Optical ray tracing coherent beam propagation in a multi pass crystal
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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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Optical ray tracing coherent beam propagation in a multi pass crystal

Optical Ray -TracingCoherent beam propagation in a Multi-Pass crystal

By

Andreas Walther and Atia Amari


Optical ray tracing coherent beam propagation in a multi pass crystal

Outline

  • Background

  • What information can we get from Raytracing?

  • Methods / Hands-on FRED experience

  • Results


Optical ray tracing coherent beam propagation in a multi pass crystal

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 )


Optical ray tracing coherent beam propagation in a multi pass crystal

To achieve sufficient absorption depth :

  • Waveguides

- Crystalline fiber

- Multi-pass configuration


Optical ray tracing coherent beam propagation in a multi pass crystal

AR

HR

Electrodes

Multipasscrystal


Optical ray tracing coherent beam propagation in a multi pass crystal

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


Optical ray tracing coherent beam propagation in a multi pass crystal

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:


Optical ray tracing coherent beam propagation in a multi pass crystal

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)


Optical ray tracing coherent beam propagation in a multi pass crystal

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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