104 Vol. 34, No. 1 / January 2017 / Journal of the Optical Society of America B Review Gas-phase broadband spectroscopy using active sources: progress, status, and applications [Invited] 1, 1,4 2 2 KEVIN C. COSSEL, *ELEANOR M. WAXMAN, IAN A. FINNERAN, GEOFFREY A. BLAKE, 3 1 JUN YE, AND NATHAN R. NEWBURY 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA 2Division of Chemistry & Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA 3JILA, National Institute of Standards and Technology and University of Colorado, Department of Physics, University of Colorado, Boulder, Colorado 80309, USA 4e-mail:
[email protected] *Corresponding author:
[email protected] Received 19 September 2016; revised 1 November 2016; accepted 15 November 2016; posted 15 November 2016 (Doc. ID 275946); published 14 December 2016 Broadband spectroscopy is an invaluable tool for measuring multiple gas-phase species simultaneously. In this work we review basic techniques, implementations, and current applications for broadband spectroscopy. We discuss com- ponents of broadband spectroscopy including light sources, absorption cells, and detection methods and then discuss specific combinations of these components in commonly used techniques. We finish this review by discussing po- tential future advances in techniques and applications of broadband spectroscopy. © 2016 Optical Society of America OCIS codes: (300.1030) Absorption; (120.6200) Spectrometers and spectroscopic instrumentation; (120.4640) Optical instruments; (300.6390) Spectroscopy, molecular. https://doi.org/10.1364/JOSAB.34.000104 1. INTRODUCTION spectral bandwidth allows for the simultaneous detection of Molecular spectroscopy has been shown to be a powerful multiple species. This enables a single instrument to serve many analytical tool with a wide range of applications.