Teenagers are thought to be knocking-up the potentially deadly gadgets in minutes using parts found around the house.
A series of video tutorials explaining how to create them have racked up millions of hits on YouTube.
Yet doctors have warned the lasers – which are 1,000 times more powerful than the UK”s recommended safe limit – could blind Britons instantly.
Last night David Allamby, medical director at London”s Focus Clinic, called for a ban on the shocking videos.
He said: “If the laser from one of these homemade pens is shone in someone”s eye for just a split second, it could potentially blind them for life.
“The power generated would simply burn a hole in the retina causing irreparable damage.”
Around a dozen children are blinded or injured by laser pointers each year, according to to official figures.
And two British Airways planes have been targeted by the devices this month alone – sparking fears pilots could be blinded.
The most recent incident affected a service from Amsterdam to Heathrow just before 8pm on Monday.
Critics have called for a blanket import ban on the devices.
But some fear youngsters could get around any potential clamp-down by making their own laser pen.
Optical Physics Professor Mark Fox, from the University of Sheffield: “You can get all the bits very easily.
“You can buy them from Amazon, or they can be taken from a DVD or Blu-Ray player. It”d cost you 10 or 20 quid.”
Some of the lasers are blue or green but Professor Fox says the most dangerous ones are invisible to the human eye.
He said: “They”re dangerous because you wouldn”t know you were looking at it until you felt the burning in the eye.”
He added: “These lasers would easily set fire to wood or paper and burn through skin if you don”t flinch first.”