Diffraction Grating Wavelength Meter using a High resolution Webcam with Sub-gigahertz Sensitivity

Nowadays tunable lasers are widely used in various fields of science, for example, in laser cooling of atoms. Laser cooling is a technique based on the fact that particles change their momentum after re‑emitting photons which they have absorbed due to laser irradiation. In aforementioned technique it is crucial to use a beam tuned to a specific atomic transition. Also, analyzing atomic spectra requires the ability to measure a number of optical signals with close frequencies simultaneously, for instance, D1 and D2 transitions in ⁶Li atoms have frequencies differing by 10 GHz while having wavelength around 670 nm (relative difference ~2 ^. 10^-5). Objective of this work is to construct a wavelength meter having properties mentioned above.