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Updated: May 25, 2026

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
Published on: December 1, 2023
PCF-based cavity enhanced spectroscopic sensors for simultaneous multicomponent trace gas analysis.
Walter M Nakaema1, Zuo-Qiang Hao, Philipp Rohwetter
1Institute of Experimental Physics, Free University of Berlin, Arnimallee 14, 14195 Berlin, Germany. walternak@usp.br
A new multiwavelength, multicomponent Cavity Ring-Down Spectroscopy (CRDS) gas sensor was developed using a compact supercontinuum light source. This sensor enables simultaneous detection of gases like oxygen and water vapor in ambient air.
Area of Science:
- Optical Spectroscopy
- Laser Spectroscopy
- Environmental Sensing
Background:
- Cavity Ring-Down Spectroscopy (CRDS) is a highly sensitive technique for gas analysis.
- Developing multiwavelength and multicomponent CRDS systems is crucial for comprehensive atmospheric monitoring.
Purpose of the Study:
- To construct and demonstrate a novel multiwavelength, multicomponent CRDS gas sensor.
- To showcase its capability for simultaneous detection of multiple gases in ambient air.
Main Methods:
- Utilized a compact photonic crystal fibre supercontinuum light source.
- Employed a single radiation source, cavity, and detection unit (spectrograph with ICCD camera).
- Operated the cavity in a "quasi continuum" mode and used long camera gate widths to optimize signal-to-noise ratio.
Main Results:
- Successfully demonstrated simultaneous measurement of molecular oxygen and water vapor absorption spectra.
- Addressed and resolved issues related to multimodal cavity excitation and signal-to-noise optimization.
- The sensor design is simple, featuring common components for all wavelengths.
Conclusions:
- The developed CRDS gas sensor is effective for multiwavelength, multicomponent analysis.
- The system offers a practical solution for simultaneous gas detection in atmospheric air.
- Further insights into multiwavelength CRDS techniques are provided.
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