Customized polymer/glass diffractive waveguide stacks for augmented reality/mixed reality applications

US12189165B2 · kind B2 · utility

Assignee

• Magic Leap, Inc. · US

Inventors

• Sharad D. Bhagat · Austin, US
• Brian George Hill · Duxbury, US
• Christophe Peroz · San Francisco, US
• Chieh Chang · Cedar Park, US
• Ling Li · Hsinchu, TW

Key dates

• Filing date: Mar 16, 2023
• Grant date: Jan 7, 2025
• Expiry date: Mar 16, 2043

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B2027/0174
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A diffractive waveguide stack includes first, second, and third diffractive waveguides for guiding light in first, second, and third visible wavelength ranges, respectively. The first diffractive waveguide includes a first material having first refractive index at a selected wavelength and a first target refractive index at a midpoint of the first visible wavelength range. The second diffractive waveguide includes a second material having a second refractive index at the selected wavelength and a second target refractive index at a midpoint of the second visible wavelength range. The third diffractive waveguide includes a third material having a third refractive index at the selected wavelength and a third target refractive index at a midpoint of the third visible wavelength range. A difference between any two of the first target refractive index, the second target refractive index, and the third target refractive index is less than 0.005 at the selected wavelength.