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Wavelength Meter Resolution vs Optical Spectral Resolution

When discussing the characteristics of the laser characterization tool, a really common confusion occurs between the terms “Optical Spectral Resolution” and “Wavelength Meter Resolution”. Indeed, both of these specifications contain the word “resolution” and are amongst the most common specifications of these characterization tools, but are referring to two widely different characteristics. The aim of this article is thus to well define both of the specifications and illustrate them by an example to avoid any mix up between the 2….