The optical frequency comb fibre spectrometer

Nicola Coluccelli (), Marco Cassinerio, Brandon Redding, Hui Cao, Paolo Laporta and Gianluca Galzerano
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Nicola Coluccelli: Dipartimento di Fisica-Politecnico di Milano
Marco Cassinerio: Dipartimento di Fisica-Politecnico di Milano
Brandon Redding: Yale University
Hui Cao: Yale University
Paolo Laporta: Dipartimento di Fisica-Politecnico di Milano
Gianluca Galzerano: Istituto di Fotonica e Nanotecnologie-CNR

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract Optical frequency comb sources provide thousands of precise and accurate optical lines in a single device enabling the broadband and high-speed detection required in many applications. A main challenge is to parallelize the detection over the widest possible band while bringing the resolution to the single comb-line level. Here we propose a solution based on the combination of a frequency comb source and a fibre spectrometer, exploiting all-fibre technology. Our system allows for simultaneous measurement of 500 isolated comb lines over a span of 0.12 THz in a single acquisition; arbitrarily larger span are demonstrated (3,500 comb lines over 0.85 THz) by doing sequential acquisitions. The potential for precision measurements is proved by spectroscopy of acetylene at 1.53 μm. Being based on all-fibre technology, our system is inherently low-cost, lightweight and may lead to the development of a new class of broadband high-resolution spectrometers.

Date: 2016
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DOI: 10.1038/ncomms12995

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