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FIRST (Fibered Imager foR a Single Telescope instrument) is a post-AOinstrument that enables high contrast imaging and spectroscopy at spatialscales below the diffraction limit. FIRST achieves sensitivity and accuracy bya unique combination of sparse aperture masking, spatial filtering bysingle-mode fibers and cross-dispersion in the visible. The telescope pupil isdivided into sub-pupils by an array of microlenses, coupling the light intosingle-mode fibers. The output of the fibers are rearranged in a non redundantconfiguration, allowing the measurement of the complex visibility for everybaseline over the 600-900 nm spectral range. A first version of this instrumentis currently integrated to the Subaru Extreme AO bench (SCExAO). This paperfocuses on the on-going instrument upgrades and testings, which aim atincreasing the instrument's stability and sensitivity, thus improving thedynamic range. FIRSTv2's interferometric scheme is based on a photonic chipbeam combiner. We report on the laboratory characterization of two differenttypes of 5-input beam combiner with enhanced throughput. The interferometricrecombination of each pair of sub-pupils is encoded on a single output. Thus,to sample the fringes we implemented a temporal phase modulation by pistoningthe segmented mirrors of a Micro-ElectroMechanical System (MEMS). By couplinghigh angular resolution and spectral resolution in the visible, FIRST offersunique capabilities in the context of the detection and spectralcharacterization of close companions, especially on 30m-class telescopes.

Laboratory characterization of FIRSTv2 photonic chip for the study of substellar companions