Abstract: A ladder footing apparatus for supporting the base of a ladder, wherein the ladder is being positioned against a first wall structure at a top end of the ladder. The ladder footing apparatus includes an elongated handle having respective one and other opposed ends, a resilient pad member supported at one end of the elongated handle, the resilient pad member for engaging a second wall structure that is in opposed position to said first wall structure, and a hook member supported at the other opposed end of the elongated handle, said hook member for engaging a lower rung of the ladder.

Abstract: A method for co-registering imaging data from two imaging sources, the method comprising: scanning a subject using a depth sensor to generate depth data; identifying, in the depth data, the locations of first fiducial points and second fiducial points of the scanned subject; receiving first imaging data including the locations of the first fiducial points; generating a first transform function based on the locations of the first fiducial points in both the depth data and the first imaging data; receiving second imaging data including the locations of the second fiducial points; generating a second transform function based on the locations of the second fiducial points in both the depth data and the second imaging data; and mapping the data points in the first imaging data to the data points in the second imaging data based on the first and second transform functions.

Abstract: The present invention provides a photolithography system having a catadioptric system with a polarizing beam splitter cube. The beam splitter cube transmits light at wavelengths equal to or less than 170 nm. The polarizing beam splitter cube can image at high quality light incident over a wide range of angles and including a numeric aperture greater than 0.6. In one embodiment, the polarizing beam splitter cube comprises a pair of prisms that are made of at least a fluoride material, such as calcium fluoride, and a coating interface having at least one layer of a thin film fluoride material. Layers in a multi-layer stack can also be graded across the hypotenuse face of a prism to adjust layer thicknesses at any point so as to compensate for changes in the incidence angle of the light. In one embodiment, the prisms and coating interface are joined by optical contact.

Abstract: The present invention provides a ultraviolet (UV) polarizing beam splitter cube. The UV polarizing beam splitter cube is transmissive to light at wavelengths equal to or less than 170 nm, and for example at 157 nm. The UV polarizing beam splitter cube can image at high quality light incident over a wide range of angles and including a numeric aperture greater than 0.6, and for example at 0.75. In one embodiment, the UV polarizing beam splitter cube comprises a pair of prisms that are made of at least a fluoride material, and a coating interface having at least one layer of a thin film fluoride material. In one example implementation, a UV polarizing beam splitter cube comprises a pair of prisms that are made of at least calcium fluoride material, and a coating interface having a stack of alternating layers of thin film fluoride materials. The alternating layers of thin film fluoride materials comprise first and second fluoride materials.

Abstract: The present invention provides an ultraviolet (UV) polarizing beam splitter cube. The UV polarizing beam splitter cube is transmissive to light at wavelengths equal to or less than 170 nm and can image, at high quality, light incident over a wide range of angles and including a numeric aperture greater than 0.6. The UV polarizing beam splitter cube comprises a pair of prisms that are made of at least a fluoride material, and a coating interface having at least one layer of a thin film fluoride material. Alternating layers of thin film fluoride materials can comprise a first fluoride material having a first refractive index and a second fluoride material having a second refractive index. The first and second fluoride materials form a stack of fluoride materials having relatively high and low refractive indices such that the coating interface separates UV light into two polarized states.