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1. WO1996005638 - LASER OSCILLATOR

Publication Number WO/1996/005638
Publication Date 22.02.1996
International Application No. PCT/JP1995/001199
International Filing Date 15.06.1995
IPC
B23K 26/06 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
06Shaping the laser beam, e.g. by masks or multi-focusing
H01S 3/00 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
CPC
B23K 26/06
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
06Shaping the laser beam, e.g. by masks or multi-focusing
B23K 26/064
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
06Shaping the laser beam, e.g. by masks or multi-focusing
064by means of optical elements, e.g. lenses, mirrors or prisms
B23K 26/0643
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
06Shaping the laser beam, e.g. by masks or multi-focusing
064by means of optical elements, e.g. lenses, mirrors or prisms
0643comprising mirrors
B23K 26/0648
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
06Shaping the laser beam, e.g. by masks or multi-focusing
064by means of optical elements, e.g. lenses, mirrors or prisms
0648comprising lenses
B23K 26/0665
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
26Working by laser beam, e.g. welding, cutting or boring
02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
06Shaping the laser beam, e.g. by masks or multi-focusing
0665by beam condensation on the workpiece, e.g. for focusing
H01S 3/0064
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
005Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
0064Anti-reflection devices, e.g. optical isolaters
Applicants
  • FANUC LTD [JP/JP]; 3580, Shibokusa Aza-Komanba Oshinomura Minamitsuru-gun Yamanashi 401-05, JP (AllExceptUS)
  • EGAWA, Akira [JP/JP]; JP (UsOnly)
Inventors
  • EGAWA, Akira; JP
Agents
  • HATTORI, Kiyoshi; Hattori Patent Office Hachioji Tohoseimei Building 9-8, Azumacho Hachioji-shi Tokyo 192, JP
Priority Data
6/18858610.08.1994JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) LASER OSCILLATOR
(FR) OSCILLATEUR LASER
Abstract
(EN)
A laser oscillator which is protected from damage due to reflection from a workpiece while maintaining its productivity. A turn-back mirror (3) is interposed between a rear mirror (2) and an output mirror (4) inside the laser oscillator. The turn-back mirror (3) has a coating, which reflects efficiently S polarized light but has low reflectivity to P polarized light. The laser beam (1) amplified between the rear mirror (2) and the output mirror (4) is outputted from the output mirror (4). The laser beam (1) outputted at this time is S polarized light (1a). The output light (1a) is converted to circular-polarized light by a 0 °C shift mirror (5) and a 1/4 wavelength phase delay mirror (6). The laser beam (1) so converted to circular-polarized light changes its direction to a vertical direction at a mirror (7) and is converged on a workpiece (9) by a condenser lens (8). A part of the laser beam (1) emitted to the workpiece (9) is reflected and returns through the outgoing route. When this reflected light is incident to the output mirror (4), it changes to P polarized light (1b) and is attenuated by the turn-back mirror (3) at the time of reflection inside the laser oscillator.
(FR)
Un oscillateur laser est protégé contre les effets néfastes de la lumière réfléchie sur la pièce usinée tout en conservant son efficacité. Un miroir intermédiaire (3) se trouve placé entre un miroir arrière (2) et un miroir de sortie (4) à l'intérieur de l'oscillateur laser. Le miroir intermédiaire (3) a un revêtement qui réfléchit efficacement la lumière polarisée S mais peu la lumière polarisée P. Le faisceau laser (1) amplifié entre le miroir arrière (2) et le miroir de sortie (4) est émis depuis le miroir de sortie (4). Le faisceau laser (1) sortant du miroir à ce moment est constitué de lumière polarisée S (1a). La lumière sortante (1a) est transformée en une lumière à polarisation circulaire par un miroir de déphasage de 0° (5) et un miroir (6) introduisant un délai de phase d'un quart d'onde. Le faisceau laser (1) ainsi converti en lumière à polarisation circulaire change de direction, laquelle devient verticale au miroir (7) et converge sur une pièce usinée (9) par l'effet d'une lentille de focalisation (8). Une partie du faisceau laser (1) émise vers la pièce usinée (9) est réfléchie et retourne par la voie de sortie. Lorsque cette lumière réfléchie arrive sur le miroir de sortie (4), elle se transforme en lumière polarisée P (1b) et elle est atténuée par le miroir intermédiaire (3) au moment de la réflexion à l'intérieur de l'oscillateur laser.
Also published as
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