Are there even lasers in the large format (50cm+ x roll of paper) realm? I thought it was all ink plotters/printers, at least that's all I've seen in print shops or design places. A lack of lasers might contributes to the SEO spam for the odd terms.
There are digital presses in B2 size using dry toner indirect (“laser”), liquid toner indirect (also “laser”), and inkjet processes. They are available in both sheet-fed and web-fed (“rolls”) configuration. (B2 sheet is 514x728mm, ~20x29”, or think “home/small poster size”; it’s sometimes called “half sheet”)
I work in this space (as a consumer of this equipment); all opinions here are my own, not my employer’s. For that reason, I’m reluctant to link to any specific vendor products, but if you’re interested, googling/YouTubing “b2 digital press” will give you some cool “how it works” videos.
A3 lasers certainly exist. But A3 is not wide format.
I've never heard of a true wide format laser (A2 and larger), and I suspect the technology doesn't exist to make an affordable one. You'd need super-precise optics, an absolutely huge toner/fuser system, and a supply chain for all of the above.
And there would be limited sales. Wide format printers are used for high quality art/photo printing, signage and ads, and sometimes for fabric printing.
Lasers are optimised for office document printing. You don't often need an A2 or larger office document. And when you do - cartography and blueprints - you're probably going to use a plotter.
Maybe `a3 laser` or `wide format laser` ?