FRED Coherence FRED A software tool for modern

FRED Coherence FRED: A software tool for modern engineering

FRED What is 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

FRED What is FRED? FRED can be used in virtually every step of the design process. 1. Initial proof of concept using catalog parts 2. Integration of optical and CAD designs 3. Full analysis of a virtual prototype including scatter, coatings, dispersion, absorption, volume scatter, diffraction, thermal emission, source characteristics… 4. Quickly manipulate model parameters for tolerance analyses 5. Integration with vendor catalogs for manufacturing or system debugging Overview FRED 1 2 3 4 5 Concept Design Analysis Tolerancing Manufacture

FRED What are FRED’s Capabilities? • General complex field propagation • Default source types • Plane waves, spherical waves, Gaussian TEM 00, Astigmatic Gaussian • Custom source types • Gaussian (Hermite, Laguerre Cosine, Laguerre Sine), R^n, Amplitude/Phase mask, Lambertian, Inverse Lambertian, cos^n, sin^n, Sampled • Field polarization • Ray synthesis from arbitrary field data • Spatial resampling • Diffraction: Aperture, edge, slit, etc. • Multi-mode beam simulation Capabilities • Birefringence • Interferometry • Laser ranging • Precision metrology • Fiber coupling • Wavefront decomposition • Partial coherence

FRED Plane wave source diffracting from a triangular aperture Aperture Diffraction

FRED Diffraction from secondary mirror struts and baffle on a Cassegrain Telescope Obscuration Diffraction

FRED Fiber coupling efficiency • Single Mode Step Index • Gaussian Mode Fiber Coupling CE z-position

FRED Fresnel zones – Near field diffraction structure Near Field Diffraction

FRED Alignment of a ruby laser with polarization filters and birefringent materials Polarization & Birefringence

FRED Fizeau homogeneity test Inhomogeneous material Interferometry

FRED Partial Coherence Diffractometer b a c Degree of Coherence | 12| a R 2 o F P 1 s 0 L 0 s 1 2 1 P 2 L 1 A L 2 b c Pinhole spacing (mm)

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