metal-activated phosphors. At present, the following two possibilities have been proposed as the cause of this anomalous broad emission band: (<em>i</em>) exchange-coupled transition-metal ion pair recombination and (<em>ii</em>) deep red or NIR-emitting traps activated by an efficient energy migration over the transition-metal sublattice to such trap centers. The present article presents current understanding of the anomalous deep red and NIR emission bands in highly Mn⁴⁺, Mn²⁺, and Cr³⁺-activated phosphors based on our current knowledge of the transition metal-activated phosphor physics.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"22 ","pages":"Article 100312"},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S259014782400024X/pdfft?md5=ec84728be73db1912721a95fa5f37440&pid=1-s2.0-S259014782400024X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140535465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temperature dependence of Charge Transfer Luminescence in Yb3+:YAG single crystal","authors":"Yaraslau Padrez ,&nbsp;Vitalii Boiko ,&nbsp;Juraj Kajan ,&nbsp;Tomáš Gregor ,&nbsp;Vira Tinkova ,&nbsp;Renata Karpicz ,&nbsp;Mykhailo Chaika","doi":"10.1016/j.omx.2024.100315","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100315","url":null,"abstract":"<div><p>Charge Transfer Luminescence (CTL) processes play a major roles in Yb:YAG laser materials act as a source of energy losses decrease the performance of this material. In this work, the temperature dependence of CTL in Yb:YAG single crystal was investigated. A 375-nm picosecond laser source was used as the excitation source. It was shown that the change in temperature affects the emission intensity and the position maximum of CTL occurring between perturbated F⁺ centers and Yb³⁺ ions. The increase in the temperature caused the blueshift of CTL, while the emission intensity have the inverted U-shape. The measured luminescence lifetime of CLT was in the range of 8 ns – 13 ns and barely changes with temperature. The temperature dependence of the CTL parameters was explained by the change in the energy transfer processes between F⁺ centers and the charge transfer state of Yb:YAG single crystals.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"22 ","pages":"Article 100315"},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000275/pdfft?md5=c6ea6a674868585815bd3cfd4f9118d3&pid=1-s2.0-S2590147824000275-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140535464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transmission and nanohardness studies of ternary GaAs1-xPx layers grown from the vapor phase by heteroepitaxy","authors":"Valentin Petrov ,&nbsp;Li Wang ,&nbsp;Ginka Exner ,&nbsp;Shivashankar R. Vangala ,&nbsp;Aleksandar Grigorov ,&nbsp;Elizabeth Ivanova ,&nbsp;Peter G. Schunemann ,&nbsp;Vladimir L. Tassev","doi":"10.1016/j.omx.2024.100313","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100313","url":null,"abstract":"<div><p>Transmission measurements in the 0.5–25-μm spectral range are performed on thin (&lt;350-μm) GaAsP layers grown by Hydride Vapor Phase Epitaxy (HVPE) on plain (100) GaAs substrates. Comparison with calculations taking into account multiple reflections reveals the role of the surface polishing quality on the clear transmission window and the wavelength dependent losses. A measurement of a 5-mm thick epitaxially grown GaP underlines more realistic spectral limitations on the application of orientation-patterned structures based on GaP and GaAsP for nonlinear optical frequency conversion. The mid-IR cut-off wavelength for the ternary GaAsP layers is almost independent of the composition and corresponds to the same two-phonon absorption limit observed in the binary GaP. Nanohardness and Young's modulus are measured for the same samples to evaluate their compositional dependence. The nanohardness dependence on the P-content obeys a second order polynomial law with a maximum around P = 0.8. Young's modulus depends linearly on the P-content, similar to the trend observed in other ternary systems, such as In_xGa_1−xAs and In_xGa_1-xP. The evolution of the band-gap, estimated from the transmission measurements, with the composition of the ternary compounds is linear in the range of 0–0.5 for the P content. In this same range the nanohardness can be considered to be linearly proportional to the band-gap.