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 FRED Coherence FRED : A software tool  FRED Coherence FRED : A software tool

FRED Coherence FRED : A software tool - PowerPoint Presentation

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Uploaded On 2020-04-03

FRED Coherence FRED : A software tool - PPT Presentation

for modern engineering FRED Overview What is FRED Comprehensive opto mechanical systems design analysis tool Stray light analysis scatter and ghosting Coherent beam propagation Imaging system design and photorealistic rendering ID: 775173

fred diffraction design source fred diffraction design source analysis field mode coherent laguerre scatter coherence systems virtual system multi

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Presentation Transcript

Slide1

FREDCoherence

FRED

: A software tool

for modern engineering

Slide2

FREDOverview

What is

FRED

?

Comprehensive

opto

-mechanical systems design analysis tool

Stray light analysis (scatter and ghosting)

Coherent beam propagation

Imaging system design and photo-realistic rendering

Virtual prototyping

Opto

-mechanical systems debugging (Forensic Optics)

Thermal self-emission analysis

Illumination design

Tolerancing

, fabrication and testing

Both sequential and non-sequential

raytracing

modes

Multi-variable optimization capability

Slide3

FREDOverview

What is FRED?FRED can be used in virtually every step of the design process.Initial proof of concept using catalog partsIntegration of optical and CAD designsFull analysis of a virtual prototype including scatter, coatings, dispersion, absorption, volume scatter, diffraction, thermal emission, source characteristics…Quickly manipulate model parameters for tolerance analysesIntegration with vendor catalogs for manufacturing or system debugging

Concept

Design

Analysis

Tolerancing

Manufacture

FRED

1

2

3

4

5

Slide4

FREDCapabilities

What are FRED’s Capabilities?

General complex field propagationDefault source typesPlane waves, spherical waves, Gaussian TEM00, Astigmatic GaussianCustom source typesGaussian (Hermite, Laguerre, Laguerre Cosine, Laguerre Sine), R^n, Amplitude/Phase mask, Lambertian, Inverse Lambertian, cos^n, sin^n, SampledField polarizationRay synthesis from arbitrary field dataSpatial resamplingDiffraction: Aperture, edge, slit, etc.Multi-mode beam simulationBirefringenceInterferometryLaser rangingPrecision metrologyFiber couplingWavefront decompositionPartial coherence

Slide5

FREDAperture Diffraction

Plane wave source diffracting from a triangular aperture

Slide6

FREDObscuration Diffraction

Diffraction from secondary mirror struts and baffle on a Cassegrain Telescope

Slide7

FREDFiber Coupling

Fiber coupling efficiencySingle Mode Step IndexGaussian Mode

z

-position

CE

Slide8

FRED

Near Field Diffraction

Fresnel zones – Near field diffraction structure

Slide9

FREDPolarization & Birefringence

Alignment of a ruby laser with polarization filters and birefringent materials

Slide10

FREDInterferometry

Fizeau homogeneity test

Inhomogeneous material

Slide11

FREDPartial Coherence

Diffractometer

Degree of Coherence

|

12

|

Pinhole spacing (mm)

a

b

c

A

P

1

P

2

L

1

L

2

s

1

L

0

s

0

F

R

2

o

2

1

a

b

c

Slide12

FREDClosing Remarks

General propagation of coherent fields using complex rays is proven and accurate

FRED

provides engineers with a toolbox for modeling coherent systems

BASIC scripting compiler allows for custom analyses and source definitions

Capability can be expanded by linking with outside programs such as Excel,

Matlab

, and FDTD software