The short wavelengths can show Raman lines very nicely. Remember the bright PL emissions are always in the same wavelength range. This means short wavelength pumps give you the most clear Raman wave numbers when the shift is smaller and more near to the pump. Sometimes 785nm gives you <1% of the Raman excitation emissions of 405-375nm.Not a very good wavelength for raman as there is so much fluorescence I would think the raman would be swamped. I like 785nm. Maybe you have a specific application where it works.