Sorry if this question has already been answered, if not:
These lasers are NOT IR filtered in the standard sense, however they do not leak IR in the same way cheap green laser pointers do. This is due to the construction of the modules which only allow IR to pass directly through the crystals. This means that the IR is contained entirely within the beam. In order to stay safe, you only need avoid direct exposure to the beam itself, which you should do anyway. If you measure the output of these modules on most power meters the reading will be for both green and IR output. I'm not sure about the ratio, but I believe that the green output is dominant. One person on this forum stated that after running the beam through a dichroic element to sparate the green from the IR they only lost 4mw of output. What this means is that only 4mw was IR, the rest green.
Placing the unit in a case with a small aperture (about 1/4") about 2-3" in fron of the collimating (output) lens will block a significant amount of the IR splatter generated by these modules, if you are concerned about it. As long as the IR splatter isn't collimated or coherent, there's not much to worry about.
The time to be concerned about IR is when it is not confined into the output beam (as often occurs with cheap green laser pointers). If stray IR is emitted from the output lens in any other fashion, you could get hit with a stray beam and not even know it until it's too late. This is due to the fact that IR is invisible, and will not provoke a blink reflex.
Also, yes, obtaining an IR blocking filter and placing it externally would be a simple fix if you are concerned about eliminating the IR. You will lose a small amount of total output power, but you would get an almost pure green output.
If you use these modules as they come, without IR filters installed, you may want to make sure your safety glasses are rated for BOTH 1064nm and 532nm.
Personally, I don't consider the IR emissions from these modules to be a huge problem, since they are well controlled and confined to the beam. This greatly reduces the danger involved, and for the price... why complain?
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