Lasers can do some amazing things. They are being used today to read DVDs, correct blurry vision and even for destroying Imperial Star Cruisers. Now you can add this to the list, “replacing car headlamps.” That’s right; vehicle headlights are getting the laser treatment.
BMW, one of the first automakers to adopt the technology, says that lasers have an illuminating power 1,000 times more powerful than LEDs — which up until just recently provided the greatest wow factor of all the bulb technologies out there. BMW explains that the technology has some compelling advantages, for example: laser automobile lights can be much smaller than conventional lighting systems, they can use less energy to operate, and they look pretty darn cool, too.
But wait a minute, can’t lasers burn your eyes out? Not a problem says BMW, because of the way the beam energy is directed, then reflected, then ultimately displayed out of the headlight housing, you can’t accidentally injure your eyes. This is not like “looking into a laser”. What happens with each headlight is that three blue lasers positioned at the rear of the assembly fire onto a set of mirrors closer to the front. Those mirrors focus the laser energy into a lens filled with yellow phosphorus. The yellow phosphorus, when excited by the blue laser, emits an intense white light. That white light shines backward, onto a reflector then the reflector bounces the more diffused white light forward to illuminate the road.
Because laser-powered headlight systems can be much smaller, automotive designers can have a lot more flexibility to make more aerodynamic shapes or fit more stuff into the engine compartment with the freed-up space.
BMW, the developer and so far frontrunner on this technology, hasn’t yet said when laser-powered headlights will be a regular option on its production cars and SUVs. And other companies? Given the “arms-race” nature of the auto business, it’s probably a safe bet that other manufacturers are already trying to figure out how to produce their own laser-augmented lighting systems. We will likely be seeing a great deal more about automotive laser illumination systems in coming years.
Source: Crosstown Chrysler Dodge Jeep Ram
Laser light is the successor of the successful LED headlights. BMW is developing a new laser headlights, which will be more efficient and effective.