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M Jacquemet1, N Picqué, G Guelachvili
1Laboratoire de Photophysique Moléculaire, CNRS, Université de Paris-Sud, Orsay Cedex, France.
Optics Letters
|June 5, 2007
Summary
A novel laser system achieves highly sensitive gas detection using intracavity laser absorption spectroscopy. This method enables precise measurements over extended path lengths, advancing trace gas analysis capabilities.
Area of Science:
- Optics and Photonics
- Spectroscopy
- Laser Technology
Background:
- Intracavity laser absorption spectroscopy (ICLAS) offers high sensitivity for trace gas detection.
- Extending path lengths in ICLAS enhances detection limits but poses technical challenges.
- Room-temperature-operating semiconductor lasers provide a compact and versatile platform for spectroscopic applications.
Purpose of the Study:
- To demonstrate the application of a room-temperature vertical external cavity surface emitting laser (VECSEL) for ICLAS.
- To achieve high-resolution, simultaneous spectral coverage for sensitive gas analysis.
- To investigate the performance of the system at extended path lengths.
Main Methods:
- Utilized a 1550 nm VECSEL operating at room temperature.
- Employed time-resolved Fourier-transform interferometry for spectral analysis.
- Configured the system for ICLAS with equivalent path lengths up to 65 km.
Main Results:
- Achieved high-resolution spectral coverage of 17 nm simultaneously.
- Demonstrated a noise-equivalent absorption coefficient of 1.5 x 10(-10) cm(-1)Hz(-1/2) per spectral element at 1 s averaging.
- Successfully operated the system at an extended path length of 65 km, the longest reported for this technique.
Conclusions:
- The VECSEL-based ICLAS system provides a powerful tool for sensitive and high-resolution gas detection.
- Extended path lengths are feasible with this setup, significantly enhancing detection capabilities.
- This technology holds promise for various applications including environmental monitoring and industrial process control.
