Enhanced depth resolution in terahertz imaging using phase-shift interferometry
Enhanced depth resolution in terahertz imaging using phase-shift interferometry
复制标题
DOI：
10.1063/1.1346626
复制
发表时间：
2001-02
影响因子：
4
通讯作者：
Jon Johnson;T. Dorney;D. Mittleman
中科院分区：
文献类型：
--
作者：
Jon Johnson;T. Dorney;D. Mittleman
本文描述了一种少周期光脉冲成像技术。被成像的物体被放置在迈克尔逊干涉仪一只臂上透镜的焦点处。这引入了一个相移约π的两个臂之间的干涉仪，通过盖伊相移。由此产生的破坏性干涉提供了一个几乎无背景的测量，并大大提高了深度分辨率。我们使用太赫兹辐射的单周期脉冲证明了这一点，并表明有可能分辨出比辐射相干长度的2%更薄的特征。该技术在低相干光学层析测量中具有重要的应用价值。
We describe an imaging technique for few-cycle optical pulses. An object to be imaged is placed at the focus of a lens in one arm of a Michaelson interferometer. This introduces a phase shift of approximately π between the two arms of the interferometer, via the Gouy phase shift. The resulting destructive interference provides a nearly background-free measurement, and a dramatic enhancement in depth resolution. We demonstrate this using single-cycle pulses of terahertz radiation, and show that it is possible to resolve features thinner than 2% of the coherence length of the radiation. This technique could have important applications in low-coherence optical tomographic measurements.