David H Haffner SrReplaced the 4.7G DVD piece I was using for the diffraction grating, and replaced it with an 8.5G one. Now I have a ruling density of 0.36mm, which now gives me a wavelength range of 360nm (0.36mm *1000 = 360nm) and 2770 lines per mm, for a spectral resolution of 0.18nm, using my 150mW laser's FWHM as my measurement:
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