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Optical Engineering • Open Access

Ultraminiature one-shot Fourier-spectroscopic tomography
Author(s): Shun Sato; Wei Qi; Natsumi Kawashima; Kosuke Nogo; Satsuki Hosono; Akira Nishiyama; Kenji Wada; Ichiro Ishimaru

Paper 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.

Paper Details

Date Published: 19 February 2016
PDF: 8 pages
Opt. Eng. 55(2) 025106 doi: 10.1117/1.OE.55.2.025106
Published in: Optical Engineering Volume 55, Issue 2
Show Author Affiliations
Shun Sato, Kagawa Univ. (Japan)
Wei Qi, Kagawa Univ. (Japan)
Natsumi Kawashima, Kagawa Univ. (Japan)
Kosuke Nogo, Kagawa Univ. (Japan)
Satsuki Hosono, Kagawa Univ. (Japan)
Akira Nishiyama, Kagawa Univ. (Japan)
Kenji Wada, Kagawa Univ. (Japan)
Ichiro Ishimaru, Kagawa Univ. (Japan)

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