Laser weapons not feasible
Posted in Commentary on July 30th, 2008 by SachaJustin writes about a Wired article discussing counter-measures of laser weapons. He then complains about terrorism as being the cited reason for the development of such counter-measures.
While this is true, I have an even more blunt approach.
Laser weapons, at least for significant military applications (specifically, jets nailing each other out of the sky with lasers, not missiles, or jets taking out tanks on the ground with lasers) is not going to happen.
The simple reason is that lasers are too inefficient and you’d need an on-board nuclear reactor to send a beam of energy at the relevant distance. You’d also need to be able to focus this beam for a long enough period of time to cause thermal damage, which is not a trivial problem to solve when the originating source of the laser is a jet (on the ground you’ve got line-of-sight issues which makes lasers militarily impractical). Finally, the thermal damage that you are trying to inflict on your target is something that you’d also have to be solving yourself, mainly because when you’re pumping that much power, you are going to cause a lot of waste heat to be generated. A lot.
Militarily, there may be a use for lasers with electronic jamming, but you’re not going to see anything remotely resembling “Phasers” on Star Trek where you can blow things up and melt rocks with a hand-held device. There is too much waste heat generated at the generation source to make this feasible.
The wired article links to a video that shows missiles getting blown out of the sky with infrared lasers, but ultimately kinetic interceptors will be a much more realistic anti-missile defense than lasers will ever be.