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Grating Sagnac Fourier transform spectrometer and its applications.

机译：光栅Sagnac Fourier变换光谱仪及其应用。

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摘要

The Active Hyperspectral Imaging (AHI) project at University of Hawaii uses the multi-color laser induced fluorescence to detect the low concentration molecules in the atmosphere. A high throughput, high spectral and time resolution receiver is required by this application. The stationary Fourier transform spectrometer (FTS) is one candidate for this purpose. Compared to the traditional FTS, the stationary FTS has the advantage of high time resolution. However, the spectral resolution of the stationary FTS has been relatively low in the past two decades. We have invented and developed a novel stationary FTS based on a modified Sagnac interferometer. The use of multiple diffraction gratings greatly improves the spectral resolution of the interferometer. A prototype of two-grating Sagnac ITS is built. The theoretical resolving power of the prototype is 0.957 x 106 at HeNe wavelength, which corresponds to the resolution of 495 MHz in frequency. The 700--1000 MHz (0.03 cm-1) resolution is obtained at 633 nm experimentally for the prototype. This is in full agreement with the theory and numerical simulation. The free spectral range of the prototype is more than 0.5 THz (>16.68 cm-1). The time resolution of the grating Sagnac FTS is transform-limited. The pulsed laser experiment demonstrates the 2 ∼ 3 nsec time resolution for the prototype of the two-grating Sagnac FTS.; The grating Sagnac FTS has wide tuning range. The same setup can cover the full visible spectral range by simply rotating the gratings. Although only visible spectrum is demonstrated, the grating Sagnac ITS can be used for UV and IR spectral measurement when different materials and detectors are used. The general theory on optimum N-grating Sagnac FTS is developed. The higher spectral resolution is possible when more gratings are used. A successful computer model is built up to help us design the system.; The characteristic of high spectral resolution and high time resolution makes the grating Sagnac FTS have the potential in applications such as real-time spectral monitoring, pulsed dye laser mode structure fluctuation study and the future free electron laser (FEL) mode decay measurement.
机译：夏威夷大学的主动高光谱成像（AHI）项目使用多色激光诱导的荧光来检测大气中的低浓度分子。该应用需要高吞吐量，高频谱和时间分辨率的接收器。固定傅立叶变换光谱仪（FTS）是用于此目的的一种选择。与传统的FTS相比，固定式FTS具有高时间分辨率的优势。但是，在过去的二十年中，固定式FTS的光谱分辨率一直较低。我们已经基于改进的Sagnac干涉仪发明并开发了一种新颖的固定式FTS。使用多个衍射光栅极大地提高了干涉仪的光谱分辨率。构建了两光栅Sagnac ITS的原型。原型的理论分辨力在HeNe波长为0.957 x 106，对应于495 MHz的频率分辨率。原型通过实验在633 nm处获得700--1000 MHz（<0.03 cm-1）的分辨率。这与理论和数值模拟完全吻合。原型的自由光谱范围大于0.5 THz（> 16.68 cm-1）。光栅Sagnac FTS的时间分辨率受变换限制。脉冲激光实验证明了两光栅Sagnac FTS原型的2到3 ns的时间分辨率。光栅Sagnac FTS具有宽广的调谐范围。只需旋转光栅，相同的设置即可覆盖整个可见光谱范围。尽管仅显示了可见光谱，但是当使用不同的材料和检测器时，光栅Sagnac ITS可以用于UV和IR光谱测量。提出了最佳N光栅Sagnac FTS的一般理论。当使用更多光栅时，更高的光谱分辨率是可能的。建立了成功的计算机模型以帮助我们设计系统。高光谱分辨率和高时间分辨率的特性使Sagnac FTS光栅在实时光谱监测，脉冲染料激光模式结构波动研究以及未来的自由电子激光（FEL）模式衰减测量等应用中具有潜力。

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  • 作者

    Ma, Huan.;

  • 作者单位

    University of Hawai'i at Manoa.;

  • 授予单位 University of Hawai'i at Manoa.;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 94 p.
  • 总页数 94
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

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