Bandpass filter for light having variable lower and upper cut-off wavelengths

US11947097B2 · kind B2 · utility

Assignee

• ABBERIOR INSTRUMENTS GMBH · DE

Inventors

• Joachim Fischer · Rodgau, DE
• Matthias Henrich · Frankfurt am Main, DE
• Andreas Schoenle · Oettingen, DE
• Lars Kastrup · Göttingen, DE

Key dates

• Filing date: Apr 6, 2021
• Grant date: Apr 2, 2024
• Expiry date: Sep 21, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B21/0076
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A bandpass filter for light has variable lower and upper cut-off wavelengths. The bandpass filter comprises an areal long-pass filter defining the variable lower cut-off wavelength and an areal short-pass filter defining the variable upper cut-off wavelength. The long-pass filter has different lower cut-off wavelengths in different first area regions which follow to one another in a first direction, and the short-pass filter has different upper cut-off wavelengths in different second area regions which follow to one another in a second direction. The long-pass filter and the short-pass filter are connected in series and spatially fixed relative to one another. The first direction and the second direction are oriented crosswise to one another.