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A simplified trace gas detector using a multi-mode Fabry-Perot diode laser and cavity enhanced absorption spectroscopy has been developed and used to detect NO2 at the 100 ppt level.
A simple and compact method of generating modulated beating signals from a dual-mode laser via bias modulation of integrated micro-heaters is proposed and successfully demonstrated. The proposed scheme will enrich the continuous-wave terahertz system applications.
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