The Understanding the Atom Series

Nuclear energy is playing a vital role in the life of everyman, woman, and child in the United States today. In theyears ahead it will affect increasingly all the peoples of theearth. It is essential that all Americans gain an understandingof this vital force if they are to discharge thoughtfully theirresponsibilities as citizens and if they are to realize fully themyriad benefits that nuclear energy offers them.

The United States Atomic Energy Commission providesthis booklet to help you achieve such understanding.

Edward J. Brunenkant, Director
Division of Technical Information

UNITED STATES ATOMIC ENERGY COMMISSION

Dr. Glenn T. Seaborg, Chairman

James T. Ramey

Wilfrid E. Johnson

Dr. Clarence E. Larson

by Hal Hellman

CONTENTS

INTRODUCTION 1

THE ELECTROMAGNETIC SPECTRUM 5

RADIO WAVES 9

LIGHT AND THE ATOM 14

WHAT’S SO SPECIAL ABOUT COHERENT LIGHT? 19

CONTROLLED EMISSION 25

A LASER IS BORN 29

LASING—A NEW WORD 32

SOME INTERESTING APPLICATIONS 34

A MULTITUDE OF LASERS 42

COMMUNICATIONS 48

A LASER IN YOUR FUTURE? 52

SUGGESTED REFERENCES 53

United States Atomic Energy Commission
Division of Technical Information

Library of Congress Catalog Card Number: 68-60742
1968; 1969(rev.)

Nothing about lasers is more astonishing than their ability to produceholograms, under arrangements such as shown above. Twolaser beams (of different colors) emerge from the curtain (rear).They are optically combined (left center) and the combined beam isthen divided by prisms, mirrors and lenses so that part of it shineson the figurines (foreground) and part on the square holographi

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