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Published byGretel Scholz Modified over 6 years ago
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FRED Coherence FRED: A software tool for modern engineering
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What is FRED? FRED Overview
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
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What is FRED? FRED Overview FRED
FRED can be used in virtually every step of the design process. Initial proof of concept using catalog parts Integration of optical and CAD designs Full analysis of a virtual prototype including scatter, coatings, dispersion, absorption, volume scatter, diffraction, thermal emission, source characteristics… Quickly manipulate model parameters for tolerance analyses Integration with vendor catalogs for manufacturing or system debugging Concept 1 FRED Design 2 Analysis 3 4 Tolerancing 5 Manufacture
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FRED Capabilities What are FRED’s Capabilities?
General complex field propagation Birefringence Default source types Interferometry Plane waves, spherical waves, Gaussian TEM00, Astigmatic Gaussian Laser ranging Precision metrology Custom source types Fiber coupling Gaussian (Hermite, Laguerre, Laguerre Cosine, Laguerre Sine), R^n, Amplitude/Phase mask, Lambertian, Inverse Lambertian, cos^n, sin^n, Sampled Wavefront decomposition Partial coherence Field polarization Ray synthesis from arbitrary field data Spatial resampling Diffraction: Aperture, edge, slit, etc. Multi-mode beam simulation
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FRED Aperture Diffraction
Plane wave source diffracting from a triangular aperture
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Obscuration Diffraction
FRED Obscuration Diffraction Diffraction from secondary mirror struts and baffle on a Cassegrain Telescope
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FRED Fiber Coupling Fiber coupling efficiency Single Mode Step Index
Gaussian Mode z-position CE
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Near Field Diffraction
FRED Near Field Diffraction Fresnel zones – Near field diffraction structure
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Polarization & Birefringence
FRED Polarization & Birefringence Alignment of a ruby laser with polarization filters and birefringent materials
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FRED Interferometry Fizeau homogeneity test Inhomogeneous material
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FRED Partial Coherence a b c Diffractometer Degree of Coherence |12|
Pinhole spacing (mm) a b c A P1 P2 L1 L2 s1 L0 s0 F R 2o 21
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FRED Closing 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
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