A polarization-aware physics-based rendering (PBR) engine uses a Mueller matrix (MM)-valued polarized bidirectional reflectance distribution function (pBRDF) as a characterization of a given material's polarized light scattering behavior. To evaluate the ability of the pBRDF to predict polarized light scattering, this work creates a validation loop between pBRDF characterization, scene renderings, and MM imaging of scenes. A conventional method for pBRDF sampling is MM imaging of spherical objects so that many scattering geometries are simultaneously captured. This pBRDF serves as input to a polarization-aware PBR engine for rendering arbitrary object shapes and illumination geometries. In this work, spheres and the components of a Cornell box are 3D-printed to create a set of shapes made of the same material. Then a validation loop is created where the pBRDF from sphere MM measurements are used for polarimetric renderings which are compared to MM images of the Cornell box. The generalization of the pBRDF is tested using different shapes for measurement or polarimetric rendering. For example, multiple surface interactions inside the Cornell box will create polarimetric effects that are not observed by measuring spheres. The pBRDF's ability to generalize varying lighting geometries and adjacency effects will be tested.
Large Aperture Mirrors (LAMs) are essential for space telescopes and ground-based observatories. The need exists in characterization of multiple modality dynamics of recently developed LAM’s membrane mirror structure. Knowledge of this dynamics is essential to LAM’s design, balancing and operational efficacy of future systems. This presentation discusses the Whole-Field Laser Doppler Vibrometer (WF-LDV) - the newly developed instrument capable of instant characterization of LAM’s vibrational spectra and full dynamic of its membrane-like mirror surface. WF-LDV allows a picometer-scale accuracy in the multi-kHz frequency band. Innovative WF-LDV design supports measurements of multiple modalities of optical metrology tailored specifically for LAM design.
Irvine Valley College was the first school in the United States to have both HeNe and Nd:YAG open-cavity laser educational kits from eLas (formerly PI miCos Campus) successfully integrated into their extensive hands-on Laser Technology program. This paper is presented from two students’ perspective, describing the students’ experiences and including comments from the professors who integrated the laser kits into the curriculum. The main benefits these laser education kits provide for both students and faculty include their specific industrial-quality design for intensive hands-on education. Students learn about laser components and the techniques required to align a laser cavity. Theses laser systems come with lesson plans and experiments that faculty may use as is, or modify to suit a particular emphasis in their curriculum. Once alignment is achieved on a repeatable basis, then many experiments can be performed successfully, such as studying laser mode structure, input current versus output power, and wavelength stability.
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