High-speed off-axis Cavity Ring-Down Spectroscopy with a re-entrant configuration for spectral resolution enhancement
| Autor: | Daniele Romanini, Jérémie Courtois, Ajmal Khan Mohamed |
|---|---|
| Přispěvatelé: | ONERA - The French Aerospace Lab [Châtillon], ONERA-Université Paris Saclay (COmUE), Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] (LIPhy), Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF) |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]
Materials science business.industry Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Atomic and Molecular Physics and Optics Cavity ring-down spectroscopy law.invention 010309 optics Resonator Optics law 0103 physical sciences Physics::Accelerator Physics Spontaneous emission Spectral resolution 0210 nano-technology business Spectroscopy Free spectral range Excitation ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Optics Express Optics Express, Optical Society of America-OSA Publishing, 2010, 18, pp.4845. ⟨10.1364/OE.18.004845⟩ |
| ISSN: | 1094-4087 |
| Popis: | Monitoring of changing samples by Cavity Ring-Down Spectroscopy (CRDS) is possible using fast frequency scans of the laser and/or the cavity resonance. Mode-matched cavity excitation improves performance of fast CRDS but data-points result separated by the cavity Free Spectral Range (FSR): low pressure samples demand long cavities. We demonstrate fast CRDS with off-axis injection of a “re-entrant” resonator yielding FSR/N data-points separation. Our N = 4 short-cavity setup is found to perform well compared with other fast-CRDS implementations. Interestingly, the intrinsic chirped ringing affecting ring-down signals in mode-matched fast-CRDS disappear with off-axis injection. This is due to a fine splitting of the re-entrant-cavity degenerate groups of modes by astigmatism. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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