https://physlab-wiki.com/ 2026-05-17T00:44:08+00:00 https://physlab-wiki.com/ https://physlab-wiki.com/lib/tpl/UChicago/images/favicon.ico text/html 2022-11-10T12:07:40+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/phylabs/lab_courses/supplemental-material/physics-and-mathematics-references/fringe_counting/start?rev=1668100060&do=diff Using an interferometer to calibrate the frequency of the laser Your absorption spectra will consist of photodiode voltage as a function of time as recorded by the digital scope. The vertical axis measures the intensity of the light passing through the vapor cell. As the piezo voltage varies linearly with time, and as the laser frequency varies with piezo voltage, we may convert the sweep times to changes in the frequency of the laser output. Ultimately what we want to measure are the energy $\…