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I cannot pass the Ishihara test for blue/green to save my life... however, I can easily see the difference between 445, 470, and 525.

The search function on this site is practically useless. If, however, you use a google search it will often direct you to the appropriate LPF threads.

Damn... now I want one! Congratulations.

For just a circle, a mirror can be mounted on the tip of any small motor shaft... perpendicular to the shaft. See "The Laser Cookbook" by Gordon McComb.

I don't think anyone mentioned that to get a "beam" out of the diode, it must have an appropriate lens.

The rectangular shape is the normal propagation of a single diode emitter. Research fast and slow axis.

Too bad. Those OPSL lasers were great for holograms. Integraf has a low power red and I heard that Laserglow has some with long enough coherence length. https://www.integraf.com/shop/holography-laser You can usually find HeNes on e-bay... again much less power than that OPSL.

Check out this thread. https://laserpointerforums.com/threads/n2-pumped-dye-laser.105001/

What is the current to the tube? Even on standby or low power you should have around 4 amps. At full power maybe 8amps.

I do not have an answer for you. I own two similar lasers and I can tell you that the output on yours looks "jacked up". At that range, you should see a tiny dot on your card about 1-2mm diameter. I wonder if your tube is not lasing and you are just seeing the glow of the argon.

Have you tried adjusting the wavelength selector?

There is a huge variety of optical windows available. They can be expensive depending on which type you choose. Microscope slides are a dirt cheap alternative for situations where nit picky optics are not necessary.

check out the dye laser section on the "laser kids"website.

some of those cnc drivers have jumper pins to set output and then a pot for fine tuning.

Post you pictures on "IMGUR" then post links here.

Experience tells me that not all lasers are damaged by their own reflection. Over the years, I have constructed many non-diode type lasers. Most of them use HR/OC resonators. The first step in resonator alignment is bore sighting the alignment laser. The second step is to adjust the HR mirror to...

Just a thought... a convex lens on the sensor will allow for greater range and the use of lasers with larger beam diameters.

https://jtechphotonics.com/?product=900mw-405nm-laser-and-2-5amp-safety-compliant-driver-kit The rays of an expanded beam are more parallel allowing for sharper focus.

I do not have a specific answer to the actual question... however, a beam that is first expanded can be focused to a finer point.

You obviously have a conscience. The research needs people like you. I have said before that, as a rule, it is easier to destroy than create. Lasers are the exception to this rule. Lasers make exceptional tools but poor weapons. A great deal of mankind's benevolent technology started out as...