Tutorial: How to find focus of laser lens?? CO2 Laser Machine Focal Length - YouTube
![Laser beam focusing: regular (3 element lens) & G2 [short focal lens] - animated guide - YouTube](https://i.ytimg.com/vi/kD7rAxmKeVM/maxresdefault.jpg "Laser beam focusing: regular (3 element lens) & G2 [short focal lens] - animated guide - YouTube")
Laser beam focusing: regular (3 element lens) & G2 [short focal lens] - animated guide - YouTube
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