AI Article Synopsis
- This paper introduces a new and straightforward method to enhance spectral resolution in traditional static Fourier transform spectrometers through a process called heterodyning.
- Utilizing a single transmission grating placed at the image plane of two coherent beams from an interferometer, it splits the beams into diffraction orders to create a unique heterodyned interferogram.
- The study shows that the system's improved spectral resolution depends on the angle between the beams and the groove period of the grating, with experimental results validating the theoretical predictions.
Article Abstract
This paper presents a novel, to the best of our knowledge, and simple technique for achieving a higher spectral resolution in classical static Fourier transform spectrometers. This is achieved by heterodyning the frequency of a standard interferogram to a lower spatial frequency by placing a single transmission grating at the image plane of two mutually coherent beams produced by the interferometer. The grating splits the beams into diffraction orders, which overlap to produce the heterodyned interferogram, similar to that seen in techniques such as spatial heterodyne spectroscopy. The increase in spectral resolution for such a system is shown to be related to the angle between the beams and the groove period of the transmission grating. The theoretical performance of this design is compared with a proof-of-concept system built using off-the-shelf components and tested at visible wavelengths. The experimental results agree well with those produced from a theoretical simulation.
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| http://dx.doi.org/10.1364/AO.389949 | DOI Listing |
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