Pulsed energy projectile
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Pulsed energy projectile or PEP is a technology of non-lethal weaponry currently under development by the U.S. military. It involves the emission of an invisible laser pulse which, upon contact with the target, ablates the surface and creates a small amount of exploding plasma. This produces a pressure wave that stuns the target and knocks him off his feet, and electromagnetic radiation that affects nerve cells causing a painful sensation. The technology can also be used as a lethal weapon, and indeed an early name was pulsed impulsive kill laser.
The pulsed energy projectile is intended for riot control and is said to work over distances of up to 2 km. It weighs about 230 kg and will probably be mounted on vehicles. The weight could become lighter as laser production technology improves.
The system was developed by Mission Research Corporation (now owned by Orbital ATK). It uses a chemical deuterium fluoride laser device producing infrared laser pulses. The plasma (produced by the early part of the pulse) explodes because its electrons absorb the energy of the later part of the pulse.
In 2003, a US military review reported that the electromagnetic radiation produced by PEPs had been shown to cause pain and temporary paralysis in animal experiments.
United States Special Operations Command FY 2010 plans included starting developmental work on a Counter UAV Pulsed Energy Projectile.
The PEP started a lot of controversy when it appeared that a team under the leadership of Brian Cooper was assigned to work on the pain factor of the weapon. It was discovered that the PEP could, additionally to the high pain it could already induce, with some tweaking, induce cold burn feelings and other forms of painfull sensations. The controversy and the fear of the public opinion to see it turned into a torture tool that woulden't leave any physical evidence on the victim ended the official program, Though Brian Cooper kept on studying effects of laser-generated plasma pulse on pain receptors and published a paper in 2008 called "Frequency Dependent Interaction of Ultrashort E-Fields with Nociceptor Membranes and Proteins."  .
- globalsecurity.org - Pulsed Energy Projectile (PEP)
- New Scientist - Maximum pain is aim of new US weapon, 2 March 2005
- Andrew Buncombe. Pentagon attacked for `Pulse' gun that inflicts long-distance pain. The Independent, 5 March 2005
- Military contract for PEP pain study, from thememoryhole.org
- John B. Alexander. Non-Lethal Weapons to Gain Relevancy in Future Conflicts. National Defense. March 2002
- Presentation on PIKL, by Harry Moore, 29 August 2000