Optical Position Sensor for the VWS.

Starting Zemax Simulations

Jose Luis SirventSupervisor: Jonathan Emery

Student Meeting24 October 2011

1. Status

2. Contact with companies

3. Simulations with zemax

4. Comparation

Index

A) Initial analysis and new approaches

B) Search of new components◦ Collimators (4) , Focusers (2)◦ Circulators (5), cables, adaptators

1. Status

`Feedthrough

ROTATING

Disk with

reflective patern

(50um)

50 um

Focal Lengh

`

SMA905

Connector

Collimating

LensFocusing

Lens

C) Initial Estimations of losses◦ Study of possible limiting effects

Fresnel, Franhouer diffraction Interferences Fresnel reflection Light Coupling efficiency Estimate maximal separations

◦ Initial comparations in terms of power coupling

1. Status

LOSSES (Lc) Transmission Reflection Reflection (Collimator)Fresnell Disk-Vacuum 0.315283993 0 0.630567985dBFresnell Fiber-Vacuum 0 0 0dBInsertion Losses ST 0.35 1.4 2.1 2.1dBInsertion Losses SMA 1*2 2 2 2dBOptical Fiber 1.75 1.75 1.75dB

Free Space 28.3017246927.769080

3 5.953030906dBSplitter 10/90 0 2.2 2.2dB

Total Losses 33.7670086933.619080

3 12.43359889dBPr 0.04% 0.04% 5.71%Ps 50

065

080

095

011

0012

5014

0015

5017

0018

5020

0021

5023

0024

500

5

10

15

20

25

30

35

40

Distance Fiber-Disk VS Losses in Free Space (Transmission and Reflec-tion)

Transmission

Reflection

Reflection (Collimator)

Fre

e S

pace

Loss

es

(dB

)

A) Meeting with VaqTec◦ Fibers for Vacuum◦ Custom Lenses?◦ Aligners XYZ and angular

B) Contact with AccuGlass◦ Lenses & Collimators for Vacuum

Characteristics and models◦ Fibers for Vacuum◦ Feedthroughs

2. Contact with companies

Lensed fibers:◦ http://www.laseoptics.com ◦ http://www.corning.com

  Vacuum Optical Components:

◦ http://www.plasus.de/index.php?page=system_optikkomponenten&lang=en   Others Factories:

◦ http://www.thorlabs.de ◦ http://www.vacom.de/◦ http://www.newport.com ◦ http://www.hellma-analytics.com ◦ http://www.accuglassproducts.com◦ http://www.edmundoptics.com/ ◦ http://www.multimodefo.com◦ http://www.oceanoptics.com ◦ http://www.horiba.com◦ http://slwti.com/ ◦ http://www.ofr.com◦ Http://www.agiltron.com◦ Http://www.fiberw.com◦ Http://www.dpmphotonics.com◦ Http://www.acphotonics.com◦ http://www.lasercomponents.com

2. Contact with companies

1. Intro:

◦ Optical simulation software package.

◦ Simulation under geometric and physic optics approach.

◦ Simulation of fiber coupling efficiency.

◦ Interferences and diffractions

◦ Lens modeling and validation.

3. Zemax

3.1 Initial simulations:◦ 3.1.1 Transmission approach

Coupling efficiency: 0.15%

Distance limit: 1.5 mm < Fresnell distance Coupling 0.08%

3.Zemax

3.1 Initial simulations:◦ 3.1.2 Reflection approach

Coupling efficency: 0.27%

Distance limit: 2mm < Fresnell distance Coupling 0.08%

3.Zemax

3.1 Initial simulations◦ 3.2.3 Double Pattern approach

Wavelenth: 850nm & 1550nm Disks Thickness: 1mm Pattern used: 50um (Both positions On & Off) Distance Between Disks: Variable Screen distance: 1mm

3.Zemax

3.1 Initial simulations◦ 3.2.3 Double Pattern

approach:

In account 2 conditions A) Transmission B) Reflection

(Perfect reflection)

3.Zemax

3.1 Initial simulations◦ 3.2.3 Double Pattern approach (Transmission)

3.Zemax

3.1 Initial simulations◦ 3.2.3 Double Pattern approach (Reflection)

3.Zemax

3.1 Initial simulations◦ 3.2.3 Double Pattern approach

Transmission 850nm (Absorption 92%)

Reflection 850nm (Reflexivity 60%)

3.Zemax

3.2.4. Focusing the beam◦ Initial results with lenses.

◦ A) Usage of Double Convex lenses: Edmund Optics has Possible Lenses which could

fit in Accu-Glass Collimator. Initial Simulations are showing errors in focusing

distances.

◦ B) Usage of plano-convex lens combination: Two collimators from Accu-Glass faced Necessity of cutting one of them

◦ C) Using Defocusing defect: Accu-Glass Collimator as a Focuser

3. Zemax

LOSSES (Lc) Transmission Reflection Reflection (Collimator)

Fresnell Disk-Vacuum 0.315283993 0 0.630567985 dB

Fresnell Fiber-Vacuum 0 0 0 dB

Insertion Losses ST 0.35 1.4 2.1 2.1 dB

Insertion Losses SMA 1*2 2 2 2 dB

Optical Fiber 1.75 1.75 1.75 dB

Free Space 28.30172469 27.7690803 5.953030906 dB

Splitter 10/90 0 2.2 2.2 dB

Total Losses 33.76700869 33.6190803 12.43359889 dB

Pr 0.04% 0.04% 5.71% Ps

Power Balance Transmission Reflexion Reflection (Collimator)

Ps 5 5 5 mW

6.989700043 6.98970004 6.989700043 dBm

Pr 0.002100241 0.00217301 0.285502631 mW

-26.77730864 -26.62938 -5.443898848 dBm

4. Comparation with initial calculus.

Free space loses comparing initial with Zemax (dB) Transmission Reflection Double patternInitial 28.3 27.7 5.9Zemax 28.2 27.9 5.68