title: High-finesse sub-GHz-resolution spectrometer employing VIPA etalons of different dispersion.
abstract: We report a novel configuration of a two-stage virtually imaged phased array spectrometer that enables high-throughput sub-GHz spectroscopy at a high finesse (>750). Two etalons with different free spectral range and different dispersion are arranged in an orthogonal direction and spread the spectrum across two dimensions, with a greatly improved rejection ratio of white-light background noise. A proof-of-concept application for Brillouin spectroscopy is demonstrated.
authors.forename: Kim
authors.initials: K
authors.lastname: Berghaus
authors.forename: Jitao
authors.initials: J
authors.lastname: Zhang
authors.forename: Seok H
authors.initials: SH
authors.lastname: Yun
authors.forename: Giuliano
authors.initials: G
authors.lastname: Scarcelli
mesh_terms: D055096:Optical Devices; D013057:Spectrum Analysis / Q000295:instrumentation*