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
Download Presentation The PPT/PDF document " FRED Coherence FRED : A software tool " is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
FREDCoherence
FRED
: A software tool
for modern engineering
Slide2FREDOverview
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
Slide3FREDOverview
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
Slide4FREDCapabilities
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
Slide5FREDAperture Diffraction
Plane wave source diffracting from a triangular aperture
Slide6FREDObscuration Diffraction
Diffraction from secondary mirror struts and baffle on a Cassegrain Telescope
Slide7FREDFiber Coupling
Fiber coupling efficiencySingle Mode Step IndexGaussian Mode
z
-position
CE
Slide8FRED
Near Field Diffraction
Fresnel zones – Near field diffraction structure
Slide9FREDPolarization & Birefringence
Alignment of a ruby laser with polarization filters and birefringent materials
Slide10FREDInterferometry
Fizeau homogeneity test
Inhomogeneous material
Slide11FREDPartial 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
Slide12FREDClosing 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