Fiber-coupled laser systems with controllable beam shapes

A laser system for controlling beam profiles, using an optical fiber comprising a core region and an outer cladding region, comprising:

• a plurality of laser sources, each laser source configured to generate a corresponding laser beam;
• a plurality of collimating lenses, each collimating lens being individually arranged at a respective position to collimate a corresponding laser beam;
• a focus lens configured to receive laser beams outputted from the plurality of collimating lenses and focus the laser beams to form at least one focused beam with a focal point in the core region or the outer cladding region of the optical fiber;
• and
• the optical fiber comprising a core region, an inner cladding region and an outer cladding region, the optical fiber configured to output a dual laser beam comprising a main beam generated from the core region and a ring beam generated from the outer cladding region, the ring beam surrounding the main beam;
• wherein each of the plurality of collimating lenses is individually arranged at a respective position to adjust a location of the focal point in the core region or the outer cladding region of the optical fiber.