First, there's no reason for a laser "beam" to show up like that unless it is traversing air that has smoke or other particulates. And even if it was, it would not be that uniform from top to bottom.
Second, the line itself shows regular quantizing "glitches" because the line is not at exactly 45 degrees, so the "draw a straight line" graphic editor had to adjust by one pixel every 25 or so pixels.
Just expand the photo and look at that line. It was obviously added later with a graphic editor.
So.... what else about the photo and/or the article was faked?
I can see the stairstep................
It is fascinating that so many announcements of coming weapons, from the smallest to enormously expensive fighters, bombers and Navy vessels, are promoted through what we used to commonly call "artists' renderings." It was always a sales pitch. Some of this stuff -- Russian, British, or US -- seems like more sales pitches.
If it works, put it into battle, without all the PR. It will prove itself there, not in the press releases. Best wishes.