The optical vortex coronagraph (OVC) is an innovative instrument that can be applied to both space and ground-based telescopes for direct imaging of planets around bright stars. OVC rejects the light of the on-axis star without altering that of off-axis sources, means of a spiral phase plate (SPP) used as a phase modyfing device (PMD). We present the fabrication process made by lithographic nanofabrication and tests for the characterization of two different high-quality SPPs.
Fabrication and testing of phase masks for optical vortex coronagraph to observe extrasolar planets
MARI, ELETTRA;TAMBURINI, FABRIZIO;BARBIERI, CESARE;BIANCHINI, ANTONIO;ROMANATO, FILIPPO
2010
Abstract
The optical vortex coronagraph (OVC) is an innovative instrument that can be applied to both space and ground-based telescopes for direct imaging of planets around bright stars. OVC rejects the light of the on-axis star without altering that of off-axis sources, means of a spiral phase plate (SPP) used as a phase modyfing device (PMD). We present the fabrication process made by lithographic nanofabrication and tests for the characterization of two different high-quality SPPs.
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