国产bbaaaaa片,成年美女黄网站色视频免费,成年黄大片,а天堂中文最新一区二区三区,成人精品视频一区二区三区尤物

首頁> 外文OA文獻 >Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting
【2h】

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

機譯：摻有乙炔和金納米粒子的溶膠凝膠玻璃可增強光功率限制

代理獲取
本網站僅為用戶提供外文OA文獻查詢和代理獲取服務，本網站沒有原文。下單后我們將采用程序或人工為您竭誠獲取高質量的原文，但由于OA文獻來源多樣且變更頻繁，仍可能出現獲取不到、文獻不完整或與標題不符等情況，如果獲取不到我們將提供退款服務。請知悉。
  • 摘要
  • 著錄項
  • 相似文獻
  • 相關主題

摘要

High power laser pulses can be a threat to sensors, including the human eye. Traditionally this threat has been alleviated by colour filters that blocks radiation in chosen wavelength ranges. Colour filters’ main drawback is that they block radiation regardless of it being useful or damaging, information is removed for wavelengths at which the filter protect. Protecting the entire wavelength range of a sensor would block or strongly attenuate the radiation needed for the operation of the sensor. Sol-gel glasses highly doped with Pt-Acetylide chromophores have previously shown high optical quality in combination with efficient optical power limiting through reverse saturable absorption1. These filters will transmit visible light unless the light fluence is above a certain threshold. A key design consideration of laser protection filters is linear absorption in relation to threshold level. By increasing chromophore concentration the threshold is lowered at the expense of higher linear absorption. This means that the user’s view is degraded through the filter. Adding small amounts of gold nanoparticles to the glasses resulted in an increase in optical power limiting performance. The optimal concentration of gold nanoparticles corresponded to a mean particle distance of several micrometers. The work in this licentiate thesis is about the characterization and explanation of this effect. The glasses investigated in this work were MTEOS Sol-Gel glasses doped with either only gold nanoparticles of varying shape and concentration, 50mM of PE2-CH2OH codoped with gold nanoparticles or 50mM of PE3-CH2OH codoped with gold nanoparticles. The glasses only doped with gold nanoparticles showed high optical power limiting performance at 532nm laser wavelength, but no optical power limiting at the fluences tested at 600nm. The PE2-CH2OH glasses codoped with gold nanoparticles showed an enhancement of optical power limiting at 600nm for the low gold nanoparticle concentration glasses. The enhancement was weakened or not present for higher concentrations. A similar enhancement above noise level for the PE3-CH2OH glasses was not found. A population model is used to give a qualitative explanation of the findings. The improvement in optical power limiting performance for the PE2-CH2OH glasses is explained by the gold nanoparticles helping to more quickly populate the highly absorbing triplet state during the rising edge of the laser pulse by enhancing two-photon absorption. The lack of any marked enhancement for the PE3-CH2OH glasses is explained by the PE3-CH2OH chromophore already being of sufficiently high performance to quickly populate the highly absorbing triplet state during the rising edge of the laser pulse. Further work is necessary to validate this model against other chromophores and improving its quantitative predictive power.
機譯：高功率激光脈沖可能會威脅包括人眼在內的傳感器。傳統(tǒng)上，這種威脅已通過濾色鏡來緩解，該濾色鏡可阻止選定波長范圍內的輻射。彩色濾光片的主要缺點是，無論有用還是有害，它們都會阻擋輻射，因此會濾除濾色片保護波長的信息。保護傳感器的整個波長范圍將阻止或強烈衰減傳感器工作所需的輻射。以前，摻有Pt-乙內酯發(fā)色團的溶膠-凝膠玻璃具有很高的光學質量，并且通過反向飽和吸收有效地限制了光功率1。除非光通量高于某個閾值，否則這些濾光器將透射可見光。激光保護濾光片的關鍵設計考慮因素是相對于閾值水平的線性吸收。通過增加生色團濃度，可以降低閾值，但要以較高的線性吸收為代價。這意味著通過過濾器會降低用戶的視圖。向玻璃中添加少量金納米顆粒會導致光功率限制性能的提高。金納米顆粒的最佳濃度對應于幾微米的平均顆粒距離。本被許可論文中的工作是關于這種效應的表征和解釋。在這項工作中研究的玻璃是僅摻雜形狀和濃度不同的金納米顆粒，摻有金納米顆粒的50mM PE2-CH2OH或摻有金納米顆粒的50mM PE3-CH2OH的MTEOS溶膠-凝膠玻璃。僅摻雜金納米顆粒的玻璃在532nm激光波長下顯示出高光功率限制性能，但在600nm處測試的注量下沒有光功率限制。與金納米顆粒共摻雜的PE2-CH2OH玻璃對于低金納米顆粒濃度的玻璃在600nm處顯示出光功率限制的增強。對于更高的濃度，增強作用減弱或不存在。未發(fā)現PE3-CH2OH玻璃在噪音水平上有類似的增強。人口模型用于對發(fā)現進行定性解釋。 PE2-CH2OH玻璃的光功率限制性能得到改善，這是因為金納米顆粒通過增強雙光子吸收有助于在激光脈沖上升沿期間更快地填充高吸收三重態(tài)。 PE3-CH2OH玻璃缺乏任何明顯的增強，是因為PE3-CH2OH生色團已經具有足夠的性能，可以在激光脈沖的上升沿快速填充高吸收三重態(tài)。需要進一步的工作來驗證該模型與其他生色團的關系，并提高其定量預測能力。

著錄項

  • 作者

    Lundén, Hampus;

  • 作者單位
  • 年度 2017
  • 總頁數
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類

相似文獻

  • 外文文獻
  • 中文文獻
  • 專利
代理獲取

客服郵箱：kefu@zhangqiaokeyan.com

京公網安備：11010802029741號 ICP備案號：京ICP備15016152號-6 六維聯合信息科技 (北京) 有限公司?版權所有

  • 客服微信

  • 服務號