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Hook method: improvement and simplification of the experimental setup
P van der Weijer1, R M Cremers
1Philips Research Laboratories, P.O. Box 80.000, 5600 JA Eindhoven, The Netherlands.
Applied Optics
|November 15, 1983
Summary
A modified hook method uses a grating and camera for high-dispersion anomalous dispersion measurements. This setup simplifies diagnostics and avoids focusing elements for sharper spectral analysis.
Area of Science:
- Optics and Spectroscopy
- Plasma Diagnostics
Background:
- The hook method is a standard technique for measuring anomalous dispersion.
- Conventional setups can be complex and require specialized equipment.
Purpose of the Study:
- To simplify and enhance the hook method for anomalous dispersion measurements.
- To improve the diagnostic capabilities of the hook method.
Main Methods:
- Replaced the spectrograph with a single grating and camera.
- Utilized large diffraction angles (near pi/2 rad).
- Employed a 4 m focal distance for hook spectrum projection.
Main Results:
- Achieved high dispersion (typically 200 mm/nm).
- Demonstrated the feasibility of omitting a post-diffraction focusing element.
- Maintained sharpness of the hook spectrum at large diffraction angles.
Conclusions:
- The modified hook method offers a simpler and more effective approach.
- High dispersion facilitates improved diagnostic accuracy.
- The setup is suitable for various applications requiring anomalous dispersion measurement.
