Oxford Lasers Limited

Gideon John Foster-Turner

Andrew J Kearsley

Anthony John Andrews

Graham Rutterford

Martyn Richard Huw Knowles

Andrew Ian Bell

A method of laser-drilling a hole through a workpiece, such as an injector nozzle ( ), into a cavity comprising drilling a hole ( ) through the workpiece ( ) with a laser ( ), providing a fluid having laser-barrier properties in the cavity so that, when the hole ( ) is open to the cavity, laserlight passing through the hole ( ) is incident upon the fluid whereby the workpiece ( ) across the cavity from the hole ( ) is protected from the laserlight, and arranging that the fluid does not enter the laser-drillled hole ( ) during the drilling process. Apparatus for performing the method is also described.

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Oxford, United Kingdom

Gideon John Foster-Turner