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Determination of the instrument function of a grating spectrometer by using white-light interferometry
Applied Optics
|July 1, 1997
Summary
Researchers determined a grating spectrometer's instrument function under partial coherence using spectral-interference. This method precisely defines the spectrometer's response and optimal working conditions for accurate spectral output.
Area of Science:
- Spectroscopy
- Optical Metrology
- Interferometry
Background:
- Grating spectrometers are crucial for spectral analysis.
- Finite slit widths and partial coherence affect spectrometer accuracy.
- Characterizing the instrument function is essential for reliable spectral data.
Purpose of the Study:
- To determine the instrument function of a grating spectrometer with finite slit widths under partial coherent illumination.
- To identify the optimal working region of the spectrometer for minimizing spectral distortion.
Main Methods:
- Utilized a spectral-interference technique with white light.
- Employed a Michelson interferometer with variable path delay to generate spectral-interference fringes.
- Applied deconvolution to spectral visibility data obtained for varying slit widths.
Main Results:
- Successfully determined the exact form and frequency width of the spectrometer's instrument function.
- Identified the specific operating region yielding the least distorted output spectrum.
- Quantified the impact of finite slit widths on spectrometer performance.
Conclusions:
- The spectral-interference technique is effective for characterizing grating spectrometer instrument functions.
- Understanding the instrument function allows for correction of spectral distortions.
- This work provides a method for optimizing spectrometer usage and ensuring data integrity.
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