Optimizing Superposition of Laser Beams Using Polarizing Beam Splitters

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Discussion Overview

The discussion revolves around the optimization of superposition of laser beams using polarizing beam splitters (PBS). Participants explore methods to achieve parallel electric fields from two orthogonally polarized laser beams to enhance superposition effects, particularly focusing on the use of optical components like half-wave plates and beam splitters.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant describes a system where two laser beams meet at a PBS, resulting in orthogonal electric fields, and seeks a method to achieve parallel fields for better superposition.
  • Another participant suggests using a non-polarizing, 50/50 beam splitter and adjusting the beams to have the same polarization.
  • A different participant proposes a solution involving a half-wave plate and a PBS after the initial PBS to achieve the desired polarization alignment.
  • There is a clarification about the function of the wave plate, indicating it rotates the polarization to 45 degrees before entering the second PBS.

Areas of Agreement / Disagreement

Participants present multiple approaches to the problem, with no consensus on a single solution. Various methods are proposed, and the discussion remains open to further exploration.

Contextual Notes

Assumptions about the initial polarization states of the laser beams and the specific configurations of the optical components are not fully detailed, which may affect the proposed solutions.

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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?
 

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Use a non-polarizing, 50/50 beam splitter. And adjust the beams so that they have the same polarization.
 
I have found the solutions.

Just put a half-wave plate and a PBS after the PBS.
 
So the wave plate rotates the polarization to be at 45 degrees before going into the 2nd PBS? Nice.
 

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