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19 February 2016 Ultraminiature one-shot Fourier-spectroscopic tomography
Shun Sato, Wei Qi, Natsumi Kawashima, Kosuke Nogo, Satsuki Hosono, Akira Nishiyama, Kenji Wada, Ichiro Ishimaru
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Optical Engineering, Vol. 55, Issue 2, 025106 (February 2016). https://doi.org/10.1117/1.OE.55.2.025106
Abstract
We propose one-shot Fourier-spectroscopic tomography as a method of ultraminiature spectroscopic imaging. The apparatus used in this technique consists solely of a glass slab with a portion of its surface polished at a certain inclination angle—a device we term a relative-inclination phase shifter—simply mounted on an infinite-distance-corrected optical imaging system. For this reason, the system may be ultraminiaturized to sizes on the order of a few tens of millimeters. Moreover, because our technique uses a near-common-path wavefront-division phase-shift interferometer and has absolutely no need for a mechanical drive unit, it is highly robust against mechanical vibrations. In addition, because the proposed technique uses Fourier-transform spectroscopy, it offers highly efficient light utilization and an outstanding signal-to-noise ratio compared to devices that incorporate distributed or hyperspectral acousto-optical tunable filters. The interferogram, which is a pattern formed by interference of waves at all wavelengths, reflects the spatial variation in the intensity of the interference depending on the magnitude of the phase shift. We first discuss the design of the phase shifter and the results of tests to validate the principles underlying one-shot Fourier-spectroscopic tomography. We then report the results of one-dimensional spectroscopic imaging using this technique.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Shun Sato, Wei Qi, Natsumi Kawashima, Kosuke Nogo, Satsuki Hosono, Akira Nishiyama, Kenji Wada, and Ichiro Ishimaru "Ultraminiature one-shot Fourier-spectroscopic tomography," Optical Engineering 55(2), 025106 (19 February 2016). https://doi.org/10.1117/1.OE.55.2.025106
Published: 19 February 2016
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Cited by 12 scholarly publications and 1 patent.
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KEYWORDS
Phase shifts
Tomography
Imaging spectroscopy
Spectroscopes
Spectroscopy
Imaging systems
Phase interferometry
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