1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Lasers as an energy source

  1. Oct 4, 2013 #1
    if lasers produce so much power why can't we use it as an energy source
  2. jcsd
  3. Oct 4, 2013 #2
    Well to get a laser beam you have to supply energy right? If laser is used as an energy source you are getting nothing but the same energy you had supplied, practically lesser perhaps...
  4. Oct 4, 2013 #3


    User Avatar
    Gold Member
    2017 Award

    Here are schematics of three laser devices; red laser pointer, green laser pointer and a Helium–neon laser. Where are the energy sources (power supplies) in the pictures?


    Helium–neon laser:
    http://www.olympusconfocal.com/java/henelasers/henelasersfigure1.jpg [Broken]
    Last edited by a moderator: May 6, 2017
  5. Oct 4, 2013 #4
    some can produce terawatts of power so where do they get all that energy to feed into the laser
  6. Oct 4, 2013 #5


    User Avatar

    Staff: Mentor

    Power is not energy. Terawatt lasers produce very short pulses.

    As others have pointed out, lasers are not a source of energy. The consume more energy than what comes out in the form of light.
  7. Oct 4, 2013 #6


    User Avatar
    Gold Member
    2017 Award

    Last edited: Oct 4, 2013
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook