From what I've seen, green lasers usually have small beam diameters and low divergence (such as 1.4 mm at 0.9 mrad). However, I've noticed that many high-powered red lasers have much larger diameters and higher divergence (for instance, 4 mm at 2 mrad). I do know that lasers with longer wavelengths will have higher divergence, but according to the calculator I used, the difference shouldn't be that large.
On the other hand, I've also seen companies (such as this one) that claim to sell red lasers with much better specs (1.1 mm at 1 mrad). Does anyone know if they're telling the truth or not?
On the other hand, I've also seen companies (such as this one) that claim to sell red lasers with much better specs (1.1 mm at 1 mrad). Does anyone know if they're telling the truth or not?