# US 12,222,517 B2 · Laser system delivering ultra-short pulses along multiple beam delivery paths > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,222,517 B2 - Document ID: US12222517B2 - Status: Granted - Kind: B2 - Application number: 18/377,969 - Filed: 2023-10-09 - Published: 2024-02-01 - Granted: 2025-02-11 - Earliest claimed: 2018-09-10 - Applicants: Matthew David Treiser - Inventors: Matthew David Treiser - Web page: https://patentgrep.com/patent/US12222517B2 ## CPC - G02B 27/09: Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for {(adapting the beam shape of a laser diode G02B19/0052; adapting the beam shape of an LED G02B19/0061; coupling into light guides using intermediate optical elements G02B6/4204; beam shaping specially adapted for lasers H01S3/005)} - G02B 27/12: operating by refraction only - A61B 5/0068: {Confocal scanning} - A61B 5/443: {Evaluating skin constituents, e.g. elastin, melanin, water} - A61B 18/203: {applying laser energy to the outside of the body} - A61F 9/008: using laser - A61F 9/00804: {Refractive treatments} - G02B 27/0025: {for optical correction, e.g. distorsion, aberration} - G02B 27/10: Beam splitting or combining systems (polarising systems G02B27/28; mixing and splitting light signals using optical waveguides G02B6/28; {beam shaping, e.g. changing the cross-sectional area, by dividing or superposing multiple light beams G02B27/0905}) - G02B 27/1093: {for use with monochromatic radiation only, e.g. devices for splitting a single laser source} - A61B 2018/00452: {Skin} - A61B 2018/00464: {Subcutaneous fat, e.g. liposuction, lipolysis} - A61B 2018/00577: {Ablation} - A61B 2018/00601: {Cutting} - A61B 2018/00642: {with feedback, i.e. closed loop control} - A61B 2018/00785: {Reflected power} - A61B 2018/20353: {Scanning in three dimensions [3D]} - A61B 2018/20553: {with special lens or reflector arrangement} - A61B 2018/208: {with multiple treatment beams not sharing a common path, e.g. non-axial or parallel} - A61F 9/0084: {Laser features or special beam parameters therefor} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract A laser system includes a laser source generating a laser beam having ultra-short pulses; a laser delivery assembly optically receiving the laser beam and comprising: a beam splitter configured to split the laser beam between a first beam delivery path and a second beam delivery path; and at least one focusing lens optically coupled to the beam splitter and configured to focus the laser beam from each of the first beam delivery path and the second beam delivery path to a focal point on a predefined plane; wherein the first beam delivery path intersects the predefined plane at a first angle, the second beam delivery path intersects the predefined plane at a second angle, and a first pulse from the first beam delivery path and a second pulse from the second beam delivery path are coincident at the focal point. ## Claims ### Claim 1 A laser system comprising: a laser source generating a laser beam comprising ultra-short pulses; a laser delivery assembly optically coupled to the laser source to receive the laser beam, the laser delivery assembly comprising: a beam splitter configured to split the laser beam between a first beam delivery path and a second beam delivery path; a first focusing lens optically coupled to the beam splitter and positioned within the first beam delivery path, the first focusing lens configured to focus the laser beam from the first beam delivery path to a focal point on a predefined plane; and a second focusing lens optically coupled to the beam splitter and positioned within the second beam delivery path, the second focusing lens configured to focus the laser beam from the second beam delivery path to the focal point on the predefined plane, the second focusing lens being further configured for focus independently relative to the focus of the first focusing lens, wherein the first beam delivery path intersects the predefined plane at a first angle, the second beam delivery path intersects the predefined plane at a second angle, and a first pulse from the first beam delivery path and a second pulse from the second beam delivery path are coincident at the focal point, and wherein the second focusing lens focuses light relative to the focus of the first focusing lens independently to provide an avoidance of laser energy excitement by the first pulse and the second pulse in at least one of: above the focal point, or above the predefined plane. ### Claim 2 (depends on 1) The laser system of claim 1, wherein the second angle is different from the first angle. ### Claim 3 (depends on 1) The laser system