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Testing an optical window of a small wedge angle: effect of multiple reflections
Applied Optics
|September 11, 2010
Summary
Optical measurements can be improved by eliminating window reflections. Tilting the window and return mirror effectively removes multiple reflections, even with small wedge angles, enhancing measurement accuracy.
Area of Science:
- Optical Engineering
- Metrology
- Interferometry
Background:
- Multiple reflections between optical window surfaces cause fixed pattern errors in measurements.
- Existing methods using large wedges are ineffective for small wedge angles (arcseconds).
Purpose of the Study:
- To develop and present a method for removing multiple reflections from optical windows.
- To address the limitations of wedge-based methods for small wedge angles.
Main Methods:
- Theoretical analysis of multiple reflections in optical systems.
- Experimental validation involving precise tilting of the window and return mirror.
Main Results:
- A novel technique effectively eliminates multiple reflections by optimizing window and mirror tilt angles.
- The method is proven effective even for windows with very small wedge angles.
Conclusions:
- Proper angular alignment of optical windows and return mirrors is crucial for accurate optical measurements.
- This technique provides a viable solution for mitigating reflection errors in sensitive optical setups.
