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Achromatic Wollaston prism beam splitter using polarization gratings
Optics Letters
|October 18, 2016
Summary
This study presents an achromatized Wollaston prism beam splitter using a polarization grating. This innovative method reduces dispersion effectively, offering a thinner and more efficient optical component.
Area of Science:
- Optics and Photonics
- Optical Engineering
Background:
- Wollaston prisms are essential for beam splitting but suffer from chromatic dispersion.
- Existing refractive methods for achromatization can be complex and bulky.
Purpose of the Study:
- To develop a novel method for achromatizing Wollaston prisms.
- To reduce chromatic dispersion in beam splitters using a polarization grating.
Main Methods:
- Combining a Wollaston prism with a polarization grating.
- Formulating a model for the achromatized grating prism.
- Experimental validation using a calcite Wollaston prism and a polarization grating.
Main Results:
- Achieved achromatization of a calcite Wollaston prism.
- Reduced primary dispersion by approximately 6.5 times across visible wavelengths (486-656 nm).
- Demonstrated a thinner achromatized assembly compared to refractive methods.
Conclusions:
- The polarization grating method offers an effective way to achromatize Wollaston prisms.
- This technique simplifies achromatization, requiring only one birefringent crystal type.
- The resulting achromatized beam splitter is thinner and maintains performance.
