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Title: Laser focus compensating sensing and imaging device

Abstract

A laser focus compensating sensing and imaging device permits the focus of a single focal point of different frequency laser beams emanating from the same source point. In particular it allows the focusing of laser beam originating from the same laser device but having differing intensities so that a low intensity beam will not convert to a higher frequency when passing through a conversion crystal associated with the laser generating device. The laser focus compensating sensing and imaging device uses a cassegrain system to fold the lower frequency, low intensity beam back upon itself so that it will focus at the same focal point as a high intensity beam. An angular tilt compensating lens is mounted about the secondary mirror of the cassegrain system to assist in alignment. In addition cameras or CCD's are mounted with the primary mirror to sense the focused image. A convex lens is positioned co-axial with the cassegrain system on the side of the primary mirror distal of the secondary for use in aligning a target with the laser beam. A first alternate embodiment includes a cassegrain system using a series of shutters and an internally mounted dichroic mirror. A second alternate embodiment uses twomore » laser focus compensating sensing and imaging devices for aligning a moving tool with a work piece.« less

Inventors:
 [1]
  1. (Fremont, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
868908
Patent Number(s):
5241557
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
laser; focus; compensating; sensing; imaging; device; permits; single; focal; frequency; beams; emanating; source; particular; allows; focusing; beam; originating; differing; intensities; intensity; convert; passing; conversion; crystal; associated; generating; cassegrain; fold; angular; tilt; lens; mounted; secondary; mirror; assist; alignment; addition; cameras; ccd; primary; sense; focused; image; convex; positioned; co-axial; distal; aligning; target; alternate; embodiment; series; shutters; internally; dichroic; devices; moving; tool; piece; laser device; conversion crystal; primary mirror; imaging devices; convex lens; laser focus; imaging device; laser beams; laser beam; alternate embodiment; secondary mirror; frequency laser; focus compensating; compensating sensing; focused image; generating device; device permits; dichroic mirror; /372/

Citation Formats

Vann, Charles S. Laser focus compensating sensing and imaging device. United States: N. p., 1993. Web.
Vann, Charles S. Laser focus compensating sensing and imaging device. United States.
Vann, Charles S. Fri . "Laser focus compensating sensing and imaging device". United States. https://www.osti.gov/servlets/purl/868908.
@article{osti_868908,
title = {Laser focus compensating sensing and imaging device},
author = {Vann, Charles S.},
abstractNote = {A laser focus compensating sensing and imaging device permits the focus of a single focal point of different frequency laser beams emanating from the same source point. In particular it allows the focusing of laser beam originating from the same laser device but having differing intensities so that a low intensity beam will not convert to a higher frequency when passing through a conversion crystal associated with the laser generating device. The laser focus compensating sensing and imaging device uses a cassegrain system to fold the lower frequency, low intensity beam back upon itself so that it will focus at the same focal point as a high intensity beam. An angular tilt compensating lens is mounted about the secondary mirror of the cassegrain system to assist in alignment. In addition cameras or CCD's are mounted with the primary mirror to sense the focused image. A convex lens is positioned co-axial with the cassegrain system on the side of the primary mirror distal of the secondary for use in aligning a target with the laser beam. A first alternate embodiment includes a cassegrain system using a series of shutters and an internally mounted dichroic mirror. A second alternate embodiment uses two laser focus compensating sensing and imaging devices for aligning a moving tool with a work piece.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

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