Green lasers: InfraRed filters
Why they are important-
What does a IR filter look like? Below is a picture of one. I have also included one where it is attached to a laser module.
You may be asking how a shoddy laser pointer can have a power of 200mW but be less bright than a 50mWlaser pointer. Here is the trick. As we just said, these laser pointers give out a lot of infrared light which you can't see making them less bright. Laser power meters however cannot distinguish between green light and infrared light. The 200mW power level of a shoddy laser pointer will normally be made up of mostly infrared light. For example a 200mW shoddy laser pointer is likely to have a combination 25mW green (532nm) and 175mW infrared (808nm). A 50mW laser pointer will be 50mW of green light with virtually no infrared light.
All genuine green laser pointers and portable lasers have infrared filters inside them that blocks infrared light. Shoddy laser pointers have had this filter removed. Without this filter, these laser pointers are very dangerous because the infrared light can damage your eyes and you would not even be aware of it until to late.
So if you have a high powered laser pointer that is not bright, it is most likely giving out lots of dangerous IR so please use it with extreme care, or even better, destroy it.
Genuine green laser link on ebay- Genuine Green lasers
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