Patents Assigned to SPI Lasers UK Limited
  • Patent number: 9897759
    Abstract: An apparatus for combining optical radiation, wherein the apparatus comprises a bundle of input optical fibers formed of glass, a taper, and an output optical fiber, wherein the taper is fused to the output optical fiber; and the apparatus comprises at least one cladding mode stripper to strip out higher order modes that would otherwise degrade a polymer coating on at least one of the input optical fibers and the output optical fiber.
    Type: Grant
    Filed: July 18, 2016
    Date of Patent: February 20, 2018
    Assignee: SPI Lasers UK Limited
    Inventor: Iain Botheroyd
  • Patent number: 9620925
    Abstract: An optical combiner (25), comprising a bundle of input fibers (24) spliced to an output fiber (26), the output fiber having a cladding and at least one high-index portion within the cladding, such that the high index portion has a diameter substantially equal to or less than the outer diameter of the input fiber bundle at the splice point.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: April 11, 2017
    Assignee: SPI Lasers UK Limited
    Inventors: Stephen Keen, Stephen Moore, Iain Botheroyd
  • Patent number: 9533370
    Abstract: A method for laser marking an anodized metal surface (5) with a desired color, which method comprises: providing a laser (1) for emitting a laser beam (4) comprising laser pulses having a pulse energy, a pulse width, and a pulse repetition frequency; providing a scanner (2) comprising a first mirror (6) for scanning the laser beam in a first direction (8), and a second mirror (7) for scanning the laser beam in a second direction (9); providing a lens (3) for focussing the laser beam from the laser (2) onto the anodized metal surface (5) to form a spot (31) having a spot diameter and a pulse fluence; providing a controller (11) for controlling the scanner (2) with a control signal (12); marking a plurality of lines (15) separated by a hatch distance (19) on the anodized metal surface to form a desired mark (16) by scanning the scanner (2) while pulsing the laser (1); selecting a scan speed (16), the pulse repetition frequency, and the spot diameter such that the separation (18) between consecutive spots (31) d
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: January 3, 2017
    Assignee: SPI Lasers UK Limited
    Inventors: Horia Sorin Andrei, Paul Martin Harrison
  • Patent number: 9233434
    Abstract: A method of optimizing the focus of a fibers laser is described, which comprises positioning the output of a fibers laser relative to a workpiece; measuring at least a portion of back reflected radiation from the workpiece (step 52); determining an integral of this; changing the relative position of the output and the workpiece one or more times (step 54,56), each time determining an integral of values for the back-reflection, and using the integrals to determine optimum focus.
    Type: Grant
    Filed: July 19, 2011
    Date of Patent: January 12, 2016
    Assignee: SPI LASERS UK LIMITED
    Inventor: Stephen Keen
  • Publication number: 20140147694
    Abstract: A method for laser marking a metal surface (5) with a desired colour, which method comprises forming at least one first pattern (41) on the metal surface (5) with a first laser beam (42) having a first pulse fluence (43), forming at least one second pattern (51) on the metal surface with a second laser beam (52) having a second pulse fluence (53), characterized by causing the second pattern (51) to overlay the first pattern (41), arranging the first pulse fluence (43) to be at least five times greater than the second pulse fluence (53), the colour being given by the first and second pulse fluences (43, 53) and spot spacings (48) in the first and second patterns (41, 51), and selecting the first and second pulse fluences (43, 53) and the spot spacings (48) to form the desired colour.
    Type: Application
    Filed: December 12, 2012
    Publication date: May 29, 2014
    Applicant: SPI Lasers UK Limited
    Inventor: Paul Martin Harrison
  • Publication number: 20100303104
    Abstract: Apparatus comprising a source of optical radiation (15), an optical fibre (1), and an absorbing material (2), wherein; the optical fibre (1) comprises a core (37), at least one cladding (38), and an optical surface (3); the source of optical radiation (15) provides optical radiation (16) that propagates along the core (37) of the optical fibre (1), and unwanted optical radiation (14) that propagates along the cladding (38) that surrounds the core (37); and the absorbing material (2) is in contact with the optical surface (3) over a length (5) of the optical fibre (1).
    Type: Application
    Filed: January 19, 2009
    Publication date: December 2, 2010
    Applicant: SPI LASERS UK LIMITED
    Inventors: Nicolas Bennetts, Kevin Patrick Sheehan, Fei Sun
  • Publication number: 20100177797
    Abstract: Apparatus for laser processing a material (8) with optical radiation (T), which apparatus comprises a seed laser (1) pumped by a seed pump (2), an amplifier (3) pumped by an amplifier pump (4), a controller (5), and a scanner (6), wherein the controller (5) controls the seed pump (2), the amplifier pump (4) and the scanner (6) in synchronism such that optical pulses (10) emitted by the seed laser (1) are propagated through the amplifier (3) and directed to the material (8) by the scanner (6), the apparatus being characterized in that controller (5) controls the amplifier pump (4) to cause the amplifier (3) to act as an optical attenuator when the optical radiation (7) is in a first power range, and as an optical amplifier when the output power is in a second power range.
    Type: Application
    Filed: July 9, 2008
    Publication date: July 15, 2010
    Applicant: SPI LASERS UK LIMITED
    Inventors: Andrew Paul Appleyard, Duncan John William Walker, Roland Neal
  • Patent number: 7502391
    Abstract: Apparatus for providing optical radiation includes a pump source and at least one first amplifying waveguide. The first amplifying waveguide emits optical radiation in excess of 1400 nm when pumped by the pump source. In one embodiment, the pump source can include a plurality of laser diodes and a plurality of second amplifying waveguides. In this arrangement the first amplifying waveguide is pumped by the second amplifying waveguides, the second amplifying waveguides are pumped by the laser diodes, and the second amplifying waveguides are configured to improve the beam quality of radiation emitted by the laser diodes.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: March 10, 2009
    Assignee: SPI Lasers UK Limited
    Inventors: Malcolm Paul Varnham, Mikhail Nicholaos Zervas, David Neil Payne, Lars Johan Albinsson Nilsson
  • Patent number: 7421175
    Abstract: Apparatus for providing optical radiation, which apparatus comprises an optical fibre (5) having a core (3), a first cladding (1) and a second cladding (2), in which the first cladding (1) has a substantially constant diameter (9) in its cross-section. The first cladding (1) can be non-circular. Advantages include more reliable cleaving, joining and splicing.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: September 2, 2008
    Assignee: SPI Lasers UK Limited
    Inventor: Malcolm Paul Varnham