• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied optics >Imaging of trace species distributions by degenerate four-wave mixing: diffraction effects, spatial resolution, and image referencing
【24h】

Imaging of trace species distributions by degenerate four-wave mixing: diffraction effects, spatial resolution, and image referencing

机译：通过简并四波混频来成像痕量物种分布：衍射效应，空间分辨率和图像参考

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

We describe the theory of imaging by degenerate four-wave mixing (DFWM) using a standard diffraction theory of imaging by coherent light. We demonstrate that, even with the phase-conjugating geometry, no aberration correction can be achieved by DFWM imaging. We demonstrate the coherent nature of DFWM image formation using spatially modulated signals generated in flame OH in the phase-conjugating geometry. The intensity distribution in the Fourier plane of a telecentric lens system is shown to be the spatial Fourier transform of the object distribution characteristic of coherent imaging. The brightness of the DFWM signals exceeds that of similar laser-induced fluorescence signals that can be discriminated by restricting the aperture of the imaging system while still allowing a spatial resolution of approximately 70 μm. DFWM imaging with the forward-folded boxcars geometry is demonstrated and used in a simple referencing scheme to compensate for structure on the images imposed by nonuniformity of the laser beams employed. Images formed in NO are used to illustrate that structure on a scale of less than 100 μm arising from beam inhomogeneity can be removed by this referencing technique. 1997 Optical Society of America
机译：我们描述了通过使用相干光成像的标准衍射理论通过简并四波混频（DFWM）成像的理论。我们证明，即使具有相位共轭几何形状，DFWM成像也无法实现像差校正。我们使用相共轭几何中的火焰OH生成的空间调制信号证明DFWM图像形成的相干性。远心镜头系统的傅立叶平面中的强度分布显示为相干成像对象分布特征的空间傅立叶变换。 DFWM信号的亮度超过了类似的激光诱导的荧光信号的亮度，可以通过限制成像系统的孔径来区分它，同时仍允许约70μm的空间分辨率。演示了具有前向折叠棚车几何形状的DFWM成像，并在简单的参考方案中使用了DFWM成像，以补偿所采用的激光束不均匀所造成的图像结构。以NO形式形成的图像用于说明通过这种参考技术可以去除小于100μm的由光束不均匀性引起的结构。 1997年美国眼镜学会

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