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