Nichtdichroitische Dünnfilmbeschichtungen

Details

Veröffentlichungs-Nr.

EP4733817

Anmeldetag

16. Oktober 2025

Veröffentlichung

29. April 2026

Rechtsraum

EP

Abstract

A non-dichroic coating thin film structure (100), consisting of a Bragg-reflector structure (130) and a graded index layer (120), is deposited on a substrate. The Bragg-reflector structure includes several pairs of layers: each pair has a first layer (131) of a first material with a first refractive index and a quarter-wavelength thickness determined by a target wavelength, positioned adjacent to a second layer (132) of a second material with a second refractive index, having a quarter-wavelength thickness. The first refractive index is at least 0.5 higher than that of the second. Over the Bragg-reflector structure (130), a graded index layer (120) with a continuously changing refractive index is deposited, transitioning from a third refractive index to the first refractive index. The thickness of the graded index layer (120) is selected such that the reflection coefficient for light in the visible spectrum of 400-700 nanometers varies by no more than 25 percent for this wavelength range.

Anmelder

Firma

Lockheed Martin Corporation

Land

🇺🇸 USA