Optical system for beam shaping

US10661384B2 · kind B2 · utility

Assignee

• TRUMPF LASER- UND SYSTEMTECHNIK GMBH · DE

Inventors

• Malte Kumkar · Weimar, DE
• Jonas Kleiner · Ditzingen, DE
• Daniel Grossmann · Schramberg, DE
• Daniel Flamm · Walnut Creek, US
• Myriam Kaiser · Ditzingen, DE

Key dates

• Filing date: May 18, 2017
• Grant date: May 26, 2020
• Expiry date: Mar 15, 2038

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K2103/54
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

An optical system for shaping a laser beam includes a beam shaping element configured to receive the laser beam having a transverse input intensity profile and to impose a beam shaping phase distribution onto the laser beam. The optical system further includes a near field optical element, arranged downstream of the beam shaping element at a beam shaping distance and is configured to focus the laser beam into the focus zone. The imposed phase distribution results in a virtual optical image of the elongated focus zone located before the beam shaping element. The beam shaping distance corresponds to a propagation length of the laser beam within which the imposed phase distribution transforms the transverse input intensity profile into a transverse output intensity profile at the near field optical element.