4-Level Lasers

An explanation of why a four level laser can be more efficient than a three-level laser, by student Claire Lillington from the Department of Medical Physics and Bioengineering at University College London.

[@SchutzmarkeGMBH]

Thank you so much for this Video. Fast Explanation and exactly what I needed. THX

[@rlh7678]

This helped a ton! Thanks!! :)

[@akshayvarma3313]

awesome

[@RushSina]

Thank you!

[@joshuanock962]

great vid =D

[@mohammadhossein641]

Great