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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...

I have similar problems with G8. I do not know why it does not just come in a longer barrel.

18650batterystore is always my first stop for batteries. They are great, but lately their button top selection has been limited.

I tried to stay out of this one, but the last time I ordered from AixiZ I had very similar issues. After over a month I had to file a PayPal dispute to get a refund. I will not order from them again.

Glad to hear it. Next time you will be able to do it in 30 min.

This is both circuits combined. Everything left of LD+ and LD- is the test load, and everything to the right is the CC driver. The test load section shows where to attach a volt meter to read the current to the laser diode. On the driver section, "RES" and "POT" set the output current. Note it...

What results are you getting. Do the diodes light up at all. Are configured for CC mode on the 317s. What collimating optics? Test load?