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.
This paper firstly gives a detailed description of the equivalent iterative method and the transfer matrix method for calculating the transmittance of a multi-layer membrane structure, and then uses these two methods to simulate the transmittance characteristics of a single cavity all-dielectric thin film Fabry-Perot filter. By comparison, the equivalent iterative method can generate a similar distribution of optical intensity transmittance for TE and TM plane waves with that for the transfer matrix method. The optical intensity transmittance for the equivalent iterative method is just a little lower than that for the transfer matrix method. Besides, for either the TE or the TM plane wave, the distributions of phase variation between the two methods are different.
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