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Intracavity Laser Absorption Spectroscopy Using Quantum Cascade Laser And Fabry-Perot Interferometer, Gautam Medhi
Intracavity Laser Absorption Spectroscopy Using Quantum Cascade Laser And Fabry-Perot Interferometer, Gautam Medhi
Electronic Theses and Dissertations
Intracavity Laser Absorption Spectroscopy (ICLAS) at IR wavelengths offers an opportunity for spectral sensing of low vapor pressure compounds. We report here an ICLAS system design based on a quantum cascade laser (QCL) at THz (69.9 m) and IR wavelengths (9.38 and 8.1 m) with an open external cavity. The sensitivity of such a system is potentially very high due to extraordinarily long effective optical paths that can be achieved in an active cavity. Sensitivity estimation by numerical solution of the laser rate equations for the THz QCL ICLAS system is determined. Experimental development of the external cavity QCL is …