Diffractive optical elements for the production of synthetic spectra

Michael B. Sinclair; Michael Alfred Butler; Antonio J. Ricco; Stanley H. Kravitz; W. J. Zubrzycki

doi:10.1117/12.274400

15 May 1997 Diffractive optical elements for the production of synthetic spectra

Michael B. Sinclair, Michael Alfred Butler, Antonio J. Ricco, Stanley H. Kravitz, W. J. Zubrzycki

Proceedings Volume 3010, Diffractive and Holographic Device Technologies and Applications IV; (1997) https://doi.org/10.1117/12.274400
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

We demonstrate that computer-generated diffractive optical elements can be used to synthesize the infrared spectra of real compounds. In particular, we describe a modified phase- retrieval algorithm that we have used to design diffractive elements of this type and we present experimental results for a diffractive optic which is capable of synthesizing the infrared spectrum of HF 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 (from 0 to 1.2 micrometer), and was fabricated on a silicon wafer using anisotropic reactive ion-beam etching in a four-mask-level process. We propose the use of such elements to replace reference cells in a new type of correlation spectroscopy that we call 'holographic correlation spectroscopy.' Storage of a large number of diffractive elements, each producing a synthetic spectrum corresponding to a different target compound, in compact disk-like format, will allow a spectrometer of this type to rapidly determine the composition of unknown samples. Further, this approach can be used to perform correlation- based measurements of hazardous or transient species, for which conventional correlation spectroscopy is impractical.

Citation Download Citation

Michael B. Sinclair, Michael Alfred Butler, Antonio J. Ricco, Stanley H. Kravitz, and W. J. Zubrzycki "Diffractive optical elements for the production of synthetic spectra", Proc. SPIE 3010, Diffractive and Holographic Device Technologies and Applications IV, (15 May 1997); https://doi.org/10.1117/12.274400

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