Spi Lasers UK Limited

Sensor Dynamics Limited

Geosensor Corporation

Other

Trumpf Laser Gmbh

Spl Lasers UK Limited

Southampton Photonics Limited

Malcolm Paul Varnham

Mikhail Nickolaos Zervas

Erhard Lothar Kluth

John Luscombe

David Neil Payne

Mikhail Nicholaos Zervas

Erhard Lothar Edgar Kluth

John L Maida

Christophe Andre Codemard

Iain Botheroyd

William Andrew Clarkson

Andrew Malinowski

Erhard Luther Edgar Kluth

Stephen John Keen

John Redvers Clowes

Louis W Erath

Michael Kevan Durkin

Andrew Thomas Harker

Lars Johan Albinsson Nilsson

Paul William Turner

Roy Lester Kutlik

Gary J Craig

Paul Martin Harrison

Fabio Ghiringhelli

Phillip Sam Bull

Charles M Crawley

Stephen Roy Norman

Jacek Tadeusz Gabzdyl

Daniel Anthony Capostagno

Erhard L E Kluth

Sam Bull

Ed Kluth

Adam Piotr Rosowski

Tara Murphy

Anthony Paul Hoult

David Gareth Parker

Stuart Wayne Woods

Apparatus for laser processing a material (), comprising a laser (), an optical fibre (), and a coupler (), wherein: the laser () is connected to the optical fibre (); the optical fibre () is a multimode optical fibre having a first optical mode () having a first mode order (), a second optical mode () having a second mode order (), and a third optical mode () having a third mode order (); the third mode order () is higher than the second mode order () which is higher than the first mode order (); the coupler () switches laser radiation propagating in the first optical mode () to laser radiation propagating in the second optical mode (); and the coupler () switches the laser radiation propagating in the second optical mode () to laser radiation propagating in the third optical mode ().

Apparatus and method for laser processing a material

An apparatus for laser processing a material including an optical fibre, at least one squeezing mechanism, and a lens. The optical fibre is a multimode optical fibre in which laser radiation propagates in a first optical mode and in a second optical mode. The squeezing mechanism includes at least one periodic surface defined by a pitch. The periodic surface is located adjacent to the optical fibre. The pitch couples the first and second optical modes together. The first optical mode is defined by a first mode order. The second optical mode is defined by a second mode order which is higher than the first mode order. The squeezing mechanism squeezes the periodic surface and optical fibre together with a squeezing force thereby coupling the first optical mode to the second optical mode.

Apparatus for optically isolating a laser () from external reflections, which apparatus comprises a mode filter () and a first optical fibre (), wherein: the first optical fibre () is a multimode optical fibre that supports a fundamental mode () and at least one higher order mode (); the mode filter () is defined by an optical attenuation which is higher for the higher order mode () than for the fundamental mode (); the mode filter () is configured to pass the fundamental mode () into the first optical fibre (); and the apparatus being characterized in that: the first optical fibre () comprises a long period grating (); and the long period grating () is defined by a period () selected to couple the fundamental mode () to the higher order mode () of the first optical fibre (); whereby if the fundamental mode () and the higher order mode () are reflected back into the first optical fibre () as back-reflected fundamental and higher order modes (), (), then the mode filter () optically attenuates the back-reflected higher order mode () more than the back-reflected fundamental mode () thereby isolating the external reflection.

Apparatus and method for optical isolation

Laser apparatus () comprising a reference source (), a reference fiber (), and at least one laser diode (), wherein the reference fiber () comprises a core () having a refractive index nand a first cladding () having a refractive index n, the first cladding () is surrounded by a second cladding () having a refractive index n, the refractive index nis greater than the refractive index n, the refractive index nis greater than the refractive index n, the laser diode () emits laser radiation () that is guided through the first cladding () of the reference fiber (), the reference source () emits reference radiation () that has a predetermined wavelength &#x3bb;(), the reference radiation () is guided through the core () of the reference fiber () to the laser diode (), and the reference radiation () that is guided through the core () of the reference fiber () to the laser diode () has a power () at the predetermined wavelength &#x3bb;(), which power is greater than an injection locking threshold of the laser diode.

