Browse Prior Art Database

SPLIT-ELECTRODE MODULATOR

IP.com Disclosure Number: IPCOM000024518D
Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 58K

Publishing Venue

Xerox Disclosure Journal

Abstract

The subject invention relates to a technique for improving the tracking bandwidth of an acousto-optic (A/O) modulator for ROS facet tracking applications. As shown in the figure, a typical A/O modulator 10 comprises a glass substrate 12, a ground electrode 14 overlying substrate surface 16, piezoelectric transducer 18 (typically LiNb03) and anti-reflection coatings 19 and 21. In accordance with the teachings of the invention, a split electrode configuration 20 is utilized in lieu of a standard single electrode. The split electrode 20 comprises electrodes 22 and 24 and is formed by introducing a gap in the electrode forming mask, separate gold leads being attached to each electrode. Optimum performance is obtained (i.e., tracking bandwidth increased 21 96 over the single electrode configuration) by selecting the gap g in accordance with the following relationships:

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SPLIT-ELECTRODE MODULATOR Jean-M i che 1 G ue r in
John A. Lucero

Proposed Classification
U.S. CI. 332/7.51 Int. Cl. HOls 3/00

The subject invention relates to a technique for improving the tracking bandwidth of an acousto-optic (A/O) modulator for ROS facet tracking applications. As shown in the figure, a typical A/O modulator 10 comprises a glass substrate 12, a ground electrode 14 overlying substrate surface 16, piezoelectric transducer 18 (typically LiNb03) and anti-reflection coatings 19 and 21. In accordance with the teachings of the invention, a split electrode configuration 20 is utilized in lieu of a standard single electrode. The split electrode 20 comprises electrodes 22 and 24 and is formed by introducing a gap in the electrode forming mask, separate gold leads being attached to each electrode. Optimum performance is obtained (i.e., tracking bandwidth increased 21 96 over the single electrode configuration) by selecting the gap g in accordance with the following relationships:

22

G = k gfc /2nv

2s + G = .7

GJS = 0.25

Wherein L = length of each split electrode N = index of refraction of substrate 12 V = sound speed in substrate 12
f = frequency at which to align for best Bragg deflection

= incident laser beam wavelength

C

Volume 5 Number 6 November/December 1980

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XEROX 606 DISCLOSURE JOURNAL

Volume 5 Number 6 November/December 1980

[This page contains 1 picture or other non-text object]...