Opto-Mechanical Systems Design, Volume 2, 4th Edition

2

Large Mirror Design

Daniel Vukobratovich

CONTENTS

2.1    Introduction and Summary

2.2    Large Mirror Characteristics

2.2.1    Definitions

2.2.2    Lightweighting Configurations

2.2.3    Figure of Merit for Weight

2.2.4    Structural Figures of Merit

2.2.5    Thermal Figures of Merit

2.3    Historical Perspective

2.3.1    Speculum Metal Mirrors

2.3.2    Cast Glass Mirrors

2.3.3    Low-Expansion Mirror Materials

2.3.4    Thickness Reduction

2.3.5    Slotted-Core and Built-Up Fused Structures

2.3.6    Frit-Bonded Substrates

2.3.7    Machined Core Substrates

2.3.8    Segmented Mirrors

2.3.9    Spin-Cast Mirrors

2.4    Large Mirror Design Process

2.5    Design of Thin Mirrors

2.5.1    Thin, Flat Back Mirrors

2.5.2    Thin Meniscus Mirrors