Design of Achromatic Waveplates for ATST Near IR Filter System

Details Design of Achromatic Waveplates for ATST Near IR Filter System Design of Achromatic Waveplates for ATST Near IR Filter System

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.2024m&link_type=abstract

American Astronomical Society, SPD meeting #34, #20.24; Bulletin of the American Astronomical Society, Vol. 35, p.848

Computer Science

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Scientific paper

Achromatic waveplates play one of the central roles in constructing universal birefringent filters (UBF). Although it's been developed very well by several authors in the last decades, the mechanisms and detailed techniques which can realize the achromatism are still not clearly categorized. Such waveplates for Infrared do not exist yet. In the recent development of a InfraRed High Resolution Magnetograph at BBSO, it is realized that a standard approach of designing achromatic waveplate is needed not only for the IRHRM, but more importantly, for the Near IR Tunable Filter for ATST.
There are several theoretical methods which are available to describe the behavior of waveplates and polarization status of field, including algebraic tools (Jones Algebra, Muler Matrix, Stokes Vector), and geometrical approach (Poincere Sphere, which is Complex Analysis in fact). By using these methods, it can be proved that a combination of waveplates could have much better achromatic performance than a single component has.
Since the simulation of the combination of waveplates gets more and more complex, a computer program software package for designing achromatic waveplates is developed. Compared to the most popular commercial software package, such as ZEMAX which uses ray-tracing approach, the recently developed software tools is based on Transfer Functions of Optical Systems, which will be more efficient than ray-tracing approach.

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