A novel Mach-Zehnder-interferometer (MZI)-based external cavity diode laser (ECDL) has been proposed and theoretically investigated in this study as a light source for tunable diode laser absorption spectroscopy (TDLAS). The proposed model can modulate the dual-arm optical path difference and the round-trip optical path length of the ECDL external cavity. The results demonstrate that the wavelengths of a certain MZI pass band center and the ECDL external cavity longitudinal mode may track each other over a significant range of voltage variation leading to mode-hop-free performance. Therefore, it can be used in the TDLAS system for gas detection and characterization and is expected to replace the DFB laser.
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