Differential Optical Spectrometer Based on Critical Angle Dispersion
Fathy, A; Sabry, YM; Khalil D; Bourouina T.;
Abstract
We introduce and prove the concept of differential optical spectrometer based on critical angle dispersion. A long waveguide of beveled input and output interfaces is used, where the light to be detected is oriented in the vicinity of waveguide numerical aperture. The incidence angle is swept, and a single detector is used for detection from the other side. Theoretical resolution and resolving power were deduced. The concept was applied to an off-the-shelf ZnSe crystal. Validation is proven by retrieving reference wavelengths of two lasers as well as the absorption spectrum of a reference material.
Other data
Title | Differential Optical Spectrometer Based on Critical Angle Dispersion | Authors | Fathy, A; Sabry, YM; Khalil D ; Bourouina T. | Keywords | Diffraction gratings; Diffraction; Detectors; Mirrors; Optical waveguides; Optical interferometry; Measurement by laser beam; Material dispersion; resolving power; spectrometer; total internal reflection; HIGH-RESOLUTION; FIBER | Issue Date | 2021 | Publisher | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | Journal | JOURNAL OF LIGHTWAVE TECHNOLOGY | ISSN | 0733-8724 | DOI | 10.1109/JLT.2021.3057787 | Scopus ID | 2-s2.0-85100865455 | Web of science ID | WOS:000641969000029 |
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