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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 specification 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….


Units conversion for spectrum representation

Wavelength, Wavenumber, Frequency and Photon Energy Conversion                                    The x-axis of a spectrum should be scaled in frequencies (in Hertz). The frequency representation is dedicated to applications such as measurements of atomic and molecular transitions, heterodyne spectroscopy or TeraHertz generation. The optical frequencies are so large (from 400 to 750 TeraHertz in the visible range) that it is common to use wavelengths in micrometers…