Trace gas sensing using diode-pumped collinearly detected spontaneous Raman scattering enhanced by a multipass cell
| Autor: | Juan Gomez Velez, Andreas Muller |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Blue laser
Multi-mode optical fiber Materials science business.industry 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Atomic and Molecular Physics and Optics Spectral line law.invention Trace gas 010309 optics symbols.namesake Optics law 0103 physical sciences symbols Atomic physics 0210 nano-technology Raman spectroscopy business Raman scattering Diode |
| Zdroj: | Optics Letters. 45:133 |
| ISSN: | 1539-4794 0146-9592 |
| DOI: | 10.1364/ol.45.000133 |
| Popis: | A simple but highly effective method for enhancement of spontaneous Raman scattering from gases is described. It employs a multimode blue laser diode that receives feedback from a near-concentric bidirectional multipass cavity in such a way as to generate a circulating power on the order of 100 W for a sample volume of 10 m m 3 . The feedback, provided via a volume Bragg grating, reduces the laser bandwidth to 4 c m − 1 . Spectra of spontaneous Raman scattering from ambient atmospheric air, detected collinearly with the pump, were recorded with a limit of detection below 1 ppm. The performance of the setup is further illustrated through detection of acetone, methane, and isotopic carbon dioxide in breath. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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