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High-speed cavity ringdown spectroscopy with increased spectral resolution by simultaneous laser and cavity tuning
Optics Express
|June 5, 2009
Summary
High-speed cavity ringdown spectroscopy enables analysis of rapid chemical processes. This new continuous-wave design uses fast laser tuning and a swept optical cavity for improved measurement speed and spectral resolution.
Area of Science:
- Spectroscopy
- Chemical Sensing
- Physical Chemistry
Background:
- Cavity ringdown spectroscopy (CRDS) is an effective gas-sensing technique.
- Current CRDS methods require faster measurement speeds for analyzing transient phenomena.
Purpose of the Study:
- To develop a high-speed continuous-wave cavity ringdown spectroscopy system.
- To enable the analysis of fast chemical processes with improved spectral resolution.
Main Methods:
- Implemented a novel continuous-wave CRDS design.
- Utilized fast laser frequency tuning and a rapidly swept optical cavity.
- Investigated the system numerically and experimentally.
Main Results:
- Achieved high-speed gas sensing with refined spectral resolution.
- Successfully detected a forbidden transition of molecular oxygen near 766 nm.
- Demonstrated a 2-ms single sweep for laser frequency tuning.
Conclusions:
- The developed CRDS system meets the requirements for probing rapid chemical processes.
- The new design offers a simple and versatile instrument for high-speed sensing.
- This advancement expands the applicability of CRDS to dynamic chemical analyses.