of claim 1, wherein the second angle is equivalent to the first angle. ### Claim 4 (depends on 1) The laser system of claim 1, wherein the first beam delivery path and the second beam delivery path have different path lengths. ### Claim 5 (depends on 1) The laser system of claim 1, wherein at least one of: the first focusing lens, or the second focusing lens, is in a path of the laser beam before the beam splitter. ### Claim 6 (depends on 1) The laser system of claim 1, wherein the beam splitter is in a path of the laser beam before at least one of: the first focusing lens, or the second focusing lens. ### Claim 7 (depends on 1) The laser system claim 1, further comprising a positioning assembly, the laser delivery assembly coupled to the positioning assembly, wherein the positioning assembly is configured to move at least one of: the laser delivery assembly, the first focusing lens, or the second focusing lens. ### Claim 8 (depends on 7) The laser system of claim 7, wherein the positioning assembly is configured to move the laser delivery assembly using at least one of: translation, or rotation. ### Claim 9 (depends on 7) The laser system of claim 7, wherein the positioning assembly is configured to move at least one of: the first focusing lens, or the second focusing lens using at least one of: translation, or rotation. ### Claim 10 (depends on 7) The laser system of claim 7, wherein the laser delivery assembly further comprises at least one mirror optically coupled to at least one of: the first focusing lens, or the second focusing lens, wherein the positioning assembly is configured to rotate the at least one mirror. ### Claim 11 (depends on 1) The laser system of claim 1, wherein the laser source comprises a tunable pulsed laser source. ### Claim 12 A method of modifying a substrate, the method comprising: generating a laser beam comprising ultra-short pulses; splitting the laser beam between a first beam delivery path and a second beam delivery path; and focusing the laser beam from each of the first beam delivery path and the second beam delivery path to a focal point on a predefined plane within the substrate, the first beam delivery path intersecting the predefined plane at a first angle, and the second beam delivery path intersecting the predefined plane at a second angle, the focusing comprising adjusting the focus of the laser beam from the second beam path independently relative to the focus of the laser beam from the first beam delivery path; wherein a first pulse from the first beam delivery path and a second pulse from the second beam delivery path are coincident at the focal point, and wherein the laser beam from the second beam delivery path focuses light relative to the focus of the laser beam from the first beam delivery path independently to provide avoidance of laser energy excitement by the first pulse and the second pulse in at least one of: above the focal point, or above the predefined plane. ### Claim 13 (depends on 12) The method of claim 12, further comprising: moving at least one of the focal point within the predefined plane and the predefined plane by moving at least one of: a first focusing lens, or a second focusing lens; and wherein the moving at least one of the focal point within the predefined plane and the predefined plane comprises at least one of: translating, or rotating, at least one of: the first focusing lens, or the second focusing lens. ### Claim 14 (depends on 12) The method of claim 12, optically coupling at least one mirror to at least one of: the first focusing lens, or the second focusing lens; and rotating, by the positioning assembly, the at least one mirror. ### Claim 15 (depends on 12) The method of claim 12, wherein the laser source comprises a tunable pulsed laser source, the method further comprising tuning the pulsed laser source. ### Claim 16 (depends on 12) The method of claim 12, wherein the second angle is different from the first angle. ### Claim 17 (depends on 12) The method of claim 12, wherein the second angle is equivalent to the first angle. ### Claim 18 (depends on 12) The method of claim 12, wherein the first beam delivery path and the second beam delivery path have different path lengths. ### Claim 19 (depends on 12) The method of claim 12, wherein the at least one focusing lens is at least one of: the first focusing lens, or the second focusing lens, is in a path of the laser beam before the beam splitter. ### Claim 20 (depends on 12) The method of claim 12, wherein the beam splitter is in a path of the laser beam before at least one of: the first focusing lens, or the second focusing lens as the at least one focusing lens.