![M2 factor, explained by RP Photonics Encyclopedia; laser beam, quality factor, beam divergence, caustic, ISO Standard 11146 M2 factor, explained by RP Photonics Encyclopedia; laser beam, quality factor, beam divergence, caustic, ISO Standard 11146](https://www.rp-photonics.com/previews/m2_factor.png)
M2 factor, explained by RP Photonics Encyclopedia; laser beam, quality factor, beam divergence, caustic, ISO Standard 11146
![optics - How to calculate loss due to Gaussian beam divergence of a laser going through multiple lenses? - Physics Stack Exchange optics - How to calculate loss due to Gaussian beam divergence of a laser going through multiple lenses? - Physics Stack Exchange](https://i.stack.imgur.com/hCE7I.jpg)
optics - How to calculate loss due to Gaussian beam divergence of a laser going through multiple lenses? - Physics Stack Exchange
![optics - How can beam divergence be corrected for in a $\rm CO_2$ laser cutter? - Physics Stack Exchange optics - How can beam divergence be corrected for in a $\rm CO_2$ laser cutter? - Physics Stack Exchange](https://i.stack.imgur.com/12aGb.png)