Digital light path length modulation systems

US10379388B2 · kind B2 · utility

Assignee

• Avegant Corp. · US

Inventors

• Aaron Matthew Eash · San Francisco, US
• Allan Thomas Evans · Richland, US
• D. Scott Dewald · Dallas, US
• Andrew John Gross · Redwood City, US
• Eamon Han O'Connor · Emeryville, US
• Warren Cornelius Welch, III · Foster City, US

Key dates

• Filing date: Apr 19, 2017
• Grant date: Aug 13, 2019
• Expiry date: Apr 19, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B2207/117
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A system to adjust light path length comprising a digital light path length modulator, the digital light path length modulator comprising a polarization modulator to receive polarized light and to modulate a polarization of some or all of the polarized light. The system further comprising an optical path length extender (OPLE) having an entry surface and an exit surface, to direct the light entering the OPLE with a first polarization through the entry surface and along a first light path through the OPLE to exit through the exit surface, and to direct the light entering the OPLE with a second polarization through the entry surface and along a second light path through the OPLE to exit through the exit surface, the second light path through the OPLE having a light path length two or more times longer than the first light path length through the OPLE.