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31 October 1997 Synthetic infrared spectra for correlation spectroscopy
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As a first step toward the development of a new remote sensing technique that we call 'holographic correlation spectroscopy,' we demonstrate that diffractive optics can be used to synthesize the IR spectra of real compounds. In particular, we have designed, fabricated, and characterized a diffractive element that successfully reproduces the major features of the spectrum of gaseous HF in the region between 3600 cm-1 and 4300 cm-1. The reflection-mode diffractive optic consists of 4096 lines, each 4.5 micrometers wide, at 16 discrete depths relative to the substrate, and was fabricated on a silicon wafer using anisotropic reactive ion-beam etching in a four-mask-level process. We envision the use diffractive elements of this type to replace the cumbersome reference cells of conventional correlation spectroscopy and thereby enable a new class of compact and versatile correlation spectrometers.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael B. Sinclair, Michael Alfred Butler, Antonio J. Ricco, Stanley H. Kravitz, W. J. Zubrzycki, and Mial E. Warren "Synthetic infrared spectra for correlation spectroscopy", Proc. SPIE 3118, Imaging Spectrometry III, (31 October 1997);

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