According to one of our respected forum members, GooeyGus, they do not:
Questions: Is this accurate? Would it be as effective as a conventional IR filter (for a green)? I was under the impression that both greens and blues had a 2.5W pump diode, so how can blue be dealing with more pump power?Every viasho hand held laser or RPL that I have seen does not have an IR filter, per se. That being said, the cavity and optics are designed such that no stray IR really has any way out. With blue you are dealing with quite a bit more pump power, so it is possble for a tiny bit to escape even with the good cavity design.