Arrangement for aligning the light beam paths of a group of laser diodes on a common spot, especially for providing pumping light for a solid state laser

US6501781B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dieter Maurer · Pfullingen, DE
• Lars Bartelt-Berger · Oppenweiler, DE
• Heiner Hauer · Fellbach, DE
• Albrecht Kuke · Auenwald, DE
• Eberhard Moess · Murrhardt, DE

Key dates

• Filing date: Aug 11, 1999
• Grant date: Dec 31, 2002
• Expiry date: Aug 11, 2019

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S5/02255
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The arrangement focuses a combined laser beam (33) composed of individual laser beams produced by laser diodes (2) on a common spot. Prismatic reflecting bodies (7,8) are arranged in depressions (11,12) provided in a common substrate (1) between parallel rows (R1,R2; R3,R4) of the laser diodes (2). Each reflecting body (7,8) has oppositely inclined reflecting surfaces arranged on opposite sides thereof for deflection of the individual laser beams from the two adjacent rows of laser diodes. Two cylindrical lenses (9) are arranged on opposite sides of each reflecting body (7,8) between the laser diodes and the reflective surfaces to convert elliptical remote fields of the laser beams into circularly symmetric remote fields. Laterally movable focusing lenses (14) for each individual laser beam are arranged on the reflecting bodies (7,8) between the common spot and the reflecting surfaces for individual adjustment of the laser beams, whereby the combined laser beam (33) is focussed on the common spot.