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Produced by the NASA Center for Aerospace Information (CASI)

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Final Report on Contract No. 14AS B-26635

DYN,%MTC HJLOGRAPHIC STORAGE IN LITIiIUM NIOBATE

May ; 1972 Harmon Aronson

Sponsored by; National Aeronautics and Space Administration

Marshall Space Flight Center Huntsville, Alabama

Isomet Corporation 103 Bauer Drive

Oakland, New Jersey 07436

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TABLE OF CONTENTS

Section

Page

List of Tables

iii

List of Figures and Photographs

iv

Abstract

1

1.0 INTRODUCTION

2

2.0 IMAGING PROPERTIES OF PHASE, VOLUME HOLOGRAMS

4

2.1 Volume Holograms

4

2.2 Recording Volume Holograms

7

2.3 Minimum Thickness of a Volume Hologram

11

2.4 Reconstruction Efficiency

12

2.5 Bragg Angle and Angular Bandwidth

12

3.0 PHYSICAL MECHANISM OF OPTICAL RECORDING IN LiNb0 3 14

4.0 CRYSTAL GROWTH, FABRICATION, AND PROPERTIES

16

4.1 Crystal Growth and Fabrication

16

4.2 Optical Transmission

22

4.3 Index of Refraction

25

4.4 Additional Physical Properties of LiNb0 3

27

5.0 RESULTS ON HOLOGRAPHIC RECORDING IN DOPED

LiNb0 3 CRYSTALS

23

5.1 General Remarks on the Results

28

5.2 Reconstruction Efficiency

31

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TABLE OF CONTENTS

(continued)

Section

page

6.0 SUMMARY AID RECOMMENDATIONS FOR FURTHER WORD

38

7.0 REFERENCES

40

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LIST OF TABLES

Table No.

pie

1

Domed UMO 3 Crystals Grown D,.xring

Course of Contract

20

2

Index of Refraction of iUndoped LNNbO 326

3

Reconstruction Efficiency for 8mm Thick

Undoped LiNbO 331

4

Reconstruction Efficiency for Various

Doped Crystals for Constant Exposure

32

5

Reconstruction Efficiency for LiNbO 3 :Fe 33

-iii-

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LIST OF FIGURES AND PHOTOGRAPHS

Figure No.

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1

Holographic Formation and Reconstruction

8

2

Holographic Recording of Two Beams

Interference Pattern

10

3

Optical Transmission for Undoped LiNb0 323

4

Optical Transmission for Some Doped

LiNbO 3 Crystals

24

5

Experimental Setup for Holographic

Recording and readout

29

6

Reconstructed Hologram LiNbO 3 :CU36

Photograph No.

1

Czochralski Crystal Puller

17

2

Optical Setup for Storing Pictorial

Information in LiNbO 335

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ABSTRACT

A program was undertaken to improve the optical recording

properties of LiNbO 3 for holographic optical memory application. Iron, copper, and manganese doping were all found to increase

the optical selasitivity of LiNbO

3 .

Over two orders of

magnitude improvement was obtained, resulting in an exposure

of 366? J/mm to obtain 19/o efficienty in LiNbo ;3r' e. Higgh quality pictorial information was stored in lmnt diameter

holograms.

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