Date

2021-9

Author

Kahraman, Sıddık Süleyman

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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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.

Subject Keywords

Multimode fiber, Spectrometer, Wavefront shaping

URI

https://hdl.handle.net/11511/92077

Collections

Graduate School of Natural and Applied Sciences, Thesis