Real thermonuclear fusion laser used in the movie 'Tron'. Inertial confinement research at Lawrence Livermore National Labs. |
Firouz: "My ! It certainly packs a powerful wallop doesn't it !" |
'Beam Rider', a laser powered launch vehicle on its maiden flight. |
Science Fact: The real 'Lightcraft', a laser propelled spacecraft was recently tested and reached an altitude of 30 meters. | |
The 50 cm wide beam from a 10 kw CO2 laser is focussed by a parabolic mirror at the base of the vehicle into a ring shaped plasma. Air at the focal point is heated to between 10,000 and 30,000 Kelvin at tens of atmospheres by kilojoule laser pulses lasting 30 microseconds and repeated 10 times per second. After each pulse the plasma expands and cools very rapidly producing thrust and a brief flash of visible light. Air flowing through the vehicle replenishes the supply of gas near the focal point. The aluminum craft is 15 cm in diameter, has a mass of 50 grams and is gyroscopically stabilized. |
The "Lightcraft" is designed at the
Rensselaer Polytechnic Institute
and launched at the
White Sands Missile Range
with a SDI laser which is normally used for testing ICBM components for
vulnerability to laser countermeasures from a strategic missile defence system.
It is the highest average power, pulsed carbon dioxide laser presently
operating in the U.S.
The team is planning to use a more powerful
150 kw CO2
laser in preparation for flights to the edge of space (100 km altitude).
Laser propulsion costs several orders of magnitude less
than chemical-fueled rockets. Near term applications include launching microsatellites.
There is another project called
WaveRider
which uses lasers to create shock waves by detonating the air
ahead of the ship as it ascends into orbit, this reduces the atmospheric drag.
A homebuilt laser is fired at an approaching spacecraft to assist in its propulsion. |
A powerful laser originaly designed to shoot down intercontinental ballistic missiles, used instead against escaping rebels. |