Optimizing resolution in an integrated blazed chirped Bragg grating spectrometer

James W. Field; Sam A. Berry; Rex H. S. Bannerman; Corin B. E. Gawith; Peter G. R. Smith; James C. Gates

doi:10.1117/12.2546195

25 February 2020 Optimizing resolution in an integrated blazed chirped Bragg grating spectrometer

James W. Field, Sam A. Berry, Rex H. S. Bannerman, Corin B. E. Gawith, Peter G. R. Smith, James C. Gates

Proceedings Volume 11283, Integrated Optics: Devices, Materials, and Technologies XXIV; 112831G (2020) https://doi.org/10.1117/12.2546195
Event: SPIE OPTO, 2020, San Francisco, California, United States

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.

Citation Download Citation

James W. Field, Sam A. Berry, Rex H. S. Bannerman, Corin B. E. Gawith, Peter G. R. Smith, and James C. Gates "Optimizing resolution in an integrated blazed chirped Bragg grating spectrometer", Proc. SPIE 11283, Integrated Optics: Devices, Materials, and Technologies XXIV, 112831G (25 February 2020); https://doi.org/10.1117/12.2546195

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