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Proceedings Paper

Optimizing resolution in an integrated blazed chirped Bragg grating spectrometer
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Paper Abstract

We present an investigation into the resolution of blazed chirped Bragg grating spectrometers. These are dispersive spectrometers that diffract light out of a waveguide at a wavelength dependent angle, whilst focusing the light. The spectral resolution is found to be inversely proportional to grating length; previously used fabrication schemes limited the grating length (and hence resolution) when creating compact devices. We propose and implement a solution to this problem by varying the blaze angle of a Bragg grating along its length. Initial results show the fabrication of longer gratings (while preserving focal length) and an increase in FWHM resolution from 0.57 nm to 0.52 nm. This increase in resolution is thought to be limited by the appearance of aberrations which can be corrected for in future devices.

Paper Details

Date Published: 25 February 2020
PDF: 6 pages
Proc. SPIE 11283, Integrated Optics: Devices, Materials, and Technologies XXIV, 112831G (25 February 2020); doi: 10.1117/12.2546195
Show Author Affiliations
James W. Field, Univ. of Southampton (United Kingdom)
Sam A. Berry, Univ. of Southampton (United Kingdom)
Rex H. S. Bannerman, Univ. of Southampton (United Kingdom)
Corin B. E. Gawith, Univ. of Southampton (United Kingdom)
Peter G. R. Smith, Univ. of Southampton (United Kingdom)
James C. Gates, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 11283:
Integrated Optics: Devices, Materials, and Technologies XXIV
Sonia M. García-Blanco; Pavel Cheben, Editor(s)

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