✦ LIBER ✦

Binary phase shaping for selective single-beam CARS spectroscopy and imaging of gas-phase molecules

✍ Scribed by Paul J. Wrzesinski; Dmitry Pestov; Vadim V. Lozovoy; Bingwei Xu; Sukesh Roy; James R. Gord; Marcos Dantus

Publisher: John Wiley and Sons
Year: 2011
Tongue: English
Weight: 342 KB
Volume: 42
Category: Article
ISSN: 0377-0486
DOI: 10.1002/jrs.2709

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✦ Synopsis

Abstract

We report on mode‐selective single‐beam coherent anti‐Stokes Raman scattering spectroscopy of gas‐phase molecules. Binary phase shaping (BPS) is used to produce single‐mode excitation of O~2~, N~2~, and CO~2~ vibrational modes in ambient air and gas‐phase mixtures, with high‐contrast rejection of off‐resonant Raman modes and efficient nonresonant‐background suppression. In particular, we demonstrate independent excitation of CO~2~ Fermi dyads at ∼1280 and ∼1380 cm^−1^ and apply BPS for high‐contrast imaging of CO~2~ jet in ambient air. Copyright © 2010 John Wiley & Sons, Ltd.

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✍ Sukesh Roy; Paul J. Wrzesinski; Dmitry Pestov; Marcos Dantus; James R. Gord 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 258 KB 👁 1 views

## Abstract Coherent anti‐Stokes Raman scattering (CARS) spectroscopy of gas‐phase CO~2~ is demonstrated using a single femtosecond (fs) laser beam. A shaped ultrashort laser pulse with a transform‐limited temporal width of ∼7 fs and spectral bandwidth of ∼225 nm (∼3500 cm^−1^) is employed for simu