Results 1 to 5 of 5

Thread: Underwater Comms Laser - BBC News Item

  1. 09-08-2009, 03:36 #1
    Jem's Avatar
    Jem
    Jem is offline Senior Member
    Join Date
    Jan 2007
    Location
    Yorkshire, UK
    Posts
    4,585

    Default Underwater Comms Laser - BBC News Item

    http://news.bbc.co.uk/1/hi/technology/8243503.stm
    Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.”... Douglas Adams 1952 - 2001
    Reply With Quote Reply With Quote
  2. 09-08-2009, 08:55 #2
    Xytrell
    Xytrell is offline Senior Member
    Join Date
    May 2008
    Location
    Wisconsin
    Posts
    449

    Default

    Laser beams focus themselves when passing through water?
    Reply With Quote Reply With Quote
  3. 09-08-2009, 16:12 #3
    mixedgas's Avatar
    mixedgas
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    10,018

    Default

    Quote Originally Posted by Xytrell View Post
    Laser beams focus themselves when passing through water?

    Only if they are powerful, ultrafast, pulses at the right wavelengths.


    Steve
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...
    Reply With Quote Reply With Quote
  4. 09-09-2009, 10:31 #4
    Xytrell
    Xytrell is offline Senior Member
    Join Date
    May 2008
    Location
    Wisconsin
    Posts
    449

    Default

    What is the mechanism behind that?
    Reply With Quote Reply With Quote
  5. 09-09-2009, 16:39 #5
    mixedgas's Avatar
    mixedgas
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    10,018

    Default

    Quote Originally Posted by Xytrell View Post
    What is the mechanism behind that?
    Self Focusing. A nonlinear thing, and anything nonlinear needs high peak powers to work.



    Steve
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules