# US 5,307,369 A · Laser beam combination system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,307,369 A - Document ID: US5307369A - Status: Granted - Kind: A - Application number: 08/066,899 - Filed: 1993-05-21 - Granted: 1994-04-26 - Earliest claimed: 1992-05-06 - Assignees: Electrox Corporation - Inventors: Dwight E. Kimberlin - Web page: https://patentgrep.com/patent/US5307369A ## CPC - H01S 3/2316: {Cascaded amplifiers} - H01S 3/07: consisting of a plurality of parts, e.g. segments (H01S3/067 takes precedence) - H01S 3/082: defining a plurality of resonators, e.g. for mode selection or suppression - H01S 3/2383: {Parallel arrangements} - H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL ## Abstract A system for combining a plurality of laser beams into a combined output beam from at least two laser sources includes the removal of conventional perpendicularly oriented output windows from each of the laser sources. Reflecting mirrors are positioned perpendicular to the optical axis at the rear of the two laser sources. A fully reflecting mirror is positioned perpendicular to the optical axis of the first laser source to reflect coherent light received from the first laser source. A beam splitter is positioned between the first laser source and the fully reflecting mirror at the intersection of the optical axes of the first and second laser source. The beam splitter directs a portion of received coherent light into a combined output beam, with the remainder being directed back to the first and second laser sources. ## Claims ### Claim 1 A common output window assembly for combining a plurality of laser beams into a combined output beam, the laser beams being produced by first and second laser sources each respectively defining an optical axis for coherent light amplification, the common output window comprising a fully reflecting mirror positioned along the optical axis of the first laser source to reflect coherent light received from the first and second laser sources back toward the laser sources, and a beam splitter position at an intersection of the optical axes of the first and second laser sources to define an unimpeded optical path between the fully reflecting mirror and the beam splitter, with the beam splitter positioned between the first laser source and the fully reflecting mirror and at an angle with respect to the optical axes of the first and second laser sources, the beam splitter reflecting coherent light from the first laser source into the combined output beam and reflecting coherent light received from the fully reflecting mirror into the second laser source. ### Claim 2 (depends on 1) The common output window assembly of claim 1 further comprising a plurality of laser sources positioned to receive coherent light of the combined output beam to further amplify the combined output beam. ### Claim 3 (depends on 1) The common output window assembly of claim 1 further comprising a third laser source positioned along the optic axis of the second laser source between the second laser source and the second reflecting mirror. ### Claim 4 (depends on 3) The common output window assembly of claim 3 further comprising a plurality of laser sources positioned to receive coherent light of the combined output beam to further amplify the combined output beam. ### Claim 5 (depends on 4) The common output window assembly of claim 4 wherein a fourth, a fifth, and a sixth laser source are positioned along the optical axis of the second laser source to receive coherent light of the combined output beam to further amplify the combined output beam, with the fourth laser source respectively amplifying output of the second and third laser source, the fifth laser source respectively amplifying the output of the first and second laser source, and the sixth laser source respectively amplifying the output of the first and third laser source. ### Claim 6 A laser beam combination system for directing a combined output beam of plurality of laser sources along a common optical axis, the system comprising a first laser source having an optical axis for coherent light amplification, a first reflecting mirror positioned perpendicular to the optical axis of the first laser source, a second laser source having an optical axis for coherent light amplification, a second reflecting mirror positioned perpendicular to the optical axis of the second laser source, a fully reflecting mirror perpendicularly positioned on the optical axis of the first laser source to reflect light back toward the first laser source along the optical axis of the first laser source, and a beam splitter for reflecting a portion of incident light, the beam splitter being positioned at an intersection of the optical axes of the first laser source and the second laser source to define an unimpeded optical path between the fully reflecting mirror and the beam splitter, with the beam splitter positioned to lie at an angle with respect to both the first and second optical axes to reflect coherent light from the first laser source into the combined output beam and also reflect coherent light received from the fully reflecting mirror into the second laser source. ### Claim 7 (depends on 6) The laser beam combination system of claim 6 further comprising a plurality of laser sources positioned to receive coherent light of the combined output beam to further amplify the combined output beam. ### Claim 8 (depends on 6) The laser beam combination system of claim 6 further comprising a third laser source positioned along the optic axis of the second laser source between the second laser source and the second reflecting mirror. ### Claim 9 (depends on 8) The laser beam combination system of claim 8 further comprising a plurality of laser sources positioned to receive coherent light of the combined output beam to further amplify the combined output beam. ### Claim 10 (depends on 9) The laser beam combination system of claim 9 wherein a fourth, a fifth, and a sixth laser source are positioned along the optical axis of the second laser source to receive coherent light of the combined output beam to further amplify the combined output beam, with the fourth laser source amplifying output of the second and third laser source, the fifth laser source amplifying the output of the first and second laser source, and the sixth laser source amplifying the output of the first and third laser source. ### Claim 11 A laser beam combination system for directing a plurality of laser beams along a common optical output axis, the system comprising a first laser source operated in a pulse mode and having an optical axis for coherent light amplification, a first reflecting mirror positioned perpendicular to the optical axis of the first laser source, a second laser source for coherent light amplification, the second laser source being operated in a pulse mode and having an optical axis coincident with the common optical output axis, with the coherent light amplification pulse occurring before or after the coherent light amplification pulse of the first laser source, a second reflecting mirror positioned perpendicular to the optical axis of the second laser source and the common optical output axis a fully reflecting mirror positioned to reflect coherent light received from the first laser source, and a beam splitter positioned between the first laser source and the fully reflecting mirror to provide an unimpeded optical path between the fully reflecting mirror and the beam splitter, the beam splitter also being situated along the optical axis of the second laser source to reflect coherent light from the first laser source along the common optical output axis and reflect coherent light received from the fully reflecting mirror into the second laser source. ### Claim 12 (depends on 11) The laser beam combination system of claim 11 further comprising a plurality of laser sources positioned to receive coherent light directed along the common optical output axis to further amplify the coherent light. ### Claim 13 (depends on 11) The laser beam combination system of claim 11 further comprising a third laser source positioned along the optic axis of the second laser source between the second laser source and the second reflecting mirror, the third laser source being operated in a pulse mode and having an optical axis coincident with the common optical output axis, with the coherent light amplification pulse occurring at the same time as the coherent light amplification pulse of one of the first and second laser sources. ### Claim 14 (depends on 13) The laser beam combination system of claim 13 further comprising a plurality of laser sources positioned to receive coherent light along the common optical axis to further amplify the coherent light. ### Claim 15 (depends on 14) The laser beam combination system of claim 14 wherein a fourth, a fifth, and a sixth laser source are positioned along the common optical axis to receive coherent light, with the fourth laser source amplifying output of the second and third laser source, the fifth laser source amplifying the output of the first and second laser source, and the sixth laser source amplifying the output of the first and third laser source.