Abstract: A debris disposal chute includes a plurality of tubes having rectangular cross sections of a decreasing size attached together. Flaccid members are connected between hangers pivotably mounted to a casing and the first tube and between the flaccid members of the upper tube and the next lower tube. The casing is pivotably mounted to a receptacle about an axis perpendicular to the hanger axis and the center line of the chute. A header is removably connected to the receptacle by attachment bars and includes a surface inclined towards the open entry. Weight basins are removably connected to the header by leverage connectors on opposite sides of the open entry and the attachment bars.

Abstract: A roofing material bundle transport trailer includes a steering assembly and a pair of transport wheels movably supporting a frame upon a support surface. An inner end of a brake pedal grips one of a plurality of frame rollers rotatably mounted to the frame spaced from each other along a longitudinal axis. The brake pedal can be moved by pivoting a handle relative to the frame for sliding a locking pin extending through the brake pedal. A ramp is pivotably mounted to the frame between an unloading position extending to the support surface and an upright position extending away from the support surface and being removably held by a pair of locking plates pivotably mounted to the frame. Rollers are rotatably mounted to the ramp and aligned with the frame rollers.

Abstract: Achromatic phase-matching (APM) is used for efficiently multiplying the frequency of broad bandwidth light by using a nonlinear optical medium comprising a second-harmonic generation (SHG) crystal. Stationary optical elements whose configuration, properties, and arrangement have been optimized to match the dispersion characteristics of the SHG crystal to at least the second order. These elements include a plurality of prismatic elements for directing an input light beam onto the SHG crystal such that each ray wavelength is aligned to match the phase-matching angle for the crystal at each wavelength of light to at least the second order and such that every ray wavelength overlap within the crystal.

Abstract: An optical system uses a nonlinear optical medium to alter the frequency of a relatively narrow band light source tunable over a plurality of different frequencies using an optical system for passively directing light to the nonlinear medium at a correct phase matching angle. In this manner, the light from the tunable light source can be efficiently frequency-doubled or frequency-tripled without the need of moving parts. An all prism design provides a system of optimal efficiency.