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semiconductor laser headlights

Discussion in 'Technical' started by doug, Oct 14, 2011.

  1. doug

    doug Administrator / Head Moderator

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    There have been articles bouncing around about this for a while, but none had any useful details. This one finally has some actual photos, so it's possible to have an idea of what's going on.

    First look at BMW's new laser headlights

    Looks like there are three wide-bandgap gallium nitride based blue lasers which are directed at a white phosphor. That luminescence is then roughly collimated with a lens and focusing mirror set to produce the headlight... err... light. This system doesn't look nearly as compact as some articles had been describing, but with the claimed efficiency gains, it's probably worth it. Plus it's a car with frickin' laser beams.

    [​IMG]
    [​IMG]
    [​IMG]

     
  2. TEG

    TEG TMC Moderator

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    #2 TEG, Oct 14, 2011
    Last edited by a moderator: Mar 13, 2016
    You have a switch with 3 settings - low beams, high beams, and blind all other drivers... :tongue:
    (sorry, couldn't resist...)

     
  3. Doug_G

    Doug_G Lead Moderator

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    You forgot vaporize.
     
  4. widodh

    widodh Model S R231 EU

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    In some occasions, like traffic jams the vaporize option could come in quite handy!
     
  5. TEG

    TEG TMC Moderator

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    Use of the vaporize mode is discouraged as it uses a substantial amount of power.
    Your driving range may be reduced if you use it frequently.
    Note, vaporize mode is only available on cars with the 300 mile pack due to power requirements.
    :redface::tongue:
     
  6. EV_de

    EV_de Model SP10/XP9 EU ZOE#47

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    ... therefor it should be limited to 2.5 vaporisations per mile ! :rolleyes:
     
  7. VolkerP

    VolkerP EU Model S P-37

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    the vaporize option is mandatory for all cars where the pedestrian warning signal is not working
     
  8. zack

    zack Member

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    #8 zack, Oct 14, 2011
    Last edited by a moderator: Mar 13, 2016
    Friggin' laser beams!

    [/QUOTE]
     
  9. SByer

    SByer '08 #383

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    I'll have to bug Professor Byer about that this weekend.

    I can imaging the required federal safety sticker on the lower front bumper: 'Do not stare at the car with one remaning good eye.'
     
  10. doug

    doug Administrator / Head Moderator

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    You know Bob Byer?? Any relation? I took his class some years ago.

    I'd think once the lasers hit the phosphor, the coherence is lost. Also after that mirror the beam is fairly large. Just as long as there aren't any stray specular reflections from the emitters, it's probably ok.
     
  11. TEG

    TEG TMC Moderator

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    df970626.jpg
     
  12. Doug_G

    Doug_G Lead Moderator

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    A friend of mine, who works with lasers, has a sign just like this in his lab:

    attachment.php?attachmentid=3122&d=1318647270.gif
     

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  13. SByer

    SByer '08 #383

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    Oh, I'm so ROFLMAO. I know I'm an under-sharer, but, uhm, yeah, I know him more commonly as 'dad'.
     
  14. jcstp

    jcstp Active Member

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  15. doug

    doug Administrator / Head Moderator

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    I should have guessed. =)
     

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