Massachusetts Institute of Technology

Other

Richard C Williamson

Ernest R Stern

Tso Yee Fan

Antonio Sanchez-Rubio

James N Walpole

Zong-Long Liau

James R Leger

William C Goltsos

Ivars Melngailis

Henry Ignatius Smith

Frederick J Leonberger

John H Cafarella

Abraham Bers

Arthur G Foyt

A boat misting system for cooling occupants of a boat or houseboat with a very fine aerosolized water spray is described. The water for the system is taken from the body of water upon which the boat floats so that a virtually limitless amount of misting water is available. The boat misting system is aesthetically pleasing because the plumbing components are concealed below the deck or within the hull of a boat. If desired, extension hoses may be used to equip a boat canopy with a portion of the misting system. The misting spray may be applied continuously or cycled intermittently using a timer.

Boat misting system

A smooth contoured structure is formed from a planar surface by etching mesas of equal height into the surface and heat treating the structure to mass transport material above the desired contour to fill in voids below the desired contour. In an alternate embodiment, an optical element is formed using a patterned layer of sacrificial material and thermally treating the sacrificial layer to form a precursor contour line. The line is then transformed onto a substrate and smoothed to form the optical element.

Curved surfaces formed by etching and thermal processing

Method of forming curved surfaces by etching and thermal processing

Apparatus and method for scaling solid-state devices to higher power using multiple sources each of which are separately collimated, followed by focusing of the pump radiation into gain medium colinear to laser mode using a moderated focus. A modularized system is also described.

Multiple-laser pump optical system

An electronic mixer is decribed which utilizes an optoelectronic switch formed from a semi-insulating substrate of indium phosphide doped with a deep level impurity and disposed intermediate a microstrip transmission line. One conductor of the transmission line has a small gap in its metallization. Upon illumination of the gap by laser pulses from a laser source which are absorbed near the semiconductor surface, a photo-generated electron-hole plasma forms thereby providing a conducting path across the gap. An RF signal to be mixed with a LO signal is coupled to one side of the switch. The LO signal controls the Laser source. The output of the switch is therefore the product of the RF and LO signal.

High speed optoelectronic mixer

A continuously programmable matched filter device using a piezoelectric substrate capable of propagating acoustic wave signals on a selected surface thereof and a semiconductor substrate mounted adjacent and spaced from such surface. Means are provided for altering the conductivity pattern in the semiconductor substrate in accordance with the wave form of a reference wave signal so that a representation of the reference wave is effectively stored therein. Storage of the reference is achieved with electrostatic charge by supplying a plurality of electrons in the spatial region between the substrates or by manipulating the carriers in the semiconductor material into trapping states in order to produce such altered conductivity pattern. A second signal can thereupon be propagated along the piezoelectric substrate to interact with the stored reference conductivity pattern to provide either correlation or convolution operation depending on the direction of propagation thereof along the piezoelectric surface.

Surface wave devices for processing signals

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Sudbury, MA, United States of America

Richard C Williamson