Hi,
Your question is very general and seems not to be elaborated
You should provide a datasheet of your device....or at least something similar...
And a draft on what you want to do.
Setting wavelength: I doubt there are "low cost lasers" wich wavelength can be adjusted. And why?
I recommend to read at least a bit of information about laser diodes and then look at some distributor's internet sites and look for laserdiodes. Farnell, digikey, mouser...
..just to get some clue about wavelength, light power, divergence angle, availability, price...
Klaus