Patent 10221667 was granted and assigned to Schlumberger on March, 2019 by the United States Patent and Trademark Office.
A laser cutting apparatus operable in a wellbore to form radial slots in a subterranean formation penetrated by the wellbore. The laser cutting apparatus includes a housing, a deflector disposed for rotation about an axis within the housing, and an optical member conducting a laser beam incident upon the deflector. The deflector has at least one convex surface.