29-01-2021 #

First Nulling Trials #

In order to Validate some of our ideas on the coronagraph approach for RISTRETTO, we have first set-up a test bench trying to achieve good nulling contrast levels using a S-630-HP fiber, the one we have selected for the instrument.

A PSF, has been produced, by a fiber test set-up with an F/4 beam (the optical quality was far from perfect). This allowed us to test some precise translation system and map the coupling of a fiber when wandering around the PSf.

This way we showed that our measurement system and our test environment are stable enough to measure long term nulls. This is very encouraging !