...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Two-Photon Excitation and Optical Spatial-Profile Reshaping via a Nonlinear Absorbing Medium
【24h】

Two-Photon Excitation and Optical Spatial-Profile Reshaping via a Nonlinear Absorbing Medium

机译：通过非线性吸收介质进行双光子激发和光学空间轮廓整形

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Two-photon processes have recently received considerable attention, as they offer opportunities for both fundamental research and technological applications. In this paper, we illustrate both of these opportunities by reporting on a study of two-photon properties and discussing one specific application of a new chromophore, tris[4-(7-benzothiazol-2-yl-9, 9-diethylfluoren-2-yl)phenyl]amine (AF-350). This new compound exhibits a large two-photon absorptive cross section and, more importantly from the application point of view, a high photochemical/photothermal stability. The nonlinear optical properties of an AF-350 solution were studied with ～800-nm laser pulses in both nanosecond and femtosecond regimes. The two-photon excited fluorescence spectrum and temporal behavior were compared with the corresponding results obtained for one-photon excitation. There is an ～11-ps delay between an ultrashort pump pulse and the first peak of the two-photon induced fluorescence signal, whereas no delay was measured between the pump pulse and the first peak of the one-photon induced fluorescence. The measured effective two-photon absorption (TPA) cross section is σ_2 = (151 ± 23) * 10~(-20) cm~4/GW for 7-ns, 810-nm laser pulses and σ_2 = (0.61 ± 0.02) * 10~(-20) cm~4/GW for 153-fs, 796-nm laser pulses. One specific application reported here is the spatial-profile reshaping and smoothing of a focused laser field.
机译：由于双光子过程为基础研究和技术应用提供了机会，因此最近受到了相当大的关注。在本文中，我们通过报告双光子性质并讨论一种新发色团tris [4-（7-benzothiazol-2-yl-9，9-diethylfluoren-2 -基）苯基]胺（AF-350）。这种新化合物具有较大的两光子吸收截面，从应用角度来看，更重要的是具有很高的光化学/光热稳定性。用纳秒级和飞秒级的〜800 nm激光脉冲研究了AF-350溶液的非线性光学性质。将双光子激发的荧光光谱和时间行为与单光子激发获得的相应结果进行了比较。在超短泵浦脉冲与双光子诱导的荧光信号的第一个峰值之间存在约11ps的延迟，而在泵浦脉冲与单光子诱导的荧光的第一个峰值之间没有检测到延迟。对于7 ns，810 nm激光脉冲，测得的有效双光子吸收（TPA）横截面为σ_2=（151±23）* 10〜（-20）cm〜4 / GW，σ_2=（0.61±0.02） * 10〜（-20）cm〜4 / GW，用于153 fs，796 nm激光脉冲。此处报告的一种特定应用是聚焦激光场的空间轮廓重塑和平滑。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号