Laser apparatus

Apparatus for combining laser radiation ()which apparatus comprises a seed laser (), a splitter (), a plurality of amplifier chains (), a reference amplifier chain (), detection means (). demodulator means (), and phase control means (), wherein each of the amplifier chains () comprises at least one optical amplifier (), optical radiation () emitted from the seed laser () is split into the plurality of amplifier chains () by the splitter (). amplified by the plurality of amplifier chains (), interfered, detected by the detection means (), demodulated by the demodulator means (), and a signal () indicative of path length imbalance () fed back to the phase control means (), and wherein the apparatus is characterized in that the output power emitted by each amplifier chain () is at least 50 W, the bandwidth () of the seed laser () is at least 1 GHz, and the path length difference () between each amplifier chain () and the reference amplifier chain () is less than the coherence length () of the seed laser ().

Apparatus for combining laser radiation

Apparatus for the industrial processing of a material by a fiber laser, which fiber laser emits optical radiation, the apparatus configured such that the optical radiation forms an optical power distribution on a surface of the material, including first and second optical powers which are located at respective first and second radii from a center of the optical power distribution and which are of substantially higher intensity than a third optical power which is located at a third radius from the center of the optical power distribution and which is smaller than the first and the second radii.

Apparatus for the industrial processing of a material by optical radiation

Apparatus for providing optical radiation () comprising a pump array () for providing pump radiation (), a first pump combiner (), and a waveguide (), wherein the pump radiation () from the pump array () is coupled into the waveguide () via the first pump combiner (), and wherein the waveguide () comprises a pump guide () for guiding the pump radiation (), and a gain medium () which emits the optical radiation () when it is pumped by the pump radiation ().

Apparatus for providing optical radiation

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.

Eye safe high power fibre laser

Apparatus for providing optical radiation, which apparatus comprises an optical fibre () having a core (), a first cladding () and a second cladding (), in which the first cladding () has a substantially constant diameter () in its cross-section. The first cladding () can be non-circular. Advantages include more reliable cleaving, joining and splicing.

An optical fibre including a waveguide and at least one stress applying region is described. The waveguide is defined by a numerical aperture, and the stress applying region is defined by a depressed refractive index. The optical fibre is configured such that the waveguide supports at least two polarised fundamental modes, two polarized first second-order modes, and two polarised second second-order modes. The waveguide includes comprises a gain medium. The stress applying region, the waveguide and the disposition of the gain medium are such as to provide preferential guidance to at least one of the modes at an operating wavelength.

Polarization-dependent optical fibre amplifier

A system and method for the remote measurement of physical parameters, comprising an optical fiber cable adapted to measure a physical parameter in a remote location, a conduit extending to the remote location and configured to accommodate the optical fiber cable, a cable installation mechanism configured to install the optical fiber cable through the conduit and place the optical fiber cable at the remote location, the cable installation mechanism including means for propelling a fluid along the conduit, and a seal between the optical fiber cable and the conduit.

Apparatus for the remote measurement of physical parameters

Apparatus and methods for sensing one or more physical parameters at a remote location while minimizing or eliminating contact between reservoir fluids and the like at the remote location and the sensor used to sense the physical parameters. In one example arrangement, the apparatus includes a tubing containing a communication cable and a sensor in communication with the cable, the sensor being located within the tubing proximate the remote location. The apparatus is configured to impose a barrier of a fluid between the sensor and the environment at the remote location. A fluid barrier reservoir containing the barrier fluid is also provided in some example arrangements.

Apparatus and method for enhancing remote sensor performance and utility

Methods and apparatus for the remote measurement of physical parameters are described. The apparatus includes a sensor, sensor instrumentation, a carbon coated optical fiber cable for extending between the sensor and the sensor instrumentation, a conduit for extending to a measurement location and configured to accommodate the optical fiber cable and the sensor, and a cable installing device configured to install the sensor and the optical fiber cable through the conduit and place the sensor at the measurement location. The cable installation device includes an apparatus for propelling a fluid along the conduit, such as a pump, a compressor, and the like. In the method, a sensor is installed at a measurement location by pumping the sensor and a carbon-coated optical fiber cable through a conduit, forming a seal around the cable where it enters the conduit, and connecting the cable to sensor instrumentation.

Methods and apparatus for phase angle demodulation

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Alresford, United Kingdom

Malcolm Paul Varnham