Below is the formula for solving spectral resolution (bandwidth,) I am using a 0.12mm acetate film slit, if I used the theoretical side of this equation I could input the slit with and I would get a theoretical FWHM of 2.87nm (1 x 0.12mm x 1540 = 184.2 wavelength = 532nm/184.2 = 2.87,) but the more practical application is to use the actual laser line itself.

So here I have a spectral bandwidth of 0.15nm which is 99.5 percent close to industry standard.

Front view of my prototype 1 (a) with M2 mounting holes cut in front of the cuvette holder for a fiber optic coupler.

Below are some design mods that I need to make, they didn't interfere with operation in anyway but were a result of the 3D printing process that I'll have to keep in mind the next time. (1) the silver mirror is 3.2mm thick, the final product came out about 1.5mm too large, so I will have to compensate the next time. (2) I have to raise the camera mounting block by 10.38mm, (3) expand the 38mm focal lens holder base by 5mm square.

Next pic, (1) 25mm filter slot on camera mount came out perfect, (2) had to redesign the DVD diffraction piece and lay it flat on top of the filter and secure it in place with a locking sleeve. (3) 32mm focusing lens assembly came out fine, except for the 25mm rear filter slot, I will have to expand the diameter a bit more.

So I can't use the Longpass edge filter yet.

A closer look at the detector set up.

All in all, the first initial testing exceeded my expectations. This prototype will be the prelude to the final product, as my goal is to design this set up as a one shot assembly, pre-drilled holes (well, 3D printed ones,) for the enclosure and components, and easy interlocking 3D printed parts, with a tolerance matching that of industry standards.