Could we one day control the path of lightning?

June 19, 2015
Could we one day control the path of lightning?

Lightning dart across the sky in a flash. And even though we can use lightning rods to increase the probability of it striking at a specific location, its exact path remains unpredictable. At a smaller scale, discharges between two electrodes behave in the same manner, streaking through space to create electric arcs where only the start and end points are fixed. How then can we control the current so that it follows a predetermined path? Professor Roberto Morandotti and his colleagues have discovered a way to guide electric discharges—and even steer them around obstacles—through the clever use of lasers. This scientific breakthrough was published on June 19, 2015, in Science Advances, the new open-access journal from the prestigious editors of the international journal Science.

Using the Advanced Laser Light Source (ALLS) facility, researchers from the INRS Énergie Matériaux Télécommunications research centre tackled this challenge, which had previously been the subject of intensive research, particularly in the 1970s.

Electric arcs have long been used in such technologies as combustion engines, pollution control applications, lighting, machining and micromachining. Potential applications could multiply with the ability to precisely control the path they take. A first step in this direction has been made and research into the new possibilities and parameters for guiding electric arcs promises to spark researchers' creativity.

Recent scientific and technical advances, as well as the ingenuity of Professor Morandotti's team (particularly researcher Matteo Clerici, a postdoctoral fellow with the research group at the time of the experiments), set the stage for this spectacular demonstration, where we see an follow a smooth path along a straight or parabolic trajectory.

Experimental figures show how different shaped lasers give discharges distinct properties and trajectories. By combining beams, it is even possible to achieve an S-shaped trajectory, with all other kinds of trajectory achievable in principle.

In his bold quest for knowledge, Professor Morandotti wanted to determine whether the self-healing properties of certain shapes of laser beams (such as Airy and Bessel beams) could be put to use in these new experiments. This attribute means that a laser beam whose intensity peak is blocked by an obstacle can reconstruct itself once past the object. Professor Morandotti's team placed an object between the two electrodes and observed that the discharge leapt over the obstacle, without damaging it, and returned to its laser guide on the other side.

Different shapes of discharge achieved based on the type of beam used. A and B: Gaussian beam (control). C and D: Bessel beam. E and F: Airy beam. G and H: S-shaped beam obtained by combining two conventional Airy beams. Left: Photographs taken when no voltage is applied (only the laser beam is visible). Right: Discharge in the presence of high voltage between the two electrodes.

"Our fascination with lightning and electric arcs aside, this scientific discovery holds out significant potential and opens up new fields of research," said Yves Bégin, vice dean of research and academic affairs at INRS. "This spectacular proof of concept, which was conducted over a distance of a few centimetres, required the high-power lasers, state-of-the-art facilities, and extraordinary research environment that our professors helped to create at INRS. Being able to work in such cutting-edge labs enables our students and postdoctoral fellows to embark on the path of even while still in school."

Could we one day control the path of lightning?
A and B: Gaussian beam (control). C and D: Bessel beam. E and F: Airy beam. Left: Laser beam with no voltage applied in the presence of an obstacle. Right: For both the Bessel and Airy beams, the discharge follows the laser and circumvents the obstacle before reconstructing itself. The inset in D is a multishot photo of the various trajectories the discharge take around the obstacle before converging on a single rectilinear trajectory.

Explore further: INRS overcomes a hurdle in the development of terahertz lasers

More information: Laser-assisted guiding of electric discharges around objects, Science Advances, advances.sciencemag.org/content/1/5/e1400111

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5 comments

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Graeme
not rated yet Jun 19, 2015
We need to have this with spark plugs to make the spark in an internal combustion engine travel out into the centre of the cylinder to get faster combustion.
katesisco
not rated yet Jun 20, 2015
Well, the laser-mirror alignment needs stable footing. That almost certainly has war applications.
swordsman
not rated yet Jun 20, 2015

By creating a plasma, there are moving electrical charges created through which the lightning can travel. This changes the air into a conductor, thus allowing a much greater distance through which the arc can travel. Excellent experiment, and one with much potential.
marko
not rated yet Jun 22, 2015
Could a laser induced electric arc be designed for generating a moveable airfoil profile which could be used as a wing or fan rotor.

It could completely replace a solid blade and be used for jet propulsion or helicopters.
antialias_physorg
5 / 5 (1) Jun 22, 2015
We need to have this with spark plugs to make the spark in an internal combustion engine travel out into the centre of the cylinder to get faster combustion

Google for "laser spark plug". If you can ignite the mix with a laser then there's no point in also having a spark plug.

Could a laser induced electric arc be designed for generating a moveable airfoil profile which could be used as a wing or fan rotor.

Note that the amount of power necessary for the laser is not negligible. I doubt this would be energy efficient. (And I can see any number of problems in conditions other than 'perfectly dry')

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