Browse Prior Art Database

Optomechanical Devices

IP.com Disclosure Number: IPCOM000085927D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Fossheim, K: AUTHOR [+3]

Abstract

A thin rectangular slab of photoconducting, piezoelectric material, like CdS, is mounted firmly on an insulating material at one end. It's two major faces may be provided with thin metallic coatings. This photo-piezoelectric element (ppe) bends if irradiated by light. Sensitivity, defined as a curvature per light power, depends on light frequency, on the geometry of the cell, and on electrical DC bias of the sample if applied. Based on this element optomechanical devices can be built.

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Optomechanical Devices

A thin rectangular slab of photoconducting, piezoelectric material, like CdS, is mounted firmly on an insulating material at one end. It's two major faces may be provided with thin metallic coatings. This photo-piezoelectric element (ppe) bends if irradiated by light. Sensitivity, defined as a curvature per light power, depends on light frequency, on the geometry of the cell, and on electrical DC bias of the sample if applied. Based on this element optomechanical devices can be built.

Optomechanical relay. Equipped with appropriate contacts, the opto- mechanically bending crystal acts as a light-activated electrical switch.

Optomechanical oscillator and self-excited optical chopper. A light beam may bend the ppe element off its path for a short time until restoring forces straighten the element and block the light path again. Self-oscillation starts whose frequency and amplitude depend on the shape of the crystal, its elastic constants, the lifetime and distribution of the carriers inside. They therefore can be varied to a large extent. Frequencies up to some 10 kHz and amplitudes up to 100 mu m are feasible. The optical oscillator can be used as an optical chopper or deflector which might replace conventional choppers in various photometric instruments. If the arrangement is damped appropriately, the device can be used to stabilize the intensity of a light beam.

Optically excited. Connected with a suitable membrane, the piezo-electric crys...