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Dual Water Cell

IP.com Disclosure Number: IPCOM000074014D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Girrbach, HF: AUTHOR

Abstract

Transducer distortion, which is inherent in the single water cell acoustic deflector, is overcome by the design described below. With a quartz transducer which is only for example 0.015'' thick and, therefore very fragile, used in this kind of acoustooptical device, the relatively high load represented by a vertical water column and the tapered loading in the horizontal position of the water cell cause some serious problems in deforming the transducer. This in turn sets up an acoustic wave front distortion, which reduces the diffraction efficiency. The high-power density needed to compensate for loss of diffraction efficiency causes thermal turbulence which leads to optical wave front distortion. The dual cell eliminates these problems.

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Dual Water Cell

Transducer distortion, which is inherent in the single water cell acoustic deflector, is overcome by the design described below. With a quartz transducer which is only for example 0.015'' thick and, therefore very fragile, used in this kind of acoustooptical device, the relatively high load represented by a vertical water column and the tapered loading in the horizontal position of the water cell cause some serious problems in deforming the transducer. This in turn sets up an acoustic wave front distortion, which reduces the diffraction efficiency. The high-power density needed to compensate for loss of diffraction efficiency causes thermal turbulence which leads to optical wave front distortion. The dual cell eliminates these problems.

By interconnecting the two cells the pressure is equalized and, therefore, this modulator deflector becomes independent of orientation and pressure build up at the transducer is eliminated. The dual water cell acoustic deflector can be sealed off after vacuum filling to prevent loss of water. The sealing off prevents contamination of the water cell.

The dual water cell acoustic modulator deflector can be operated in a number of modes of which three basic modes are shown below.

1) Zero order dual pass modulator mode, Figure A (Bragg). Shown is the water cell 1, mirrors 2, water cell 3, acoustic wave 4, 5, and transducer 6. The beams and beam losses are indicated.

2) Raman-Nath zero order dual pass modulator mode, Fi...