Les Lab | INSIDE A LASER! An Open Cavity Helium-Neon Laser! @LesLaboratory | Uploaded 3 months ago | Updated 1 hour ago
Episode 64

#laser
#electronicscreators

Let's take a look at an awesome open resonator cavity He-Ne Laser!
Tweak-able and hackable, you could fit your entire body inside the Laser cavity!

I talk about the Brewster angle, and the technical specs of a NOS Brewster windowed Helium Neon Laser tube!

Optical contacting is discussed, that is used to bond glass parts with no glue, but creates a permanent bond.

I designed built a really cool mirror mount that can hold 6 Laser mirrors!

I show how to do Quick and Easy Laser alignment, and demonstrate Transverse Electromagnetic Modes (TEM), as well as extend the cavity to around two feet!

Brewster Laser tubes available from:
ebay.com/itm/303507585770

RP-Photonics Encyclopedia

rp-photonics.com/encyclopedia.html

Sam's Laser FAQ: Care and Feeding of the One-Brewster HeNe Laser Tube
repairfaq.org/sam/onebrewt.htm

Sam's Laser FAQ: Mirror Mounts
repairfaq.org/sam/laserclp.htm#clpmlm

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0:00 Intro
0:08 Laser tubes
1:04 Brewster Windows
1:38 Brewster Laser Tube
3:02 Optical Contacting
3:28 Mirrors
4:11 Tube mounting
5:02 Mirrors
5:33 An AWESOME mirror mount!
7:37 Tube lit
7:57 QUICK and EASY Laser Alignment
9:25 First Light!
9:55 Rotating the Mirrors!
10:39 The output beam, beautiful modes!
12:30 Half metre cavity!
13:00 Smoke test
13:19 Out