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Subwavenumber charge-coupled device spectrometer calibration using molecular iodine laser-induced fluorescence
Joseph G Lambert1, Carlos Hernandez-Diaz, J Charles Williamson
1Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA.
The Review of Scientific Instruments
|February 2, 2010
Summary
A new method calibrates charge-coupled device (CCD) spectrometers using molecular iodine vapor fluorescence. This technique accurately converts pixel data to spectral coordinates for Raman spectroscopy applications.
Area of Science:
- Spectroscopy
- Analytical Chemistry
- Optical Physics
Background:
- Spectrometers with array detectors need calibration for pixel-to-spectral conversion.
- Accurate spectral data is crucial for applications like Raman spectroscopy.
Purpose of the Study:
- To develop and validate a robust calibration method for CCD spectrometers.
- To establish a reliable spectral coordinate conversion for Raman spectroscopy.
Main Methods:
- Utilized the laser-induced fluorescence (LIF) spectrum of molecular iodine (I2) vapor at room temperature.
- Identified over 360 I2 LIF calibration lines (510-645 nm) at 1 cm(-1) resolution.
- Employed a calibration function derived from optomechanical principles, outperforming polynomial fits.
Main Results:
- Achieved high accuracy and precision of +/-0.05 cm(-1) for spectral calibration.
- Demonstrated simultaneous recording of reference and signal spectra without crosstalk using spatial separation on the CCD.
- Validated the method for both laser light scattering and Raman spectra.
Conclusions:
- The I2 LIF method provides accurate and precise CCD spectrometer calibration.
- Simultaneous, spatially separated recording ensures independent calibration of each spectral image.
- This technique is highly suitable for demanding applications like Raman spectroscopy.
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