Trumpf Laser Gmbh

Spi Lasers UK Limited

Stephen Roy Norman

David Neil Payne

Malcolm Paul Varnham

Michael Kevan Durkin

Mikhail Nickolaos Zervas

Fabio Ghiringhelli

Paul Martin Harrison

Daniel Anthony Capostagno

Jacek Tadeusz Gabzdyl

Jayanta Kumar Sahu

Louise Mary Brendan Hickey

Andy Piper

Andrew Michael Gillooly

Adam Piotr Rosowski

Tara Murphy

Malcolm Paul Vamham

A weld () between a first material () and a second material (), the first material () being a first metallic material, and the second material () being a second metallic material, the weld () has a width () between 0.5 mm and 7 mm, the weld () comprises at least one microweld (), the microweld () forms a welding pattern () defined parallel to a surface () of the first material (), and the microweld () has a characteristic feature size () of between 20 μm and 400 um.

Method for laser microwelding

In one embodiment, a photo-darkening resistant optical fiber includes a waveguide having a numerical aperture less than 0.15. The waveguide includes a core having a refractive index nand a pedestal having a refractive index n, and wherein the fiber includes a first cladding having a refractive index nsurrounding the pedestal, wherein nis greater than n, nis greater than n. The core includes silica, a concentration of alumina of between approximately 0.3 to 0.8 mole percent, a concentration of phosphate of substantially 15 mole percent, a concentration of ytterbium substantially in the range 20000 to 45000 ppm. The pedestal can include silica, phosphate and germania. The core can have substantially zero thulium dopant.

Apparatus for providing optical radiation

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Romsey, United Kingdom

Stephen Roy Norman