Optical filter having dual polarization

US12208465B2 · kind B2 · utility

Assignee

• Divergent Technologies, Inc. · US

Inventors

• Darren Beckett · Corrales, US
• Martin S. Piltch · Los Alamos, US
• Scott Betts · Parker, US
• Alberto Castro · Santa Fe, US
• Kevin C. Anderson · Albuquerque, US
• Lars Jacquemetton · Santa Fe, US
• Luis Javier Aguilar · Santa Fe, US

Key dates

• Filing date: Nov 6, 2020
• Grant date: Jan 28, 2025
• Expiry date: Nov 8, 2041

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/25
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An additive manufacturing system comprises a build plane and an energy source configured to direct energy onto a work region of the build plane. An optical detector is configured to receive one or more optical signals from the work region. An optical filter is positioned between the work region and the optical detector, wherein the optical filter includes a first partially transmissive polarized filter having a first polarization axis and a second partially transmissive polarized filter having a second polarization axis. The first polarization axis is rotationally offset from the second polarization axis approximately 90 degrees. The optical filter improves the signal to noise ratio of the optical sensors.