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You might have noticed the green beam is focused to a few inches. I wonder how bright the spot would appear if collimated for low divergence?

Cool and frightening at the same time.

It's unknown even to the experts. Read the link in the article if you have not.

See here. https://laserpointerforums.com/threads/hacking-with-a-laser.105807/

A physicist at the University of California, Riverside, has performed calculations showing hollow spherical bubbles filled with a gas of positronium atoms are stable in liquid helium. https://m.phys.org/news/2019-12-gamma-ray-laser-closer-reality.htm

That's interesting. Intuition leads me to suspect the beam would fade, not apparently stop as you describe when viewed orthogonal to the beam. So much for my intuition.

What he's describing is the apparent termination whether it's pointed skyward or at some distance as he did were the beam is not stopped by an object as stated in his post. In either the apparent termination is caused by not enough light reflected back to the point of origin.

Yes.

I believe the answer is simply there was not back scattering light to the point on origin. It you were to illuminate a white or light colored surface at the same distance that illusion would disappear.

I was keeping simple. The goal of the OP is to reduce the length (bar shape) to something more dot like. Go read his 1st post (again). I originally wrote the easiest way would be to slow the slow axis. In slightly more technical terms to decrease the divergence of the slow axis creating a...

You win.

From the article. Typically diode lasers are mounted is such a way as to create a horizontal stripe. Therefore the fast (short) axis is vertical.

I see we're not quite on the same page. The fast axis is vertical.... The reason I suggested slowing the slow axis was to square up the beam only (with no implication to make a beam expander). If not, the rectangular or bar shaped beam profile (spot) is maintained and gets bigger with...

A very short video.

To be certain we are on the same page here are two questions. Which is the fast axis? Which is the slow axis? Some more. Why would the slow axis not be longer in the far field? Are you certain you would use two lenses two expand the fast axis?

A diode laser has two axis; a slow and fast. It is rectangular in shape. The slow axis is longer. The simplest solution is to slow the slow axis of the beam with one cylindrical lens. Doing so will create a square or nearly square beam shape which at great distance will look spotlike.

Shining lasers at voice assistants like Alexa and Siri, researchers from Michigan and Japan achieved a hack where lasers had the power of commands from the human voice. https://m.techxplore.com/news/2019-11-thief-garage-door.html I'm going to annoy my co-workers, neighbors and such.

These look vaguely familiar. Something similar to a rod lens which it's not. It reminds me of a long length pcx lens. It may be a custom lens. Stop by Edmund Optics always a good place for info.

Obstreperous. Wow! That's the biggest word I've ever seen used on this forum.

I'd contact the company for a refund because they sent you the wrong laser. See here The HLONS (HMMWV Laser Ordnance Neutralization System), commonly known as ZEUS, is a solid-state laser weapon which is used by the U.S. military in order to neutralize surface land mines and unexploded...