Laser-based optical technique for proximal collection of chemical signatures

Bradley Arnold; Sara Tahir; Sebastian Lecha

doi:10.1117/12.2663203

14 June 2023 Laser-based optical technique for proximal collection of chemical signatures

Bradley Arnold, Sara Tahir, Sebastian Lecha

Proceedings Volume 12541, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIV; 1254105 (2023) https://doi.org/10.1117/12.2663203
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

Raman spectra were measured using a novel experimental configuration. This configuration allows many of the difficulties associated with the collection of Raman spectra under proximal conditions to be mitigated. Large sample areas can be imaged into the detection system allowing low intensity (high power) excitation sources to be used while simultaneously avoiding sample degradation and multi-photon absorption effects. Such large detection areas allow high numbers of molecular scatters to be probed even with minimal penetration depth. Overlap of excitation and detection areas avoids alignment difficulties that plague conventional Raman while removing the focal plane making detection from near contact to proximal distances possible. Justification for the success of this optical configuration will be described along with supporting data.

Conference Presentation

Citation Download Citation

Bradley Arnold, Sara Tahir, and Sebastian Lecha "Laser-based optical technique for proximal collection of chemical signatures", Proc. SPIE 12541, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIV, 1254105 (14 June 2023); https://doi.org/10.1117/12.2663203

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