For my research, pretty much everyone uses a 520 nm green laser but I'm a bit confused at two things.
1. You mentioned you need several hundred mW, but the laser power recommended by Raman is typically 10 to 35 mW.
2. Also, a diode laser doesn't have that narrow linewidth that you need for...
I'm trying to build a DIY Raman spect connected to a compound light microscope (detailed in laserpointerforums.com/threads/raman-spectroscopy.102872/post-1534155) and I came across this laser:
ebay.com/itm/155196685156
Digging in deeper, it seems like this is the laser (spec sheet)...