... 5 Commerce Way Auburn, NY 13210 www.volpiusa.com Contents 1 2 2.1 2.2 2.3 2.4 Historical Overview Fundamentals of Light Propagation in Light Guides Total Internal Reflection Numerical Aperture of a Light Guide Guided Light Outside the Core Medium Phase Shift of Total Reflection 3 Light Guides - Modes 3.1 Mode Equation 3.2 Mode Number of a Light Guide 4 Light Intensity Distribution in a Light ... Such a light guide is referred to as a coherent fiber bundle or image bundle. ...