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Opt Lett. 2015 Oct 1;40(19):4436-9. doi: 10.1364/OL.40.004436.

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.

PMID:
26421550
PMCID:
PMC4780046
DOI:
10.1364/OL.40.004436
[Indexed for MEDLINE]
Free PMC Article

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