Feeds

Boffins develop liquid crystal solid-state raygun turret

Points laser beam with no need to shift laser

Intelligent flash storage arrays

OK, so you've done it. You've finally built a high-energy laser which can put out a megawatt-range beam, and it doesn't emit toxic corrosive exhaust or melt itself in operation or weigh a prohibitive amount. Now to revolutionise warfare, right?

Well, just hold on there my crazy boffin friend: it's no good trying to hold the world to ransom just yet. If you want to employ your brilliant new raygun in the most popular applications – shooting down fast-moving cannon shells or nuclear missiles in mid-air, for instance – you will need to be able to point the beam easily and quickly. Simply pointing the whole laser is unlikely to be practical: and directing a superpowered raygun beam using conventional optics such as mirrors or lenses is likely to be troublesome as even the tiniest inefficiencies could divert enough energy to make your apparatus explode.

Enter Jihwan Kim and Michael Escuti, engineering brainboxes at North Carolina State University in the USA. They say they've hit upon a means of pointing laser beams using a stack of "polarisation gratings" – liquid-crystal patterns on glass plates. These can direct even a powerful war-grade ray without getting melted themselves, apparently.

"Because each individual grating is very good at redirecting light in the desired directions with almost no absorption, the stack of gratings do not significantly weaken the laser power," says Escuti.

The doc and his colleagues write:

The device shows high optical throughput (78% −83%) that can be substantially improved by optimizing substrates and electrode materials.

The gratings are solid-state and made using normal liquid-crystal industrial methods, too, so they should be reliable, very quick-acting and low cost – just the thing for holding a powerful beam on a speeding nuclear missile (or more realistically a falling Katyusha rocket; or more realistically still holding a less powerful ray on a moving communications reception apparatus).

Though it would seem likely that the liquid-crystal beam pointer kit will actually see its first applications in such fields as sensors and comms rather than blaster cannons, it does seem promising for weapons also. The US Navy's plans for a future fleet of raygun dreadnoughts may have moved a small step further forward: and so perhaps has the glorious day of the shark-portable, hat-mounted directed energy weapon.

Kim, Escuti and their colleagues' paper Wide-angle, nonmechanical beam steering with high-throughput utilizing polarization gratings is to be published in the journal Applied Optics. Until then you can read it in PDF (12 pages/1.1MB) here. ®

Providing a secure and efficient Helpdesk

More from The Register

next story
GRAV WAVE DRAMA: 'Big Bang echo' may have been grit on the scanner – boffins
Exit Planet Dust on faster-than-light expansion of universe
SpaceX Dragon cargo truck flies 3D printer to ISS: Clawdown in 3, 2...
Craft berths at space station with supplies, experiments, toys
That glass of water you just drank? It was OLDER than the SUN
One MEELLION years older. Some of it anyway
NASA rover Curiosity drills HOLE in MARS 'GOLF COURSE'
Joins 'traffic light' and perfect stony sphere on the Red Planet
Mine Bitcoins with PENCIL and PAPER
Forget Sudoku, crunch SHA-256 algos
Big dinosaur wowed females with its ENORMOUS HOOTER
That's right, Doris, I've got biggest snout in the prehistoric world
Japanese volcano eruption reportedly leaves 31 people presumed dead
Hopes fade of finding survivors on Mount Ontake
Canberra drone team dances a samba in Outback Challenge
CSIRO's 'missing bushwalker' found and watered
prev story

Whitepapers

A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.