Enhancing the Resolution of Multimode Fiber Based Spectrometers

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2021-9
Kahraman, Sıddık Süleyman
Speckle-based spectrometers are shown to reach resolving powers that exceed the state-of-the-art grating spectrometers. These spectrometers offer high-resolution by relying on a complex spectral to spatial mapping. Multimode fibers (MMFs) reduce losses that occur from scattering of light and can also provide spectral to spatial mapping. The resolution of a MMF based spectrometer can be increased using longer fibers that in return makes them susceptible to environmental changes. This study introduces techniques based on wavefront shaping (WFS) to enhance the spectral resolution without changing the fiber parameters. The methods introduced here manage to enhance the spectral resolution of a MMF based spectrometer by nearly twice and demonstrate down to 5 pm resolution reaching a record resolution in the telecom range.
Citation Formats
S. S. Kahraman, “Enhancing the Resolution of Multimode Fiber Based Spectrometers,” M.S. - Master of Science, Middle East Technical University, 2021.