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A Multimodal Wide-Field Fourier-Transform Raman Microscope
Published on: December 30, 2025
Simple two-dimensional-imaging spectrograph with wedged narrow band filters
1Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, Brehova 7, 115 19 Prague 1, Czech Republic. divoky@fzu.cz
The Review of Scientific Instruments
|January 7, 2009
Summary
A modified spectrograph uses wedged filters for precise 2D spectral imaging. This practical innovation achieves sub-micrometer precision for analyzing spatial beam distribution and angular dispersion in optical systems.
Area of Science:
- Optical Physics
- Spectroscopy
- Metrology
Background:
- Traditional spectrographs often lack the precision required for detailed spatial analysis.
- Characterizing beam distribution and angular dispersion is crucial in laser systems and optical design.
Purpose of the Study:
- To present a practical modification of a spectrograph for enhanced spectral imaging.
- To achieve sub-micrometer precision in two-dimensional spectral measurements.
- To demonstrate the device's capability in evaluating quantities transformable into spatial images.
Main Methods:
- Incorporation of a set of wedged narrow band filters into a standard spectrograph.
- Development of a simple spectroscopic device for two-dimensional imaging spectral measurements.
- Application of the modified spectrograph to measure angular dispersion.
Main Results:
- The modified spectrograph enables two-dimensional spectral measurements with potential subpixel precision of a few micrometers.
- The device successfully evaluated the angular dispersion of a femtosecond laser oscillator.
- The system also accurately measured the angular dispersion of a simple optical wedge.
Conclusions:
- The spectrograph modification offers a practical and precise method for spectral imaging.
- The device is effective for analyzing spatial beam distribution and angular dispersion.
- This technique has potential applications in laser diagnostics and optical system characterization.
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