Methods to improve burst-mode laser spectral purity for high-speed gas-phase filtered Rayleigh scattering
In the filtered Rayleigh scattering (FRS) technique, Doppler or homogeneously broadened light from weak molecular scattering is separated from orders-of-magnitude stronger elastic scattering from surfaces, windows, particles, and/or droplets using a narrowband filter. In this work, high-speed detect...
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Veröffentlicht in: | Optics letters 2023-08, Vol.48 (15), p.4005-4008 |
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Sprache: | eng |
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Zusammenfassung: | In the filtered Rayleigh scattering (FRS) technique, Doppler or homogeneously broadened light from weak molecular scattering is separated from orders-of-magnitude stronger elastic scattering from surfaces, windows, particles, and/or droplets using a narrowband filter. In this work, high-speed detection of such weak molecular scattering is enabled by a burst-mode laser system that can achieve a spectral purity of ∼0.999999. This allows for an additional two orders of magnitude of attenuation from a narrowband iodine molecular filter for high-speed detection of gas-phase FRS in the presence of direct surface scattering at 532 nm. The methodology, system characterization, and feasibility of single-shot gas-phase FRS at 100 kHz or higher are presented and discussed. |
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ISSN: | 0146-9592 1539-4794 |
DOI: | 10.1364/OL.487369 |