Sodium Spectrograph

This is a spectrograph capable of resolving the sodium D-lines. A spectrograph differs from a spectrometer in that it literally takes a photograph of a spectrum. Analysis through software packages like imageJ (it's free and easily findable with a google search) allows users to create an instrument intensity vs. wavelength graph like a spectrometer.

This is a design that was used in a upcoming American Journal of Physics article (to be officially published ~ March/April of 2024). This design specifically requires the following additional pieces: a diffraction grating (we used an Edmunds Optics 32-215 reflection grating ~ $131), a lens (Thorlabs AC050-0150-A achromat doublet lens ~ $52), and a webcam (Logitech C310 ~ $27). These parts could be exchanged with similar items, but it could necessitate design changes.

In the pictures, there are example spectra (attained with this device) and detailed assembly instructions. Below, I will describe how to calibrate the "pixel axis"