Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Superposition of two E field

  1. Nov 1, 2008 #1

    cks

    User Avatar

    I want to superpose two laser beams to create the beat frequency.

    I design the system to be like this .

    Two laser beams come from A and B meet at the center of the PBS, so that two laser beams going out to C and D. I tune the laser beams A and B such that the laser output at C and D superimpose. In mathematical terms.

    E1=Aexp[i(k1x-w1t)]
    E2=Bexp{i(k2x-w2t)]

    So, the superimposed state is

    E=E1+E2.

    My problem is, I use a polarizing beam splitter. so the output laser beam have electric field that are orthogonal to each other. It'd be nice if I can get parallel E field so that the superposition would be much better.

    How can I do that. How can I make the two orthogonal electric field to be parallel to each other?
     

    Attached Files:

    Last edited: Nov 2, 2008
  2. jcsd
  3. Nov 2, 2008 #2

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Use a non-polarizing, 50/50 beam splitter. And adjust the beams so that they have the same polarization.
     
  4. Nov 3, 2008 #3

    cks

    User Avatar

    I have found the solutions.

    Just put a half-wave plate and a PBS after the PBS.
     
  5. Nov 3, 2008 #4

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    So the wave plate rotates the polarization to be at 45 degrees before going into the 2nd PBS? Nice.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Superposition of two E field
  1. Fields of Avionics (Replies: 4)

Loading...