#laser
#electronicscreators

What happens when you reflect a Laser beam back on itself?
This unusual Laser system from a Particle Counter does exactly that!
Why?
how does it work?
Let’s find out!

Sams Laser FAQ The PMS/REO External Resonator Particle Counter HeNe Laser
https://www.repairfaq.org/sam/laserhen.htm#henish7

External Passive Cavity Laser patent:
https://patents.google.com/patent/US4594715A/en

Previous teardown of the Laser Particle counter:
https://m.youtube.com/watch?voUM1OD_WWgM

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0:00 Intro
0:12 Helium Neon Lasers!
0:53 Brewster Window Laser
1:46 Unusual Particle Counter Laser
2:44 Sam’s Laser FAQ
4:02 Patent External Stabilized Passive Cavity
8:25 Laser Teardown
9:05 Optical Bench Setup
9:45 Laser Demo
12:43 Credits

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