U.S. Army weapon shoots lightning bolts down laser beams
By Darren Quick
01:20 June 28, 2012
A lightning bolt travels horizontally down a plasma channel from the LIPC before deviating when it gets close to the target which offers a lower-resistance path to the ground (Photo: U.S. Army)
Thought that title might get your attention, but shooting lightning bolts down laser beams is just what a device being developed at the Picatinny Arsenal military research facility in New Jersey is designed to do. Known as a Laser-Induced Plasma Channel, or LIPC, the device would fry targets that conduct electricity better that the air or ground that surrounds them by steering lightning bolts down a plasma pathway created by laser beams.
The pathway takes the form of an electrically conductive plasma channel that is formed when a laser beam of enough intensity (a 50 billion watt pulse lasting two-trillionths of a second will do) forms an electro-magnetic field strong enough to ionize the surrounding air to form plasma. Because the plasma channel conducts electricity much better than the non-ionized air that surrounds it, electrical energy will travel down the channel.
Then, when it hits its target an enemy vehicle, person or unexploded ordnance, for example the current will flow through the target as it follows the path of least resistance to the ground, potentially disabling the vehicle or person and detonating the ordnance. The lightning will also deviate from the channel when it gets close to the target and finds a lower-resistance path to the ground.
Thats the basic physics behind it, but overcoming the technical challenges to actually build the device wont be easy.
"If the light focuses in air, there is certainly the danger that it will focus in a glass lens, or in other parts of the laser amplifier system, destroying it," said George Fischer, lead scientist on the project. "We needed to lower the intensity in the optical amplifier and keep it low until we wanted the light to self-focus in air.
The research team also had to synchronize the laser with the high voltage and ruggedize the device so it could be operated under extreme environmental conditions. There is, of course, also the problem of providing enough power to operate the device for extended periods of time. Despite these challenges, the team claims to have made notable progress in recent months after reporting "excellent results" in tests conducted in January, 2012.
Work on the device is continuing.
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