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MPJA has 5 pack for 3 bucks "<5mW" https://www.mpja.com/Pack-of-5-Mini-LASER-Head-635nm-605mw/productinfo/19566+LZ/

The yellow goes with the black to 12v-, red 12v+. About 1 amp supply.

Tae Kwon Do master, 8th dan.

I thought that drivers that accept a PWM signal use it to adjust power level. The intensity of a continuous beam is varied but the laser does not "blink" on and off. Could be wrong.

Red mentioned curing the blind. We already have electronic eyes that allow the blind to see, after a fashion. In time, the electronic eyes will see better than natural eyes. At that point in time, wouldn't it be cruel to force a new born baby to live with crappy, natural eyes? Eyes are just one...

Can we all agree to call that color indigo?

I generally mind my own business in this group, but I have to say something. The VR goggles are a legitimate safety solution for viewing high power beams. As for Amak, suggesting unsafe practices in this community will likely get you banned.

Home built Scientific American argon laser.

Did anyone mention coherence length for laser in an interferometer?

For basic electronics I love Forest Mims Engineering Mini Notes. There are several in the series.

For glass work contact Eagle Laboratory Glass in Painesville, Ohio. They do extremely high quality work for very reasonable prices. https://www.eaglelabglass.com/ Yvonne Drake is the owner and made my laser tubes. Not only will they be perfectly formed and aligned, but they will also be annealed...

I have built the Sci Am argon, dye, and N2. If you search Sam's Laser FAQ there you will find my report: Anthony's Argon. If you do some digging, all of the articles in the book can be found in Sci Am archives from their original magazine publication dates. I did find a copy of the book on...

Just spit-balling. For something professional, I would look into Conflat fittings or similar. For home made, I have had good luck on pressure and vacuum projects using brass plumbing compression fittings... replace the copper ferrule with o-rings to sandwich the lens.

That lens is not the same thread size as 303etc. It is, however, the same thread size as g2, g8, 3E and others. That looks like a standared 12mm module that will fit a variety of hosts. As for 1/8" at 20' that may be a tall order. Perhaps someone else has some ideas.

The first laser project I ever did 40 years ago was a similar HeNe in pistol configuration that fit inside a 1&1/2" pvc pipe. With modern batteries the project would be much easier today.

I am also in Ohio (Port Clinton). I have several power meters. Let me know if I can help.

laser level from Home Depot?

A little over voltage does not hurt. It is just gets hotter. 12v may be a bit much. I have never tried a LM338 but is seems plausible. I know the LM317 does a good job for diodes rated for less than 1A. I would not hesitate to try a 338. Just test it with scope and "dummy load". As for a pot...

Brown is a combination of primary colors. Maybe with a RGBY.

The hardware you have selected is fine except as Shmackitup mentioned about focus lens. A 9v battery will not work. They can't supply adequate amperage. I strongly suggest spending the extra money for a real laser diode driver and use 2 lithium batteries in series (18650). I would pull fan power...