Spectrometer employing a micro-Fresnel lens

Nobuyuki Kitaura; Shiro Ogata; Yuzo Mori

doi:10.1117/12.188608

1 February 1995 Spectrometer employing a micro-Fresnel lens

Nobuyuki Kitaura, Shiro Ogata, Yuzo Mori

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Optical Engineering, Vol. 34, Issue 2, (February 1995). https://doi.org/10.1117/12.188608

Abstract

The dispersion characteristics of a diffractive micro-Fresnel lens (MFL) which is mass-produced for a laser diode collimator are examined for novel applications. The MFL's resolving power (Rayleigh criterion for resolution) at the design wavelength is calculated to be comparable to that of conventional dispersing prisms of the same size. A simple spectrometer with an MFL (4.5 mm diameter, 14.83 mm focal length at 0.78 μm design wavelength) and a movable pinhole (PH), is fabricated. The optimum PH diameter for both resolving power and light efficiency is 5 m, and the resolution and efficiency at the design wavelength are estimated to be 3.7 nm and 85%, respectively. The measurable spectral range determined from both the diffraction efficiency and the free spectral range of the MFL almost covers the entire visible region. The absorption spectrum of KMnO₄ solution is roughly obtained using the spectrometer. The space between the MFL and the PH, and the PH's movable length, which are required for spectroscopy, are as short as 20 and 7 mm, respectively. The simple and straight-line-structured spectroscopic system utilizing a more cost-efficient MFL may lead to the realization of less expensive and compact spectrometers.

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Nobuyuki Kitaura, Shiro Ogata, and Yuzo Mori "Spectrometer employing a micro-Fresnel lens," Optical Engineering 34(2), (1 February 1995). https://doi.org/10.1117/12.188608

Published: 1 February 1995

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