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Analysis of grating doublets for achromatic beam-splitting.
Optics Express
|September 15, 2015
Summary
Achromatic grating doublets with binary or multi-level phase profiles are easier to fabricate than continuous-profile designs. Optimized grating heights significantly improve performance, even with fabrication errors.
Area of Science:
- Optics and Photonics
- Diffractive Optics
Background:
- Achromatic beam-splitting grating doublets are crucial optical components.
- Fabrication challenges exist for continuous-profile gratings.
Purpose of the Study:
- To analyze the fabrication sensitivity of achromatic grating doublets.
- To compare continuous-phase and binary-phase grating designs.
Main Methods:
- Sensitivity analysis to lateral shifts between grating layers.
- Evaluation of grating layer height fabrication errors.
Main Results:
- Continuous-profile grating doublets exhibit high sensitivity to lateral shifts.
- Binary, multi-level, and blazed grating doublets show improved robustness.
- Optimized grating heights can compensate for fabrication errors, enhancing performance significantly.
Conclusions:
- Binary and multi-level phase grating doublets are more practical for fabrication.
- Design strategies can mitigate fabrication errors in achromatic grating doublets.
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