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Dispersion compensation in moving-optical-wedge Fourier transform spectrometer
Tarek A Al-Saeed1, Diaa A Khalil
1Biomedical Engineering Department, Faculty of Engineering, Helwan University, Ain Helwan, Helwan, Egypt. tarek1971@ieee.org
Applied Optics
|July 14, 2009
Summary
Material dispersion affects optical-wedge Fourier transform spectrometers. A new numerical technique overcomes limitations of classical dispersion compensation methods, showing unique spatial domain effects not seen in Michelson interferometers.
Area of Science:
- Optical spectroscopy
- Interferometry
- Fourier transform spectroscopy
Background:
- Material dispersion impacts spectrometer performance.
- Classical dispersion compensation methods are optimized for Michelson interferometers.
Purpose of the Study:
- Investigate material dispersion effects on moving-optical-wedge Fourier transform spectrometers.
- Evaluate the efficacy of classical numerical dispersion compensation techniques for wedge interferometers.
- Develop a novel numerical method to address dispersion-related errors.
Main Methods:
- Numerical evaluation of spectra using a test spectrum source.
- Analysis of dispersion compensation errors.
- Development and testing of a new numerical compensation technique.
Main Results:
- Classical dispersion compensation is inefficient for wedge interferometers, especially with strong dispersion.
- A new numerical technique effectively overcomes limitations of the classical method.
- Observed spatial domain interferogram shrinkage, contrasting with Michelson interferometer behavior.
Conclusions:
- Material dispersion significantly influences wedge interferometer performance.
- The proposed numerical technique offers improved dispersion compensation for wedge interferometers.
- Wedge interferometers exhibit unique spatial domain characteristics due to dispersion.
