The present disclosure provides a detector for a capnography device for uninterrupted monitoring of respiratory gasses of a subject, the detector includes a gas flow chamber, configured to permit flow of respiratory gasses between a first orifice and a second orifice thereof, a bandstructure cascade laser configured to provide mid-infrared wavelength laser radiation to the flow chamber, the mid-infrared wavelength laser radiation having wavelengths that at least partially correspond to an absorption spectrum of carbon-dioxide molecules, and a first radiation sensor configured to obtain mid-infrared wavelength radiation passing through the chamber and to provide a radiation intensity signal indicative of changes in carbon-dioxide level in respiratory gasses within the chamber during at least one respiration cycle.
