Browse Prior Art Database

Automated Beam Expander Device

IP.com Disclosure Number: IPCOM000041818D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Dickson, LD: AUTHOR

Abstract

This article describes a device for automatically adjusting a telescoping beam expander to achieve optimum laser beam collimation. The beam expander components are mounted in a fixture. The spacing can be adjusted by an electric motor under the control of a logic circuit which is sensitive to the output of the expander laser beam. When a desired spacing is achieved, the components are fixed by applying adhesive. Referring to the drawing, the beam expander includes telescoping components 10 and 12 which are mounted in fixtures 14 and 16, respectively. The lower ends of the fixtures 14 and 16 slide along a guide bar 18, while the upper ends are threaded onto worm gears 20 and 22 which can be rotated by a reversible electric motor 24.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 73% of the total text.

Page 1 of 2

Automated Beam Expander Device

This article describes a device for automatically adjusting a telescoping beam expander to achieve optimum laser beam collimation. The beam expander components are mounted in a fixture. The spacing can be adjusted by an electric motor under the control of a logic circuit which is sensitive to the output of the expander laser beam. When a desired spacing is achieved, the components are fixed by applying adhesive. Referring to the drawing, the beam expander includes telescoping components 10 and 12 which are mounted in fixtures 14 and 16, respectively. The lower ends of the fixtures 14 and 16 slide along a guide bar 18, while the upper ends are threaded onto worm gears 20 and 22 which can be rotated by a reversible electric motor 24. An output beam of a laser 26 is directed through the beam expanding components onto a condensing lens
28. The converging beam is directed through a Ronchi ruling 30 which is moved through the beam path by a translating mechanism 32. The light passing through the Ronchi ruling impinges on a photodetector 34, providing an input to an amplifier and control circuit 36. The beam expander is adjusted beginning with the components in their fully collapsed (shortest lens separation) position. The motor is energized to cause the worm gears to begin increasing the lens separation. While the lens separation is increasing, the translation mechanism 32 constantly moves the Ronchi ruling across the beam path. Detector...