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"22 ","pages":"Article 100313"},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000251/pdfft?md5=43062240c91a76c8cd7895a8380dfbbe&pid=1-s2.0-S2590147824000251-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140330758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Red-emitting olivine-type ceramic luminophores Li2MGeO4 (M = Zn, Mg) doped with Sm3+","authors":"Nikola Bednarska-Adam ,&nbsp;Marta Kuwik ,&nbsp;Tomasz Goryczka ,&nbsp;Wojciech A. Pisarski ,&nbsp;Joanna Pisarska","doi":"10.1016/j.omx.2024.100311","DOIUrl":"10.1016/j.omx.2024.100311","url":null,"abstract":"<div><p>This article investigates the luminescent properties of olivine-type germanate ceramics luminophores doped with trivalent samarium (Sm³⁺) ions, prepared through a solid-state reaction method with two distinct compositions: Li₂MgGeO₄:0.5Sm³⁺ and Li₂ZnGeO₄:0.5Sm³⁺. The emission spectra for germanate systems displayed characteristic bands associated with Sm³⁺ ion transitions. The results obtained for the studied ceramic luminophores indicated that orangish-red and red emissions attributed to characteristic 4f-4f transitions of Sm³⁺ ions. On the other hand, broad bands assigned directly to the ceramic matrices were registered around 425 nm and 440 nm for Li₂MgGeO₄:0.5Sm³⁺ and Li₂ZnGeO₄:0.5Sm³⁺ samples, respectively. The impact of the matrix composition on the emission spectra of samarium-doped olivine-type germanate ceramics has been examined in details.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"22 ","pages":"Article 100311"},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000238/pdfft?md5=8b8563d417975dafe93e1c0c33273d04&pid=1-s2.0-S2590147824000238-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140406783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth of ultimate high-density scintillating films for high-resolution X-ray imaging at synchrotrons","authors":"Laura Wollesen ,&nbsp;Paul-Antoine Douissard ,&nbsp;Philip Cook ,&nbsp;Pavel Loiko ,&nbsp;Gurvan Brasse ,&nbsp;Jérémie Margueritat ,&nbsp;Patrice Camy ,&nbsp;Thierry Martin ,&nbsp;Christophe Dujardin","doi":"10.1016/j.omx.2024.100309","DOIUrl":"https://doi.org/10.1016/j.omx.2024.100309","url":null,"abstract":"<div><p>Scintillators are X-ray to visible light converters applied in X-ray imaging detectors used at synchrotrons. Drastically improved performances of the 4<span><math><msup><mrow></mrow><mrow><mi>t</mi><mi>h</mi></mrow></msup></math></span> generation synchrotron sources enable us to perform X-ray imaging experiments at higher energies. For high spatial resolution X-ray imaging (micrometer to submicrometer), thin scintillating films are required. Consequently, especially for high X-ray energies (30<!--> <!-->keV to 100<!--> <!-->keV), the detection efficiency is limited due to the low X-ray absorption efficiency of the thin films. We have used Liquid Phase Epitaxy (LPE) to grow thin films of one of the ultimate high-density materials, Lu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Hf<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>7</mn></mrow></msub></math></span>:Eu<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, which demonstrate scintillating properties and thus combine high spatial resolution and maximized absorption efficiency. X-ray imaging experiments demonstrate that the Modulation Transfer Function (MTF) reaches 10% at 900 lp/mm, and radiographs visually confirm the promising imaging properties. We present structural, luminescent, and scintillation characterization of Lu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Hf<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>7</mn></mrow></msub></math></span>:Eu thin films grown on ZrO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>:Y substrates, showing that the films crystallize in the disordered fluorite structure and the europium ions incorporate into the structure and enhance the luminescence intensity. This contribution is a first step toward developing promising ultra-dense, hafnate-based scintillating screens for high spatial resolution X-ray imaging.</p></div>","PeriodicalId":52192,"journal":{"name":"Optical Materials: X","volume":"22 ","pages":"Article 100309"},"PeriodicalIF":0.0,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590147824000214/pdfft?md5=2c8d51776fdaff8d956a8be2dd605d9e&pid=1-s2.0-S2590147824000214-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}