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Optical Ray -Tracing Coherent beam propagation in a Multi -Pass crystal

Optical Ray -Tracing Coherent beam propagation in a Multi -Pass crystal. By Andreas Walther and Atia Amari. Outline. Background What information can we get from Raytracing? Methods / Hands-on FRED experience Results. Quantum state storage project.

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Optical Ray -Tracing Coherent beam propagation in a Multi -Pass crystal

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  1. Optical Ray -TracingCoherent beam propagation in a Multi-Pass crystal By Andreas Walther and Atia Amari

  2. Outline • Background • What information can we get from Raytracing? • Methods / Hands-on FRED experience • Results

  3. Quantum state storage project The goal of the project is to demonstrate efficient storage and reconstruction of single-photon. The complete quantum field is stored To achieve this we may require that: --- High absorption ( a L >> 1 )

  4. To achieve sufficient absorption depth : • Waveguides - Crystalline fiber - Multi-pass configuration

  5. AR HR Electrodes Multipasscrystal

  6. What information can we get from Raytracing ? • Bulid crystal holder (how do we design it?) • Optimize the beam inside the crystal • - Constant beam waist • - Better accuracy on ray length • Study reflected beam overlap

  7. 3000 2500 2000 irradiance (arb. u.) 1500 1000 500 0 10 400 200 Reflective surface 9.5 0 9 -200 length (μm) distance from surface (mm) 8.5 -400 What information can we get from Raytracing ? Reflected beam overlap:

  8. Real part 40 20 amplitude (arb. u.) 0 -20 -40 -300 -200 -100 0 100 200 300 Imaginary part sum 40 Irradiance (sum squared) only incoming 2000 only reflected 20 sum 1500 only incoming amplitude (arb. u.) only reflected 0 irradiance (arb. u.) 1000 -20 500 -40 -300 -200 -100 0 100 200 300 0 -300 -200 -100 0 100 200 300 1500 1000 500 0 -300 -200 -100 0 100 200 300 What information can we get from Raytracing ? Coherent addition: Surface @ 9.6 mm length (μm) Surface @ 9.6 mm + λπ/2 length (μm) length (μm)

  9. Concluding remarks about FRED • Pros • Very easy to learn the basics, like creating objects • Broad range of tools/customization • Fast computation • Cons • Non-intuitive script language with no debugging tools • Documentation could be better • No compatability with other programs (like origin/matlab) But all in all, a very useful program, that actually gave us a lot of info

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