Current scalar coronagraph focal plane mask designs are performance-limited by chromaticity. We investigate the effects of adding central Roddier and dual zone phase dimples to scalar masks to improve broadband performance by suppressing the chromatic stellar leakage. We present hybrid designs with radial phase dimples integrated with the sawtooth vortex, wrapped vortex, and cosine phase mask. We show that, using these dimples, it is possible to substantially improve the broadband contrast performance of scalar phase masks. We also show that, although adding a phase dimple does not increase the sensitivity to low-order aberrations, suppressing the central leakage of scalar vortex coronagraphs does not restore the aberration sensitivities to their notional state.

中文翻译：

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在标量日冕仪相位掩模上添加径向相位凹痕的好处

当前的标量日冕仪焦平面掩模设计的性能受到色度的限制。我们研究了在标量掩模中添加中央罗迪尔和双区相位凹坑的效果，以通过抑制彩色恒星泄漏来提高宽带性能。我们提出了径向相位凹坑与锯齿涡流、包裹涡流和余弦相位掩模集成的混合设计。我们表明，使用这些凹痕可以显着提高标量相位掩模的宽带对比度性能。我们还表明，虽然添加相位凹坑并不会增加对低阶像差的敏感性，但抑制标量涡旋日冕仪的中心泄漏并不能将像差敏感性恢复到其概念状态。