Or just get a laser thats not DPSS and dont worry about IR ever :thinking:
If you want a DPSS laser then get a quality on thats IR filtered and again, never worry about IR. Cheap lasers = junk (for the most part). Occassionally you will get a good cheap laser but if you search this forum, most people's cheap laser break within a few months, sometimes minutes of using. Spend the extra cash up front and save HUGE down the long run. Lasers are not cheap and if you think this is a cheap easy hobby then you are under the wrong assumption.
My MagLite laser cost over $320 to build.......and it was built by me (custom machine work by jayrob since i dont have a way of machining the needed parts) If you buy it off a member pre built then add in their profit.....lasers=EXPENSIVE